Jez5241

Hi Drewps, I have stripped the carbs, blown them through with 70psi airline and set the float height. The pilot jet has 30 stamped on it, due to the airfilters and exhausts I am thinking that they might need changing to a larger size but the left cyl seems fine. I have also checked the needle height and diaphrams. I'm stumped, maybe the carbs are just worn? Jez

Can anyone out there help me? I have an XS650 with XS2 engine. I have replaced piston rings, valve stem oil seals and rebuilt the engine. It has Halco pipes and cone type air filters on it. When I start it it runs on left cyl only. When i rev it it fires on both but backfires on the right cyl and chuffs out smoke from the righ cyl. I have swapped coils, points HT leads and made sure the points gap and ignition timing is spot on, it also has new condensors. I have also replaced the plugs. When I wind the pilot scews out it gets better but not good. The carbs are clean and rubbers are sealed. HELP!