Need good solid carb advise please!

[Dodgeboydan]

Hi everyone. I'm new here, and I'm hoping you guys can point me in the right direction. My Shee is a 421, but with stock head/carbs/ports. The previous owner did the motor work, and the bike has run great, until now. I stripped it to the frame and did suspension work, and took care of worn parts. Put it back together and the right side is still running ok, but the left side has what I think are pilot issues. I did pull the bowls one at a time and checked for cleanliness. When I try to let it drop to an idle, the right side runs along fine, but the left puts the cylinder out. It's for sure a rich condition, as the plug is black and the pipe gets cold. It did not have this issue until I tore it down to redo the frame. The motor was not even opened up, except for pulling the carbs and reed cages for a fresh coat of paint. I'm trying to narrow down if it's carb or ignition. It runs great on the pipe, but as soon as you try to slow speed ride it, the left side loads up and puts the cylinder out again. Any suggestions?

[Dodgeboydan]

Forgot to add that current jetting is 30 pilots and 300 mains. Right airscrew is at 1.5 turns out, the left, well, at 3.5 out is still loading up

[Dodgeboydan]

Yes when I say stock I mean head is stock with a spacer, cylinder is stock with no porting. Carbs are synced as close as I can get them as far as the slides are concerned. The tors was eliminated by the previous owner. As far as I'm seeing, there is only ground that goes on the one vr attaching bolt? Is that correct? I did quite a bit of searching before I posted, but I'm still a little stumped.

[Dodgeboydan]

Oh and as far as the carbs being adjusted the same, the only current difference is the airscrew, which when I bring it in to 1.5 to match the other, puts that cylinder out completely. Totally dead, no intermitten fire until I wing the throttle and it clears out. Then as soon as I let it drop to idle, it goes stone dead. Wouldn't air leak cause a lean condition?

[Dodgeboydan]

Well damn that could be part of it. There's is paint between the coil itself and the frame tabs. I'll take care of that in short order. I did try changing the plugs, but to no avail

[Dodgeboydan]

I went ahead and did a resistance test on the coil. I'm showing .6 ohm on the primary, and 16k across the secondaries. I read that it should be ok. Also, if it's not a 421, then how can I tell what it is. I thought that's what +4mm stroke made it lol

[Dodgeboydan]

I went ahead and did a resistance test on the coil. I'm showing .6 ohm on the primary, and 16k across the secondaries. I read that it should be ok. Also, if it's not a 421, then how can I tell what it is. I thought that's what +4mm stroke made it lol

[camatv]

is the choke passover tube in place..  order a synch tool already  thats probably the problem.  just counting screw turns on idle screws will get you no where. 

[Deadbeat]

you could measure the stroke by putting something in the spark plug hole and marking it at the *Top Dead Centre (TDC) and *Bottom Dead Centre (BDC) of the stroke  

 

*(when the piston stops moving while the crank is still being rotated)

 

stock stroke is 54mm

[Larry's Shee]

double check carbs are clean. Oter than sync, sounds like dirty pilot. Make sure cables are in splitter corect.

[Dodgeboydan]

Thanks guys. I've got my homework cut out for me. The enrichner crossover tube is in place and isn't leaking. No air leaks I can find thus far

[oldskool]

Your displacement (cc) can easily be determined once you find out what your bore and stroke is.