misfire

Could unsynced carbs (VERY crudely bench synced with sewing needles) be causing a misfire when the engine is cold? The right cylinder heats up really slowly compared to left, and the exhaust reeks of gas, but once it heats up the problem is completely gone, except for a slightly jumpy idle.

Hello everyone, I wanted to get your opinion on whether this bike is running on both cylinders or not. I've had a problem with this bike before where it was only firing on 1 cylinder. I know this because one side was blowing cold air out of the exhaust. The head was cold as well on that same...

First off thank you for clicking on my post to see if you can help, I really appreciate it. REALLY. So, the bike has a misfire on the left cylinder when rpms are between 1k to 2k. I have ruled out the following; Spark Plugs, Ignition Coils, Sparkplug Boots. What would you check next in...

My fellow riders, I have gone through everything (carbs cleaned, float level set, valve clearances set, carbs synched, timing and points gap set, mixture screws 3 turns out) and overall my '81 SOHC bike works fine. BUT the left muffler still pops quite substantially. I have found two tiniest...

Just finished recommissioning a 1980 UK model xs400 custom which has stood idle since 1995. Took it up for its MOT test this morning and which it passed no problems. On the way back from the tester I opened it up a little only to be rewarded with a misfire over 4000rpm up to about 7, which is...