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Thanks for all the advice guys... However, it turns out the problem was a bad charging rotor that was screwing up my timing and ignition.

Roger that.... You think the float adjustment thing that the guy above you mentioned has anything to do with it?

I'm aware of the fact that the mixture screw is not the only part of the carb that effects tuning it and how it runs. I just figured that since all the jets and everything else about the bike is stock that it was not the jets that came from the factory?

Why do you think she wont pull up about 3000 or 3500 with the mix screw backed out??

Hey gang, Been working on my carbs a bit: They are stock, everything is stock other than pod filters instead of airbox. Bike wouldn't really pull above 3500 rpm, so i turned the screws in a a half a turn (was at 2.5 out, turned em in to 2 out), that helped but wasn't great yet...

1983 XS650 Heritage Special: stock everything except K&N pod filters replacing the air box... pretty standard. Bike was starting to "miss" or feel like it had a rev-limiter at about 3500-4000rmp, especially in 1st and 2nd gear... rode OK (better anyway) at night, but started missing a little...

I had this same problem on my '83. Checked carbs, ignition, wires, plugs, timing, the whole 9 yards. Turned out my recently purchased alternator rotor (stator) was defective from the manufacturer. Changed that and she purred.

Ill try unplugging the regulator/rectifier tomorrow.... How about this though: Today I switched the carbs out for a set that I KNOWW is in perfect working order and it didn't change a damn thing!!! Could this be an engine problem? Valves? A loose gasket somewhere?

The tank is pretty damn clean inside and before I bought the bike (should I still clean and Kreem it? I've heard Kreem is a BS product) and the guy I bought it from put a new petcock in it, the kind with the screen I'm pretty sure.

Im pretty new to this forum and motorcycling in general. Got my first bike this year, an 83 XS650 Heritage Special. When I got the bike everything was stock and I havent done much to it. The bike wouldnt run when I bought it, then I had the carbs cleaned and rebuilt it ran wonderfully. At...

Thanks for the advice, but I dont think I made any progress today. So here's where I stand today, I switched the wires to the opposite plugs and I still have the same problem with spark; left side is weak and the bike wont reva about 2500. I by passed the entire electrical system by...

My first post here, hope you can help! I bought my first motorcycle at the start of this summer; a 1983 XS650 Heritage Special. The bike seems to be in pretty good shape, other than a few electrical problems. The bike wouldnt run when I bought it, then I had the carbs cleaned and rebuilt...