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post #1 of 5 (permalink) Old 11-09-2007, 03:41 PM Thread Starter
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carb adjustment

My 450 is running a little rich (sometimes backfires under compression) and smell rich. What is the proper way to adjust the carb? I don't want to get it to lean and cause problems there. Thanks Steve
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post #2 of 5 (permalink) Old 11-10-2007, 12:43 AM
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Go to the ENGINE section and look under the sticky: How to jet a carb.

This thread is basically a crash course in carb trouble shooting. I think you will find your answers there.
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post #3 of 5 (permalink) Old 02-27-2008, 03:51 PM
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Mine has been backfiring ever since it has been new. No mods to intake of exhaust, any ideas why? just on decel.
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post #4 of 5 (permalink) Old 02-27-2008, 04:06 PM
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Quote:
Originally Posted by EXTRA CHEESE View Post
Mine has been backfiring ever since it has been new. No mods to intake of exhaust, any ideas why? just on decel.
You may have a intake or exhaust leak
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post #5 of 5 (permalink) Old 02-27-2008, 04:37 PM
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What i have been told by Montclair Yamaha is that the carb need to be removed and the air fuel mixture cap need to be removed and adjusted. Ever heard of this, seems kinda strange for stock. Of course for a small fee($75.00) they can make it go away.
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