miss fire on one cyclinder

[darren philby]

ok well just rebuilt the bike xs400sh special 2 into a cafe racer. had carbs sonic cleaned new jets, new manifolds new gaskets and seals new coils . i keep getting a misfire on the right hand pot checked for airleaks changed sparks , the pionts seam fine , no excessive spark so im presuming the condensers are fine, starts on the button no probs, messed around with the mixture all to no avail anyone have any ideas on this please.

 

[XSLeo]

I would check the points gap and timing. Maybe replace them.
Leo

 

[xschris]

Have you synced the carbs? How do the plugs look?

 

[bakeLit]

I'm currently facing the same problem, it pops mostly on deceleration and above ~1600 RPMs. Checked for air leaks, I still feel the header gasket may be the culprit? I am to replace points at the weekend as they're worn out, see what that does!

 

[darren philby]

is your misfire on the right hand cylinder ? your inscription above is almost identical to mine,although i have rebuilt engine and compression tested the cylinders and there fine, all gasket and seals brand new including points and coils.

 

[darren philby]

solved the problem of the misfire, silly really but the live hooked spade connection to the points was made inside the point , eg on the nut side , which made the connection to close to the engine body and allowing it to arc, hence misfire simple and easy to miss, its taken me three weeks to notice, although looking in the manual thats where there supposed to be, but i have a fair bit of bare wire showing , so it looks like ill have to make some new connections, but they work much better , for me ANYWAY , ON THE OUT SIDE, and no misfire