Question about 2001 Yamaha YZF-R1

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Backfireing when decelerating

I have a 04 FZ1 that wants to back fire during deceleration. It usually only backfires once per deceleration. I have not noticed a loss of power or fuel milliage.

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It can be caused by a number of things including.
lean mixture--air leak intake or exhaust,
leak in exhaust gasket
low ignition voltage- bad plug,lead\resister cap
tight valve clearance
and a number of less likely problems like faulty kill switch, ignition switch\cable connecter,igniter.
If it is not the standard exhaust, the jetting may need a slight change

So first give it a tune and service, check valve clearances,new aircleaner, drain carbs, tighten exhaust bolts and clamps, intake clamps and bolts,it may need exhaust gaskets

Posted on Jul 08, 2010

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