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'08 rmz450 fuel problem ?

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Have a bike in my shop that won't crank. Customer said it cranked momentarily the last time he tried to ride and backfired and went dead....have not been able to start since.

So far : checked timing / valve lash / spark plug is firing / compression is good / fuel pump IS pumping / fuel is being pumped to the injector / air filter clean / fuel is fresh / voltage to fuel pump is correct.

Has anyone seen or heard of the injector going bad ?????

Oh, and by the way....you can spray starting fluid in the air boot and it will run for a couple of seconds.

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