Yzf 1000r will not start // after engine rebuild?

Question

I have a yzf 1000r and it will not start. I check the spark plugs and coils and clean the carbs. I was wondering if the cams timming mark could be wrong? when trying to crank the bike back fire through the intake and blows the carbs off? Bike cranks over ok but back fires out the exhaust and intake? Need help ???

Answer 1

Yes, the cam timing being off could cause backfires.  However, before you tear back into the engine, I'd check and make sure the spark plug wires are on correctly.

Answer 2

ya what he said,its firing plug while valves are open,wiring to coils switched ?