12-20-2018, 08:20 PM | #16 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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I haven't dialed my PZ30 Pumper in all the way yet, but in the cooler temps when I started my bike and ran it for a little bit, the 40 pilot worked flawlessly. I currently have a 120 main in, but I didn't get a chance to test it out before the snow fell, so no idea of how rich or lean it is with my ported head. As far as the power jet carb, the comparison would be apples to oranges. Pumpers only add additional fuel during throttle roll on. A power jet adds fuel under high load with the throttle already open. It allows for leaner jetting at lower throttle positions to help make better power while helping to prevent going too lean at wide open. It works on 4 strokes to some extent, but it was originally designed for 2 smokes, which are much more sensitive to fueling having an effect on the power curve when they go a little rich at lower Revs.
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Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124 |
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12-20-2018, 08:35 PM | #17 |
Join Date: Jan 2018
Location: Forney Texas
Posts: 498
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yes I should have stated that, I'm taking baby steps also, please let me know how the 120 does. I haven't got any real time on the 115/40 yet to see how the plug looks but the bike responds nicely, If all is good I'll step up some more. I really appreciate all you contribute to the community Dan.
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Visit me on YouTube at "Project Next"! https://www.youtube.com/channel/UC6KTCi2GVbfRDv-2XCqHhsg?view_as=subscriber 2017 Bashan Storm Keihen PZ30 Pumper Carb,115 main jet,35 pilot jet, gutted factory exhaust, Sambo Digital Speedometer,LED blinkers, H4 headlight,D.I.D X-ring chain 428,17/42 sprockets,UNI cone filter. |
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12-20-2018, 09:08 PM | #18 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Quote:
Just out of curiosity, where are you sitting with the needle adjustment? Part of the reason his may have run better than yours would be the needle position. Since the main jet really only comes into play in the last quarter turn of the throttle, the needle was likely playing a bigger role in why his setup seemed to run better. You could experiment by moving the clip up (leaner) or down (richer) and see how it changes. Short of a wideband readout, the only way to judge the plug on the main jet is to do a wide open throttle plug chop on a decently long run. Once you have determined what the ideal main jet size is, then adjust the needle accordingly. Just keep in mind that it is hard to fully compare two different setups. The best way to get your own carb dialed in is to find what main jet works best for your bike. I will personally favor a slightly rich WOT on an air cooled engine without fail.
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Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124 |
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12-20-2018, 09:58 PM | #19 |
Join Date: Jan 2018
Location: Forney Texas
Posts: 498
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I'm fairly sure it is at one position up, I have not needed to move it at all. now I want to go pull the slide to verify. His isn't running better at idle though, he has full range on the same exhaust setup without any pop or backfire so I raised mine more and it helped.
I expected to have it fall on it's face at full throttle and even be stubborn down low at idle with the jet increase on both main and pilot, The only difference I've found is it needs a bit of a warm up. I can't force it to wrap out without half choking at cold start like before while leaner. Once she is warm I have full range without the pops I suffered from earlier. I know you have more aggressive flow with the ported intake and exhaust so I'm curious to see where you land. I truly wasn't expecting that big of a jet increase to work on my bike ..somehow it did.
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Visit me on YouTube at "Project Next"! https://www.youtube.com/channel/UC6KTCi2GVbfRDv-2XCqHhsg?view_as=subscriber 2017 Bashan Storm Keihen PZ30 Pumper Carb,115 main jet,35 pilot jet, gutted factory exhaust, Sambo Digital Speedometer,LED blinkers, H4 headlight,D.I.D X-ring chain 428,17/42 sprockets,UNI cone filter. |
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12-21-2018, 05:11 PM | #20 | |
Join Date: Jun 2016
Location: akwesasne, NY-13655
Posts: 2,220
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Quote:
Last edited by Ariel Red Hunter; 12-21-2018 at 05:47 PM. |
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12-23-2018, 01:28 AM | #21 |
Join Date: Jun 2016
Location: Hell
Posts: 2,408
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Anyone thought or set up an EFI on these motors?
There are kits etc |
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12-23-2018, 07:08 AM | #22 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Quote:
There is one kit that is reasonably affordable that at least 4 or 5 of us have been genuinely interested in, but the track record for one member that used it was spotty, and the quality/reliability of the parts are unproven. The one complete kit out there that has a decent track record (Ecotrons) is nearly half the price of the bikes it would be installed on. We are a somewhat thrifty bunch, and a $25 carburetor and maybe another $20 in jets can provide a simple and reliable means of power. Plus, if enough time and effort is taken, the fuel economy is rather reasonable as well. I had my last Hawk dialed in well enough to hit a 75mph top speed with my linebacker sized butt in the seat all while being more than capable of averaging over 60mpg my with fairly heavy handed riding style.
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12-23-2018, 06:29 PM | #23 |
Join Date: Jun 2016
Location: Hell
Posts: 2,408
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I have seen a few kit and yeah getting around $300 and tho EFI would be great I think it gets complicated real quick.
I am still thinking that there might be an easier way to sell a carb with jets from China but of course spending hours to make a kit happen that people don't like or want kinda gets to be pointless. I will keep looking at what people want need tho n see if I can't put things together and sell to reduce the headaches - time will tell. |
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04-18-2019, 01:10 PM | #24 | |
Join Date: Apr 2019
Location: South of Pittsburgh PA
Posts: 69
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You stated vm28...but we were talking about the vm26 - 30mm carb. Is this the correct info for the knock off vm26? TY |
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04-18-2019, 07:50 PM | #25 | |
Join Date: Jun 2016
Location: Hell
Posts: 2,408
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Worth looking at and selling a lot of these starter kits |
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04-18-2019, 08:58 PM | #26 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Quote:
The pilot jet used by the knock off Mikuni VM26 is a VM28/486 style jet. Don't let it confuse you too much. It's just the same style pilot jet the VM28 happens to use, but since these are knock off carbs, they just happened to decide to use that jet style.
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04-19-2019, 10:53 AM | #27 | |
Join Date: Mar 2010
Location: Volcano, Ca
Posts: 7,112
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Quote:
DJ, I run the "Mikuni VM26 30mm" in the link....though they come with an additional kit now too! Never had a problem with them. https://www.amazon.com/Mikuni-Carbur.../dp/B07CN36W65
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"Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350 |
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04-19-2019, 11:28 AM | #28 |
Join Date: Sep 2018
Posts: 173
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I'm curious.. Why are people worried about the better EFI kit being half the order-cost of the bike itself when you eat 2/3 the cost the second you order the bike in the first place? A mint or even heavily modded&mint Hawk or Magician gets nothing but sub $500.00 offers on CraigsList and Facebook-Marketplace..
It actually makes more sense to keep one and properly set it up than to sale or part it out. Best case scenario parts appreciate a year or two from now when plastics and electronics disappear from Shenzhen markets, or a neighbor just buys it off of you on a whim.. Also as a reminder: If it's got a 48mm stud intake and switch-choke it's not a real Mikuni. Even if it says Mikuni on the stem and Japan by the bowl(this actually exists on Amazon under a China seller even though it's a trademark violation). |
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04-19-2019, 01:27 PM | #29 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Quote:
Why not spend the $700 on the Ecotrons kit? Because it's more complex and requires more work than a simple $50 expenditure in a carburetor and some jets. I have nearly pulled the trigger multiple times on the Ecotrons kit, but it really isn't that necessary, and the benefits just don't seem worth it to me at least. The same can be said of the cheap EFI kits on Aliexpress as well, and they add even more potential issues into the mix. As far as the genuine Mikuni thing... If you take notice of the posts in the thread you will see it being called a clone or knock off carb. No idea who you are trying to tell this to?
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04-20-2019, 01:46 PM | #30 | |
Join Date: Sep 2018
Posts: 173
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