"CG125" Clone

[jamrock876]

Hi all,

Joined and decided to post chronicling my journey with a "CG125" clone, variants of which are popular here on my island. Picked the bike up a few weeks back and have started on some small mods but am yet to get around to modding/tuning the engine.

https://lh3.googleusercontent.com/pw/AM-JKLUD7JRdC0Ukb68mWBFiqktLGUb2NeNVRH8kRTCEQrh5fpLjM 3TypXgV2OC8F-MmzMaoee08KTYtkhqKetOZsdQK48XowPE4dqWjhiUUZTtdHnL8 c7oQlScYcD24f_MF0jBueCjBYZEvFFJsc38nKuOE=w486-h862-no?authuser=0

Chassis is a clone of the venerable cg125, powered by what appears to be a clone of the cb150. The engine code, while not particularly helpful, identifies it as a 162fmj.

Having read through posts by jerryhawk250, megadan etc. I have decided to take the plunge and purchase a wen rotary tool, a "stage 1" cam for the crf150f - not sure if this will fit - and will be taking the plunge to disassemble and modify this little engine once I have all the tools. I will be updating here when I get started and hopefully will be able to gather a bit of information to help fill in my lack of knowledge regarding these platforms.

One thing I am uncertain about, however, what are the differences - if any - between the clone crf230-based engines and the CB clones? I have been searching for a "big bore" kit to hop up the displacement but am unable to tell the differences between parts being advertised for the crf230f and the cb250. Any pointers provided regarding this would be much appreciated. I have ordered a vernier caliper so will be able to remove the valve cover and take measurements once that gets in but would like a little more information until I get to that stage.

[jamrock876]

Been raining a bit lately, my apologies for the dirty bike.

Within a week of owning the bike I decided to customize it a bit, no point in having something that is the same as everyone else.

My main gripe with the bike was the front brake, the stock lever had too much travel and then required too much force to actually feel like I was slowing. In an attempt to remedy this I got a set of levers from another popular (locally) brand of clones, taking the opportunity to upgrade to a hydraulic clutch in the process.

https://lh3.googleusercontent.com/pw/AM-JKLUY63A6wRKB6R7fv_UQ0OabsBHQMHOa3Rj5ME2lXHeZoWVLw 8ZDflHiWNt3SykqTVYy-lngoyYdchJl2zrwj9xjabDlu0Ua_KO6LDEB2TWHWrO6uxxT_20 tPmjwd2VMVnMkZ0vUU401wCWvb5N1oMXN=w486-h862-no?authuser=0

https://lh3.googleusercontent.com/pw/AM-JKLVEBQikmI8QVBGjIevXYa6OolgDb9l--TTi90bPVn2yp1EsevkI9fFs8n0eHO8gtXVpIna3TizhrJCmiNT iknS5cf6AzzuIMH0ynBxGcmFigv5jqB4GWDhyrTXIhSdY9I3LD 3BjOVG6EYc93f-dgnB_=w958-h540-no?authuser=0

The stock muffler was also changed for an inexpensive aftermarket part as the stock muffler was a bit restrictive and too quiet for my liking.

https://lh3.googleusercontent.com/pw/AM-JKLX7o7T2pYS-umm5ynFyyOI6pUGVAk2UdBDudD9OEond7kfnN6LOEUoVarVECn Kk_JQM13auAKMSpblnkutGmV5u1WLCyU-QKFfY4OPsmziBwzxMwDV4G7ynuQz6Jl3cAajHteb0zz-c2YqqfdtW-DW5=w486-h862-no?authuser=0

With those mods the bike was a bit lean, I have since changed the main jet to a 105, leaving the stock 35 primary. Raising the needle height to the first slot helped a bit with the transient response however I need to get a bigger pilot. Sadly none of the kits I can find online have the correct primary types, the carb that I have currently - a dekni pz37 (possibly a clone) - uses taller primaries.

I think this is where the bike will stay until I get the stuff I have on order from the US to really get started on the engine mods.

[culcune]

Your photos did not show up, at least on my work computer. I will check on my home computer when I get home.

[franque]

Pictures don't work for me either. Even links to pictures on a hosting site would be an improvement.

[jamrock876]

Your photos did not show up, at least on my work computer. I will check on my home computer when I get home.

Thanks for the heads-up. Was trying to host the photos from my google photos app, seems I copied the wrong link for each.

[jamrock876]

Pictures don't work for me either. Even links to pictures on a hosting site would be an improvement.

Works for me in incognito now, please let me know if you are able to see them.

[Bruces]

I can see them ! .

[Falkon45]

They work now.

I like the mods you've done. How does the hydro clutch actuation feel compared to the cable clutch actuation?

Also, do you have access to Nibbi carbs there, or do you have to order from the US? That would be a good upgrade if you can't get your hands on a genuine Mikuni at a decent price.

[jamrock876]

They work now.

I like the mods you've done. How does the hydro clutch actuation feel compared to the cable clutch actuation?

Also, do you have access to Nibbi carbs there, or do you have to order from the US? That would be a good upgrade if you can't get your hands on a genuine Mikuni at a decent price.

Clutch action is a little stiffer but more predictable. The bike I was riding previously had this mod and I found going back to the cable clutch there was too much travel.

The only carbs readily available locally are the Dekni brand which comes stock on most of these bikes. I am looking into ordering a carb from the US but want to see what I can get playing with the jetting on this first.

My rotary tool kit should be available for pickup today, I will still be waiting on the vernier caliper before taking the plunge to disassemble the engine though. My next steps will be to port/polish the head and take measurements to possibly find a "big bore" kit that will take the bike closer to 250cc. Thankfully I am scheduled for a few days of PTO in August so will most likely wait until then to get to it.

[franque]

I'm not sure that's a CB based engine, it looks like a clone of something else Japanese, but I can't figure out what it is right now. If it's not, the parts won't work, unfortunately, and either way the cases might need to be bored to fit the 250 kit, as they use a different case spigot diameter. Could you get some pics of the right side of the engine, especially the cylinder head?

The exposed rocker arm shafts (and what appears to be a 1-piece cylinder head) are a dead giveaway it isn't Honda based, as the rocker arm pivot shafts come out on the camchain side of the cylinder head on the Honda clones. A picture of the clutch cover would help, too. Does it have a discrete oil filter?

Also, I'd keep the lever/clutch cable around, as it appears that the shaft for the clutch slave cylinder is a bit bent, it looks like a failure waiting to happen. I had a hydro clutch on a Honda NX125 that failed, but for different reasons. They don't seem to be as robust as I'd like.

[jamrock876]

I'm not sure that's a CB based engine, it looks like a clone of something else Japanese, but I can't figure out what it is right now. If it's not, the parts won't work, unfortunately, and either way the cases might need to be bored to fit the 250 kit, as they use a different case spigot diameter. Could you get some pics of the right side of the engine, especially the cylinder head?

These are a few I pictures I had taken over the weekend. I can have a better picture of the clutch cover uploaded this evening.

Left side cover:

https://lh3.googleusercontent.com/pw/AM-JKLU6v1vcldqn__UvSfGaaJmqwwdjvoUOllpiHZfkEakALezLK 8kV6pWU5dwaECvfPTYRlPdxYTvv4NoNOi9YOYLphAsvGIng0K9 ffmDQgyQC3aFYsOWhuQVj8UCHuociFjM3wzDNoqleH0-meUb4G7Zm=w524-h929-no?authuser=0

Front:
https://lh3.googleusercontent.com/pw/AM-JKLWwgByLTPKtajB7SJyE0E9XSW8sVzvaVGd0lCreVnilQ6kX8 JzO65DD9I54PqdMInKr1Nm2vHW0ZD9sHaw381VKWYgUgL8t6hV gXatVil_xBBdfN5QDxHgzHKNTHA9Cb5l55UFTUOie-4y4GHN-AQs0=w524-h929-no?authuser=0

The exposed rocker arm shafts (and what appears to be a 1-piece cylinder head) are a dead giveaway it isn't Honda based, as the rocker arm pivot shafts come out on the camchain side of the cylinder head on the Honda clones. A picture of the clutch cover would help, too. Does it have a discrete oil filter?

The cylinder head is two pieces, the split can be seen in the picture taken from the left. The head has 9 10mm bolts in total, one of which seems to be a provision for a oil return? There are 4 on the outside and then an additional 4 closer to the center which holds the cam caps.

As far as I know it does not have a discrete filter, I will have to check. It does have the mesh-style filter behind a 22mm plug on the left engine cover.

Also, I'd keep the lever/clutch cable around, as it appears that the shaft for the clutch slave cylinder is a bit bent, it looks like a failure waiting to happen. I had a hydro clutch on a Honda NX125 that failed, but for different reasons. They don't seem to be as robust as I'd like.

The clutch lever and cable are safely stored away, I know these are not that reliable but, in my experience, they tend to give ample warning before failing.

[franque]

That looks like a Daelim 150, I'm fairly certain the CB250 parts won't work.

[jamrock876]

That looks like a Daelim 150, I'm fairly certain the CB250 parts won't work.

I am not so sure, the head looks remarkably similar to the cb145 cylinder heads found on Ebay.

Clutch cover:
https://lh3.googleusercontent.com/pw/AM-JKLXb7eS_GIRD2r163wJjBMZ5vem3YSdj11qp7v65omancdUcj vLXKF4KAsUKKetDpMU-7DO5aYaWhE36F0KjGO8L2JgivonFlZm2FHsQT_cWPTC7SYW9qG ug_MFRqMsbWReZPvxcWdh9dCj_hDzGyFw6=w1651-h930-no?authuser=0

A quick google search for Daelim does not produce any images that look similar to my engine sadly. I guess I will just have to wait until I get my calipers and get a chance to lift the head to take some measurements.
Grasping at straws here. The chassis code begins with DFSPAK, I think that might suggest the bike is a rebranded Dongfang? Not sure to be honest.

[franque]

It's the same people that supply Lexmoto engines in the UK. It might not be a Daelim, but it's not CB-based. The cam cover/cylinder head are dead giveaways. Here's a link to what humanbeing (Chinese member on here) posted on another forum: http://www.mychinamoto.com/forums/showthread.php?8634

If you look at the threads I've started (not too many), one of them talks about an identical engine. It's a 156FMI if I remember correctly, but basically the same motor.

[jamrock876]

It's the same people that supply Lexmoto engines in the UK. It might not be a Daelim, but it's not CB-based. The cam cover/cylinder head are dead giveaways. Here's a link to what humanbeing (Chinese member on here) posted on another forum: http://www.mychinamoto.com/forums/showthread.php?8634

If you look at the threads I've started (not too many), one of them talks about an identical engine. It's a 156FMI if I remember correctly, but basically the same motor.

I was hoping it was CB based. Will still be taking it apart at some point to port and polish the head so I guess I will just have to take proper measurements and pictures when I get around to it. If all else fails I think I can get a CB clone locally in 250/230 form, that might be a better move.

[JerryHawk250]

I'm pretty sure that is an OHC engine. I see it has a cam chain tensioner. Lifan made something similar.

[franque]

It's definitely ohc, just not Honda based. I forgot to mention, even if it was, unless something has recently changed, they changed the stud spacing when they went over 200ccs, so even if it was Honda CB/CG based, you'd still be limited to under 200ccs unless you made a custom stroker crank.

[jamrock876]

It's definitely ohc, just not Honda based. I forgot to mention, even if it was, unless something has recently changed, they changed the stud spacing when they went over 200ccs, so even if it was Honda CB/CG based, you'd still be limited to under 200ccs unless you made a custom stroker crank.

I still have a lot to learn about these engines it seems. Was of the opinion that the bolt patterns were relatively standard with only the crank and cylinder/bore changing between the different cc ratings.

Seems on this engine I might be limited to just the porting, cam and an offeset flywheel key. The additional displacement from a bigger bore would have been nice but I also like the revvy nature of a 150 so not all is lost.

[franque]

Where did you find a cam for it? I didn't think there was much available for it.

Honda changed the bore spacing when the CRF230 came out, because otherwise they were running into the cylinder studs and oil supply (technically at least the second or third revision of these crankcases that date back to the SL/CB100 of the early 70s).

[jamrock876]

I have not received the cam as yet and so cannot say for certain that it will actually work. I went with the crf150 cam as it looked visually similar to mine. I will be testing that once it gets in, possibly before pulling the head off completely as I am unable to locate a head gasket locally.

[franque]

Yeah, I would be inclined to think that it won't work unfortunately, though I'm excited to see what you come up with!

If your cylinder head is the same as what I posted in the other thread (trying to figure out what the engine was), it appears to have three plain bearings for the cam to run on, as opposed to two roller bearings on the 03-06 CRF150F/CRF230 cams; that was the major update to that engine family, besides the increased stroke on the 230, which reminds me, apparently the stud spacing wasn't changed for the 230, just an increase in stroke.

I think for the 'clone' engines, they did increase the stud spacing, but I would have to double check.

You'll probably have to cut the bearing off of the sprocket side of the cam to make it work, and press off the bearing on the non-drive side, but even then there is the distinct probability of different measurements for the length of the cam, the diameter of the plain bearings, etc.

I would invest in a pair of calipers to double check everything, and plan on making friends with a welder/machinist if you really want to make the cam fit/work.

Another option, if you want to keep the engine, is possibly have a cam reprofiled by somebody like Webcams. I'd get a spare cam and send that to them, because if any aftermarket cams are available, they will be coming out of the UK.

I think your best bet is to get a CB or CG style engine and hot rod one of them, this way you can find parts without having to make your own (or get them custom made).

I'm along for the ride, in any case!

[jamrock876]

Yeah, I would be inclined to think that it won't work unfortunately, though I'm excited to see what you come up with!

If your cylinder head is the same as what I posted in the other thread (trying to figure out what the engine was), it appears to have three plain bearings for the cam to run on, as opposed to two roller bearings on the 03-06 CRF150F/CRF230 cams; that was the major update to that engine family, besides the increased stroke on the 230, which reminds me, apparently the stud spacing wasn't changed for the 230, just an increase in stroke.

I think for the 'clone' engines, they did increase the stud spacing, but I would have to double check.

You'll probably have to cut the bearing off of the sprocket side of the cam to make it work, and press off the bearing on the non-drive side, but even then there is the distinct probability of different measurements for the length of the cam, the diameter of the plain bearings, etc.


The cam uses two roller bearings and has a removable cam gear if I remember correctly. I had removed the cam cover to do a quick visual check before ordering. For some reason trying to remember now I cannot say if I actually verified that the gear was removable.

I was unable to check the actual spacings of the bearings and lobes as I am still waiting on my calipers to get in. Got the alert yesterday that they were delivered to my freight forwarder in Miami.


I would invest in a pair of calipers to double check everything, and plan on making friends with a welder/machinist if you really want to make the cam fit/work.

Another option, if you want to keep the engine, is possibly have a cam reprofiled by somebody like Webcams. I'd get a spare cam and send that to them, because if any aftermarket cams are available, they will be coming out of the UK.

I think your best bet is to get a CB or CG style engine and hot rod one of them, this way you can find parts without having to make your own (or get them custom made).

I'm along for the ride, in any case!

I intend to get the engine apart and actually take some proper measurements once the remainder of my tools get in. My biggest issue currently is that I am unable to source a head-gasket from the dealer and without that, I am a bit hesitant to pull the engine apart. I might get lucky and have it be MLS so I can re-use it with a slight coating of copper spray but I would have to take it apart to be sure.

My thought process currently in getting parts are that if they work for this engine great, if not I am likely to grab an engine from a crf230 clone. I think they go by the "Monster" / "Hi Rev" brand locally.

These are the only pictures I can find online which show the possible donor engine/bike. (https://www.facebook.com/marketplace/item/1844622349055290/?ref=search&referral_code=null&referral_story_type=post&tracking=browse_serp%3Ac06562ea-df04-4824-a4fe-7d9a9991482d)

[jamrock876]

The previous message by @franque had me concerned as I really could not remember if the cam gear was removable. :doh:

Curiosity got the better of me and I ended up taking the valve cover off this morning to be sure. While there I decided to snap some pics and pay more attention to details.

https://lh3.googleusercontent.com/pw/AM-JKLXWg2yJpBoCFVODZyM4a57HaYCGMleSdEEdhP0Mwnq1y8qrt CeyGhH3AWBDzW_ZVj4MJtR1h14voTqKLz3eQHImyL1ByFIugee PklylWPkKlWnkmkyXQ7KtVRlPoBIm4mTMAy49UgNU7_OS8n7e2 An5=w524-h929-no?authuser=0

As can be seen above the cam gear is actually removable :clap: , however, the third lobe that I had originally ignored is now a concern. The lobe seems to have some function in the oiling system, as it has a corresponding spring-loaded pin in the cover that lines up with the oil passages. This can be seen just above the rockers in the following image.

https://lh3.googleusercontent.com/pw/AM-JKLUAAEsagbeCpksarfX0aNNt55rsiX8C6v8c8fT6auDfMQ27l LKQauytXesUSAmb9TQtd8MFrcnd1RdbPu4WmXAh2p7ERPzoQpd bexhDFxJeqgg4PZXHXWsLxgg1a2P-HMbM8moGgozPhzek0yJTjpiq=w524-h929-no?authuser=0

Any guesses as to what this might be? My first thought was a pressure relief or some sort of splash oiling or the cam rollers. The scoring in the cam journals above is hopefully not anything I need to worry about, it doesn't catch my nails and should only really need to hold the outer race for the cam bearings. I checked the bearings to be sure and they still spin freely. One other interesting fact I found was that this engine uses head bolts instead of the seemingly more popular head studs and nuts combo.

The following are two random snaps I took of the cam, one showing the bearing size and the other showing some form of identifying mark. The TY139 designation produces results of the same - or similar - cam on aliexpress but not much else.

Edit: After more digging, it would seem the engine is a TYAN TY150 or a variant thereof. They come with a 49.5mm stroke, 62mm bore and are loosely based on the CB150. Sadly all indicators point to it having a 13mm wrist pin so there are no bigger cylinders that would readily fit. I will confirm all this when I have it apart in a few weeks however at present it seems I would be better served to purchase the 250/230 engine from the bike shown in the post above.

I was also able to tell that the undriven side bearing is a 6203Z.

https://lh3.googleusercontent.com/pw/AM-JKLWJVY_jpPjxyE7F-YWXeM-qLd4z6SsWIl3mgLf42ITxPzjxMO0XzhSACE0Gul3ZZbN0pO2fF Mw3jfDCwv6YS2uGhkTso0zP5XotC5mjZfcvRa5t6YLHP0jVBa9 L9Sh6HMK81bKOolPPKZjTAM9u6IXs=w524-h929-no?authuser=0
https://lh3.googleusercontent.com/pw/AM-JKLUzpuk-QKjAOBbNx_RDcuqXCJq5iteWha00Zhvrdl15Et-GpDElfoDPbmDhguGyKnE_-_dDqhKrMHEEK8rdVFjwYUP0fHiaGOX21aVGB_vw12OJXh_B5C5 KYaszQdFZKELdFaoIgGZTZIqnhJ6KNmP2=w524-h929-no?authuser=0

[jamrock876]

I'm pretty sure that is an OHC engine. I see it has a cam chain tensioner. Lifan made something similar.

I know it has been some time since you did your x22r but by any chance do you remember the size bearings that were on the cam? I am still in the information discovery stage and trying to gather as much information and parts for when I tear this engine apart next month.

[jamrock876]

As the date draws closer, I am starting to get cold feet on attempting to port the head. Not sure I should make my first attempt at a P&P on a head I cannot seem to find a replacement for. I have been searching aliexpress, alibaba and ebay for a potential replacement head - just in case - but have so far only been able to find cylinders.

I think I might try to get by with changing out to a cheapo pwk28 (not Nibbi sadly, I try to keep my purchases under 50USD for customs), and cam for the time being. Wondering what that would be like with the mods I have done so far.

[jamrock876]

I guess there isn't much interest in these styles of bikes :hmm:.

Nevertheless, the mods must go on. One problem that has plagued me since owning the bike was its poor headlight. The stock headlight was unfocused and seemed to bother oncoming vehicles on low and high beams while not producing much usable light. I first tried changing out the bulb for a generic H4 LED, however, that seemed to have only made the problem worst.

The solution to that problem for me was a cheap 7" LED headlight from ebay. While it was a really tight fit getting the replacement into the stock housing the results are a night/day difference.

Installed:
https://lh3.googleusercontent.com/pw/AL9nZEWvJWeatKVjzlZh2MignTGTH0BTzeg5e8qcwYt_dPrJFF yKPY-SzVmiMYST31yQILYl_vz-WtKcHDMwNRA6aK0-Wm0KNbhCoy0JS7eZP1VY_fxl1MG6wXIVAnt8CGAAO25wHkVfLK fhloblbHiXBnQe=w491-h872-no?authuser=0

Results:

I decided to turn lemons into lemonade and went with the amber lights for my drl. Had really thought the version I purchased came with the integrated turn signals.
https://lh3.googleusercontent.com/pw/AL9nZEUYtHvKIAeuT6Xt_ClnSN0IWfy1jgCTW5Il0Qn2mcoET6 o8hp1xuWoLhLfPutyeuaiXOka-J0E1thDad3I-gwG4ka3MQh2hV8xqTVa7fb1UXeM8BeDilDat6kSN9NW5bYG-9uB98V4go08tQhYUHUgf=w492-h872-no?authuser=0

Low Beam - I am really loving the defined cutoff.
https://lh3.googleusercontent.com/pw/AL9nZEXxh6wE4aJB0wWUIbtcsKrfuHwEn6M35J5kIGpbUD6VBO hpURiM4VvUq4LYVjACFy5FnslOTLQ7GvrfJN6lIbf-d7TVBNYS_CkCjTlNavi3U-WoVtLi9wr2wBmYI7TamX9to4mGodplDqbL3-5YeF0w=w492-h872-no?authuser=0

High Beam
https://lh3.googleusercontent.com/pw/AL9nZEWkc646Zvkwe082H_G7MXEmFDNUMcPcBGLisQHfCQaAZN t5rOOBL_1rTsyHYhTflfHjMgw4GoHZqnuy7gTwzu3hBc7r_hlj FJzYVxNR2OVGTPtTqb6m48xaorKhdBIFFqLVHi2fTmD_mBoRcd UnGZ3u=w492-h872-no?authuser=0


Also installed a phone holder, I travel approximately 80km daily, which really helps with music on the road.

[JerryHawk250]

Wow! those lights are bright! :tup:

[jamrock876]

Had to cancel my vacation due to teammates getting sick so decided to start playing with mods I had lined up for the "rebuild". My first attempt was the PWK28 carb, sadly the intake I purchased was incorrect so I had to improvise.

I started by cutting the flange off a stock intake and attached the carb to that using a bit of rubber hose. I then used the intake boot from a pz30 carb heated and stretched it to the 50mm required for the PWK.

Completed install:
https://lh3.googleusercontent.com/pw/AL9nZEUY5VxwO_4ouHvYQCJKiN43qsd4QyGIFZwMiGbdVsyh1M adb0gpoBcZT2hF1JyKVYxbPxWsdlYm0L-v5uTZMj-i1B3sMvmly3yiylBpECI1hPmhH_Of7ph-dOFFQnNZUK2GLVEEeYeCiAQFGxAU7pDm=w1651-h930-no?authuser=0

Sadly while the bike started and idled immediately and had good low-end torque with the new carb, it was running way too rich. I also think my makeshift intake manifold was causing issues as the fuel would puddle inside the intake making the bike unpredictable and impossible to tune.

I have since reverted these mods and ordered what I think to be the correct intake, an inexpensive kit of jets, and a short (approximately 40mm) velocity stack. I am hoping that with these I can finally get this bike to run well with the carb.

[jamrock876]

Since my last post, I have since taken things back a bit.

I eventually got the PWK carb to a point where I was comfortable running a 35 pilot with 3 turns out on the air screw, HHJ needle on the second clip from the top, and a 120 main jet. Shortly thereafter my cousin's bike started having issues, had a dropped exhaust valve which took out the piston. This caused me to reconsider constantly messing with my primary mode of transportation, especially asking this much from a little 150.

I have since removed the PWK and purchased another bike for approx USD500 that has some variant of the "RE250" CB250 clone. While the body wasn't in good condition I was able to get parts relatively cheaply and have since gotten it to a point where it is okay, just need to get the engine dialed now. After which I can continue the pursuit of power. I will post pics once I get into the teardown (hopefully today).

[jamrock876]

A question though, I have been battling an odd issue with my cousin's CG-based engine. The valves, primarily exhaust, repeatedly "get tight" or drop entirely shortly after being properly adjusted. I have checked the pushrods are straight, checked that the timing is correct and the camshaft is within spec.

This all started after the rebuild from the first dropped valve, my working theory is that it is running lean and overheating which leads to the valve stretching and or the seat receding, is this a possibility

I am aiming to have both bikes -CB250 "Hi rev" and my cousin's CG150 "zhujiang"- down today for maintenance and service and would appreciate any input provided.

[jamrock876]

A question though, I have been battling an odd issue with my cousin's CG-based engine. The valves, primarily exhaust, repeatedly "get tight" or drop entirely shortly after being properly adjusted. I have checked the pushrods are straight, checked that the timing is correct and the camshaft is within spec.

This all started after the rebuild from the first dropped valve, my working theory is that it is running lean and overheating which leads to the valve stretching and or the seat receding, is this a possibility

I am aiming to have both bikes -CB250 "Hi rev" and my cousin's CG150 "zhujiang"- down today for maintenance and service and would appreciate any input provided.

Been a while since I have been online. Issue with my cousin's bike turns out to have been a slightly bent pushrod. Bike has since been fixed and sold on to a new owner.

I am still daily-ing the "duroad" 150 but seriously considering upgrading to a Japanese 600cc. For a bit I toyed with a 250cc engine (RE250 based) but that turned out to be about as fast as my 150cc so it was sold on.

For the past 6(ish) months I have been running a pwk28 carb with a 32 pilot and 120 main. This seems to be "just what the doc ordered" for my climate conditions and has been good for the most parts, occasionally going a bit lean on the pilot in colder weather and spitting flames.

While I do have this bike though, I am still searching for a flywheel key that will work to advance timing. I don't think I will ever be able to part with this bike and am considering going the stunt route one it has retired from daily duties.