so i got a problem that needs to be solved regarding my carbs. here it is. so when i start my bike it runs on cylinder. if i put my hand over the intake of the cylinder that isn't running it will start to back fire then run for a couple seconds. if i put my hand over the intake and leave my hand off just a crack it runs pretty good. another thing thats not right. is the cyclinder that dosen't run all the time is it sucks way more air in then the other one.
any thoughts? anyway hope you guys can understand what i'm talking about.
mmmmmm..... Very interesting. I will ponder this and if I come up with anything I'll let you know. Hopefully it doesn't take a ride to La Ronge to figure it out. Did you check for spark and fuel to the carb on the cylinder that isn't firing? oh yea is this a recent development? or has it been running on one cylinder since you got it all fired up? If one is drawing more air and assuming the inside of the engine is in decent shape the carbs may need to be synched. Okay so now I will go and ponder instead of rambling on and on here.
ReplyDeletei think it has always been like that. but the other cyclinder does fire, only after chokeing it with my hand.
ReplyDeleteOkay so my thinking is that its got to be a mixter issue of some sort. When you put your hand over the intake you've got to be reducing the amount of air allowed to flow into that cylinder and then it fires properly right. So I'm not an expert but my best guess and where I would start is to check that the butterfly valves are opening equally on both carbs and verify if they are synched by adjusting the idle speeds. The only other thing I can think of is if you've got very low compression on one cylinder maybe the carbs have been adjusted to compensate but I'm not sure what all you've done to it. If you want a compression guage I've got one.
ReplyDeleteMore pondering. If you've got a tear or hole in the diaphram in the carb the vacuum will not lift the cylinder. Which wouldn't let enough air in also making the carbs unbalanced i think so you could take off your filters and rev it up to see if one of the cylinders is not moving up or is sticking or something. Let me know what you find. I'm real interested in seeing what fixes the problem.
ReplyDeleteMixture was my first thought too. Setting the whole thing back to stock specs and then starting from there will probably give you the best chance of diagnosing the real problem and not a symptom of someone's attempted fix. Get'em back to spec, then sync, then diagnose. Definately check the compression in the mean time too.
ReplyDeleteI like the ripped diaphram theory too.
Any Luck with those carbs?
ReplyDelete