2005 raptor 660 problems need help - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums
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post #1 of 5 (permalink) Old 10-13-2010, 10:09 PM Thread Starter
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2005 raptor 660 problems need help

Ok so my raptor 660 will not start and all it does it turn over and over and then backfiers but wont start. i can jump it and it runs great and then it will start after i ride and shut it off but if i let it sit it just does not start and always backfiers what could cause this and has any one else had a problem like this with theirs
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post #2 of 5 (permalink) Old 10-22-2010, 08:44 PM
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Check your carberator pilot jet. Also check your electrical like the coil, ground wires, stator, check for good spark, etc. Cold starts are rough and hard for fourstrokes like the raptor 660, but can be tuned to work better. I don't know anything really about the Yamaha Raptor 660R, but I'm just trying to help. Maybe give you something to look at.

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Last edited by 2004mxyfz450_racer; 10-22-2010 at 08:46 PM.
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post #3 of 5 (permalink) Old 10-22-2010, 08:49 PM
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my 01 660 raptor was getting like that i had to put a needle jet in one of the carbs.
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post #4 of 5 (permalink) Old 10-22-2010, 09:16 PM
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why the hell is this in the yfz maintenance section?

moved for ya.
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post #5 of 5 (permalink) Old 01-15-2011, 01:57 AM
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like already stated check carb and clean look for bad orings and worn needle jets......while ya got it that far apart and because itll be the next thing on yer list to look at go ahead and adjust the valves while youre there......simple on the 660 theyre not shims theyre old skool screw an nut......replace plug add fresh fuel an oil change, verify battery good and fully charged service air filter an go go go...
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