there is a lag from when I twist the throttle to when the engine starts accelerating (wrong jet size?). It also backfires a little (carbs out of sync?). It has a set of 4 into 2 pipes like I've never seen before, I'll get some pics later. It came with a Windjammer fairing and a few extra parts. I don't know anything about the history of the bike, except the guy who gave it to me got it from some guy in Michigan. I am in the process of breaking it down a little to clean and put back together. Oh yeah, one more thing, there's a lot of smoke coming out of the right pipe (cylinders 3 and 4) which I am assuming is worn or stuck rings.
Your bike has an accelerator pump diaphragm. It gives a shot of gas into all the carb throats when you twist the grip to prevent lag...when its working.
Back fire in exhaust or intake?
A compression test could also be helpful to verify mechanical integrity of each cylinder.
Probably best to do a complete and thorough tuneup to establish some normalcy. Recommended order:
Cam chain tension,
valve tappets,
sparkplugs cleaned, gapped, correct number and type. (Or new)
ignition points cleaned or replaced, gapped, and timing adjusted. Static is good, but dynamic also allows advance mechanism verification.
Air filter cleaned/renewed.
Oil & filter changed (Recommend motorcycle specific oil)
Carbs synced
Then check the head pipes for even heat across the bank (flash touch) and revisit and observe which objectionable symptoms persit.
If the compression test was good, the smoking cylinder(s) just might normalize after all the cylinders have equal adjustments to fire evenly and the rings loosen and reseat.
Enjoy the hobby!
Cheers,
