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Join Date: Nov 2007
Location: Chandler, Arizona
Depending on how bad they are, filling them with Seafoam and letting them soak for a while can work. When you put the Seafoam in, try to start the bike. It probably won't run, but it should fire a few times and make some smoke. This actually uses engine vacuum to suck Seafoam up into the jets.
If you remove and separate the carbs, theyshould be re synchronized, especially if they haven't been since you got the bike. When I had my carbs off to rejet after installing an aftermarket exhaust, I synchronized them. But when I had them off again to rejet again after going back to the stock exhaust (expensive lesson learned) I just checked the throttle plates before I separated them, both were completely closed, both held WD-40, so I know one was not a tiny bit more open than the other. I just put them back that way, and it ran fine. Both throttle plates in exactly the same position is where they should be, if both cylinders are the same. But if one cylinder has less compression than the other by a noticeable amount, it will also have less vacuum, and the carbs need to be set to compensate for that. I have a Motion Pro mercury synchronizer I bought about 15 years ago, brand new, for less than half what they go for today.
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike