o6 yz450

Was running fine until crashed on right side. Now it is very hard to start, usually needs to be pushed off. And is really running rough?

Exactly what do you mean by "crashed on the right side"? Without more info, I guess I would suggest checking the exhaust system for damage, or dirt plugging the muffler.

The bike is popping and backfiring. Like a car out of time. Not blubbering like dirt in the carburetor. Changed the plug and checked the cap.

Check the hot start lever and cable and make sure it isn't engaged!

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