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Old 11-05-2012, 07:55 PM   #94
Beamer Bum
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Joined: Dec 2010
Location: Between Rides
Oddometer: 273
I've been following this with interest and now have to put my 2 cents in. If the bike runs good for 20 minutes before it starts acting up, you either have a heat issue like an overheating coil or, like Headtube suggested, your tank isn't venting to atmosphere. When it starts running crappy, open the fuel cap. If the tank develops a vacuum, you won't get fuel to the carbs. If you can hear the air rush in when you open the cap, it isn't venting. I think I saw you have new coils, so my guess (only a guess since I'm not there) is tank venting.

Don't worry with the collective wisdom here, you WILL get this sorted.
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