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Running Lean (Read 75 times)
nedelden
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Running Lean
10/15/17 at 14:53:54
 
Engine runs rough, missing, but with choke engaged the engine runs smoothly.  What is the resolution?
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Dave
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Re: Running Lean
Reply #1 - 10/15/17 at 15:06:57
 
Most likely you have something plugging up the jet(s).

Clean the carb.

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norm92de
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Re: Running Lean
Reply #2 - 10/15/17 at 15:09:45
 
Nedelden,
Is it only when idling or when riding?
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2014 S40. Raptor. idle mixture adj.Needle raised one notch. 4000' altitude. Stock jets. Shell Rotella synthetic.
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justin_o_guy2
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Re: Running Lean
Reply #3 - 10/15/17 at 16:01:23
 
Not knowing the history of it makes the answer difficult.
Dave's as close as possible considering the lack of real information.
If you're not the guy to open up the carburetor, try Sea Foam.
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piedmontbuckeye
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Re: Running Lean
Reply #4 - 10/20/17 at 06:11:19
 
Personally, I think they were jetted lean from the factory to suffice the idiotic laws in California - especially at the low end (idle and about up to 1/4 throttle)

Do the idle jet mod really helped mine (drill out plug, and re-adjust out a bit), and I expect to get into the carb this month and do a jet needle lift which will help the idle to 1/4 throttle "surging" which is from being too lean.
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