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Old 08-12-2008, 08:41 PM   #1
adub
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Still running rough

Bike is an 03 Vstar 650 9500 miles, picked it up a couple weeks ago. Ran fine til I replaced plugs and fuel filter. Now it won't idle well and runs rough especially at low rpms. I pulled carbs and cleaned them, but I didn't disassemble them. Just blew out the ports. Also did the valve adjustment. Front intake was a tad loose, all others were within spec. Ran much better after that work, however after sitting for two days it runs rougher than ever. Front plug is fouling.

Guess this means the carbs need to be disassembled?
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Old 08-12-2008, 08:50 PM   #2
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Carbs are more complicated them some realize. I'd recommend taking it to someone experienced such as Motorcycles Unlimited.

Im a BMW tech and honestly, I could follow a repair manual but there isn't any substitution for experience.
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Old 08-12-2008, 08:52 PM   #3
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I rebuilt the carbs succesfully on my old jet skis, but these are definitely much more involved.
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Old 08-12-2008, 08:54 PM   #4
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don't know where you're located, but if i'm closer than Motorcycles Unlimited i'll take a look at them....but those guys definately know their sh*t!

what's the inside of the fuel tank look like?....
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Old 08-12-2008, 08:57 PM   #5
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Im no where near Sealy, but thanks for the offer. Inside the tank looks normal. Previous owner used the bike to go to work 20 miles one way a couple days a week
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Old 08-12-2008, 09:00 PM   #6
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did you take the bowls off of the carbs? if so did you notice anything (sediment, etc.) in the bottom? i only say this because you said it ran great after you blew the carbs out and now its crappy again....that would lead me to believe you blew something out and then it sucked it back in.....also, have you messed with the valve timing at all? notice any backfiring when it's running rough? if so, is it backfiring through the carbs or exhaust?
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Old 08-12-2008, 09:37 PM   #7
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I fully believe its sediment causing the float to stick. The fuel filter I pulled off was nasty inside. I didn't open the carbs at all. All the carb parts appeared to use gaskets and I had no new ones.

It has backfired through the exhaust a couple times. Haven't touched any timing, not aware the valve timing is adjustable on this bike.
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