Broke down busa

Natedog

Registered
:welcome:???I was thinking I have a dropped valve bike hard to start but when starts backfires and blows black smoke when revved up but after throttling for awhile to get it to warm up bike will idle by itself does this sound like a valve or fuel filter clogged also starter makes dragging noise but then will spin freely like it is supposed to.any suggestions would be appreciated. 06 suzuki hayabusa
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IG.

Registered
Sort of spotty description of the problems you are having. More accurate details (without any assumptions) would help, including the history of the bike.

Your plugs can be no good - producing weak spark, so when the engine is cold right after starting, the plugs may fire half the time leaving unburned fuel, but once ignited it's too rich and produces black smoke, and whatever unburned fuel got into exhaust burns there producing backfiring. Once the engine warms up, the fuel ignites better.

Starter is a separate issue. Not sure what you mean by dragging and free spinning.
 

DevilDawg1

Registered
Maybe be a burned valve, but not a dropped valve. If it drops a valve there will be no second guessing, you will know. Engine would not run long enough to warm up.
 

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