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Old 12-07-2011, 07:46 AM   #1
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Default 650i spitting and sputtering

Ok, 07 650i, set for a few months during off season. Started up and it runs like hammered u know what. Thought maybe it was the gas so I added sta-bil and it did not help. Took the air filter off and looked at the slides on the carbs, they seem to be working fine, however there is a tremendous amount of vibration when I give it throttle (normal??). This machine has always from day one been a hard starter, choke for about 45 seconds while trying to start and leave choke on for about 3 minutes until it warms up. No problem after that.

How can a machine run so good at the end of last season and so bad at the start of this season???? Belt is fine and is not in limp mode. It will run and run hard just doesn't sound very good with pop pop, spit spit and occasional small backfire thru carb(s).

Does anyone think it is just bad gas?? Should I be running 93 octane in the unit?? Any advise is appreciated. I really don't think it is the jets or valves because it is almost like it happened overnight.

Thx for lookin.
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Old 12-08-2011, 03:27 AM   #2
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Bad gas by the sounds of it , should have put the sta-bil in it when you knew you wouldnt have it running for a while in the down season . If the gas has just been sitting in the bike with no sta-bil or similar product , it can gum up your carbs . my brother in law is a small engine's/ marine mechanic and he told me last year that gas can start to go bad in as little as 2 weeks. You may have to drain the fuel and pull the carbs apart and clean them .

Im sure someone else will chime in and maybe they have another suggestion .
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Old 12-08-2011, 08:28 PM   #3
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Valve adjustment.
I would bet money on it.
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Old 12-09-2011, 05:34 AM   #4
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Quote: Originally Posted by bfgreen View Post
Valve adjustment.
I would bet money on it.

I am thinkin the same thing, after reading posts about the unit being hard to start. Anyone know a good mechanic in Central Florida??? I refuse to take it to the local ATV shop !!
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