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It's unbelievable. I put the plugs back in, did the dead cylinder adjustment, started the engine up and it was nothing but smooth. It held idle perfect at 1200rpm; no back fires or popping. I took it out for a night spin, and it felt great...the best it's ever felt. I've gone 50 miles on about 1...

OK, I reset the over head, but it's wasn't off by much, and was probably with in tolerance. I did set the intake just a smidge on the tighter side of the tolerance. I checked the mixture screws, and the LB was 2 1/2 turns from a soft seat, and the RB was 3 turns from a soft seat. Here is...

Alright. I took it out for a ride this afternoon, and I was happy with it. I kept it pretty tame for the first 15 miles, then took it on the high way and opened it up. It's the first time I rode in over a year, so it was pretty exciting too. When I first started it up, the idle was crap, so I...

I forgot to mention that the carbs I bought last year came with a shorter set of springs for the slides. Tonight I took those out and put in the longer springs that I had in my original carbs, thinking that maybe it just didn't have enough spring force to return the needle to idle when I closed...

OK, It's fixed...sort of. I reset the floats to 0.86", and cleaned them up again. Then I tried taking the pilot jets out, and they were both really tough to get out. I finally got them out, and they were not in good condition. I tried soaking them in carb cleaner, but that didn't help, so I took...

Ahhhh, you are correct. These do have the black plastic floats. That makes sense now. It's too late for me to work on it now, and I promised the girl I'd take her out on the town tomorrow, so Wednesday it is...

I don't know for sure, but the guy I purchased them from said he had never touched the carb before, which I'm assuming means they are stock, so I'm guessing 42.5 pilots. The carbs came from a bike that ran in Arizona. I'm in Indiana at approximately 500 ft. altitude. Do you think it would be...

Yes I did change the float bowl gasket, but I punched out all the holes before assembling. I should also mention that this bike is a 1982 XS650, but when I rebuilt the engine I damaged one of the carbs, so I purchased a set of carbs from a guy who ran them on a 1979 XS650 that he was parting...

I screwed the idle mixture screws all the way in, and then turned them out 3/4 turns. This is how the engine sounds. When I first start it up, it goes to 4000 rpm, and as you can see I give it a few throttle twists and eventually it comes down to 1200 rpm, sits there for a while, and then climbs...

Today I took the cars off and apart. I used almost a full can of carb cleaner on them, spraying each individual part, and even putting the straw into holes and passage ways to make sure those flow freely. I also adjusted the floats, but they weren't that far off. The right float was at 0.95"...

Retired, thanks for the recommendations. I probably won't be able to get to this until later this week end. I haven't removed the pilot jets, but I did run a small piece of guitar wire through them to clean them out. I was also thinking of just buying all new jets and needles for the carbs...

you mean the overhead? I've checked and set the overhead several times.

I'm at my wits end with my engine! :banghead: I have a 1982 XS650 with BS34 carbs. I rebuilt the engine early last year (Jan 2009), but could never get it to run correctly, so it sat in my garage for a whole year. After I rebuilt the engine I couldn't get it started, so I rechecked the...