Glad to hear that you got it syncd.
One cylinder "popping"
- Thread starter josephjhaney
- Start date
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OK, more data, I am waiting on my carb sync tool to show up, but I started her up, and noticed the right rear is the one having the issue, I had the airbox off, and at idle, it would pop , and I could see the fire in the air intake of that carb, that was the only one doing it, all the rest were fine, additionally when I shut her down, there was more smoke in that air intake, where the rest were nearly smoke free.....
Does that sound like a sync issue, or perhaps a timing/valve issue?
Joe
Does that sound like a sync issue, or perhaps a timing/valve issue?
Joe
alorio1
Well-Known Member
More than likely it is a synch problem. If the butterfly is closed, no fuel is going to the cylinder and the spark is igniting oil residue. If you pull that spark plug it will probably look fouled from oil residue. With out the right amount of fuel to the cylinder it can not burn clean. If you feel that exhaust on idle it will be much cooler than the rest. You may have to replace or swap plugs to get the cylinder firing while syncing. The cylinder does not have to be firing to sync, but it is best.
The pop thru the carb is usually a lean issue....but I would completely sync all 4 carbs first before trying to adjust something. The sync just might fix it.
WOW, so I hooked up the carb sync tool and went to work tonight, BAM, all 4 were out of sync, this bike is running like freaking NEW now, well, almost. 
It's nearly synced up, but I can't get the left and right synced since it's idling at around 900-1000 and when I turn the screw it seems it's dropping below a comfortable idle. Now I just need to find the idle adjust screw, and finish up!
It's nearly synced up, but I can't get the left and right synced since it's idling at around 900-1000 and when I turn the screw it seems it's dropping below a comfortable idle. Now I just need to find the idle adjust screw, and finish up!
alorio1
Well-Known Member
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Yes, I had read that, but I didn't see the idle thumb screw on the left hand side, is it the phillips head that I can see there to the left of the balancing adjustment?
alorio1
Well-Known Member
Well, ****, that just makes FAR too much sense.
Thanks, got it, Idling much smoother at 1000 now, darkness is my enemy, so one more sync next time I have daylight and don't want to ride her, but a quick zip down the street and back feels a LOT better than it did. Very smooth idle, and responsive throttle, though I wasn't geared up, so I didn't punch her much.Joe
