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Help! Bike won't Start!?

11596 Views 29 Replies 8 Participants Last post by  jaraxle1zx
I have a 1994 CBR900RR which after rebuilding ran great and rode nice. One day while starting it up after a 2 day rest, it started roughly and and while applying a little choke it stalled, never to start again! Spin, Spin, Spin no bang! Checked Spark, it's good. Checked fuel, it's getting it.

After many attempts to start it, it finally started backfiring as the only sign of life. After another 6 days of checking, testing, verifying electrical, etc. it started making the weirdest gurgling sounds in the exhaust (like it was under water and sloooowww...), neat, but not the sounds I or anyone would really want to hear from a Blade... it started backfiring along with the gurgling and at one point it started and ran! Rev'd somewhat decently, but still with loud backfiring intermitently. Turn it off, won't start.

Checking the plugs throughout the trials and tribulations, it seemed they were consistently wet with gas each time. This leads me to believe 2 things, the bike is flooding for one of 50 different reasons, or the cam timing has skipped a tooth and valve timing is off. Checking the carbs and float needle operation turned up no visible signs of malfunction.

Is it possible that the pressure switch has gone on the fuel pump? Does it have one on this model? Can the fuel pump provide too much pressure and force fuel past the needle valves? This is extremely frustrating given that the bike was running fine 2 days earlier! Several bike mechanically/electrically inclined friends with loads of experience are scratching their heads as their particular area of expertise seems to check out.

Your help and wisdom is greatly appreciated by a new member without his ride... Thank you.
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sounds like over fueling ..turn it over ,after it wont start ,remove the down pipes and exhaust and fuel should be inside. If running from the carbs will be in the crank also ...
iam sure its over fueling ...:eyebrows: . execess fuel doesnt always pour out of the carbs onto the engine ...but can go into the engine and not be visible outside , hense the cranck case will fill with fuel and the exhaust will show signs of un burnt fuel in one or more of the down pipes ...if try turning the bike over for to long with out ignition and the fuel will pool at the lowest point of the exhaust. if you find this then thats your problem and carbs need to be cleaned or serviced.
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