First ride on Apollo 250 Deluxe
Well that didn't go so good, it ran really good for about 2 minutes then it wanted to die thankfully I stayed close to home. I got it restarted and had to really work the throttle to get back. I parked it in the garage to let it cool down some, about 15 minutes then started it to see how it would idle. Just like my short ride it idled perfect, for about 90 seconds then died. Started it again and like my ride I had to work the throttle to keep it running but this time I noticed it missing really bad and making kind of a backfiring sound so I shut it down.
I'm open to any and all advice, tips or tricks. I think the first thing I'd like to do is replace the carb with the Mikuni from what I've read it sounds like a good choice. That is in advance, Dean |
Choke on or off ?
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How about the fuel pet cock?
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I would get the bike running acceptably as stock before I start throwing parts at it. I had to adjust my idle screw a bit to get it to idle. Remember, these are "old school" and you're going to have to sit with it and massage the throttle for a while to warm them up before you go for a ride.
I'd also pop some octane boost in the tank. |
The choke and gas were in they're correct positions. What's strange is it idles fine until it warms up. I did put the NGK plug in it but I'm not sure of what the gap should be.
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Another question, how in heck do you get to the idle screw? That is it on the right side right behind the frame?
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Agree on the valve check. Mine were tight as a drum, no clearance at all on both intake and exhaust. I adjusted them before I even fired the bike up. I also put an NGK Iridium plug in the bike. Yeah, the stock carb is funky and jetted super lean, but it will idle now.
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With today being another beautiful one here in the Pacific northwest I thought I'd try starting the Apollo after ending yesterday with it not wanting to start at all. I changed the plug back to the one it came with in it from the NGK they included with the bike. And what do you know, it started. I set the idle up a bit then let it run to see if it was going to do what it did after it warmed up yesterday and it did, it died. I could sure us some help trouble shooting this thing if anyone gets the time.
Thanks again, Dean |
Buy one of these...
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They sell a fancier adjustor for $35 or so that lets you adjust more easily. But the small knob style works fine, you just have to turn the knob with a screw driver end. https://tboltusa.com/store/flex-jet-p-1063.html Also can get the knob type on Amazon for $8...free shipping. https://www.amazon.com/your-orders/p...ntId=DkVqqkG2d This is for a Mikuni VM26-flange mount (like on most 250 China bikes). Turn the Pilot Jet Screw "in" (CW) till it just stops. Turn 1-1/4 turn "out" on the screw, then turn out (or in) 1/4 turn increments. Have someone with you to keep the bike running while you turn the jet out (or in). Turning "out" (CCW) increases your fuel into the Pilot Jet since this is on the engine side of the carb (if the Pilot screw is on the intake side, as with other carbs such as the VM26-606, then turning out increases air). Do this until you get a good idle. If you get past 2 turns out, then you should consider a larger Pilot Jet. If you have to turn "in" (CW) to make more lean (under 1 turn) then you need a smaller Pilot Jet. Order a couple jets (either larger or smaller depending on what you find)..I had to go from a 20 stock to a 30 to get mine to idle at 1-1/4 turns, 1500 rpm. Once you get idle, then run at mid-throttle for a few miles (5-10) without stopping (much). Check your plug. Decide if rich (black) or lean (white). If tan, then OK. If black, then move the needle clip up one notch to lean out. If white, then move needle clip down one notch to richen. Do the spark plug check again. Look for Tan. Find somewhere you can run full out for 10 miles. Pull over, remove spark plug. (I didn't shut the engine off at speed and coast to a stop like some folks say...I just needed to be close enough and I don't think going to idle for 30 seconds will change the plug much) Black/Tan/white? Go up or down one Main depending on color. Because I am at a Mile High, I ended up with the 100 Main that was stock (would likely be lean at sea level). This process worked for me on my RXB150, that came with the "real" Mikuni. Tan plug all the time. Jetsrus.com: Mains: Mikuni N100.604 (Jetsrus # M21), Pilot: Mikuni VM28/486 (Jetsrus # M24). I get my jets from them in 2 days. They are about $5 each for the aftermarket type and $7 for the genuine Mikuni. Followed the same procedure when I put a VM26-606 on the TT250. I am down to where I am going to try one Main larger, as I got tan, but still a bit too white I think. I thought with this carb I would avoid the problem of the Pilot Jet Screw location (as with the PWK28 I was replacing it was accessible), but it ends up being the frame. Luckily, with a spigot mount carb it isn't a big deal (time wise) to remove the carb and tweak. |
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Go to CSC and look over the Valve adjustment for the TT250
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https://www.cscmotorcycles.com/check...lve-adjustment I don't think it is any different for any CG engine bike. They recommend "looser" gaps than most on this site do, at .07mm for both. I only had a .06mm and .08mm, so I set at .06 and made sure a .08 didn't fit. I set, rotated 2 times, checked (had to reset exhaust), rotated 2 times, checked (had to reset intake), rotated 2 times...then it was OK. Unlike the tutorial, I didn't take off my seat or gas tank. I only removed the right side plastic. My tank plastics are already off, so someone who has them might have to remove the right side only. For the TT250, the valve cover comes off easily to the right side. |
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I will be calling Orion tomorrow to give them a piece of my mind. I was also wondering about air/fuel mixture and elevation of which I'm only about 250 ft. Thanks again |
CSC plug gap
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Also, you really should check out the maintenance manual for the TT250. Most of this stuff applies to all of these Chinese 250's. You will be able to tell what doesn't. It is better than the "nothing" that is supplied by most sellers. https://www.cscmotorcycles.com/fckim...e%20Manual.pdf |
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Just a heads up for Apollo owners, there are a few things that are different than the tutorial says. Nothing major but one that sticks out is the left crank case cover on the Apollo doesn't have the 3 Phillip's head screws it has 2 flat head "plugs" that you use instead. |
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I rode mine for the first time earlier today. I noticed that I had to use about half choke to get the bike to run good, even when warmed up. Give that a try. Gotta remember that these carbs are not optimal. I will be investing in a new carb soon.
Hope this helps |
All my CB's have come super lean out of box, but not so lean I had to use the choke! Wow....
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