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Discussion Starter #1
Ok I have an 02 954 I had the motor rebuilt this winter, frame powder coated and all, I put it together and it runs horrible, it will not idle try to give it gas it does nothing. Every once and a while it will wind out to the moon and if I try to ease it down it dies, I've had it shoot flames out the exhaust and intake. I have triple checked my grounds, firing order etc. Any input is greatly appreciated.
 

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Ok I have an 02 954 I had the motor rebuilt this winter, frame powder coated and all, I put it together and it runs horrible, it will not idle try to give it gas it does nothing. Every once and a while it will wind out to the moon and if I try to ease it down it dies, I've had it shoot flames out the exhaust and intake. I have triple checked my grounds, firing order etc. Any input is greatly appreciated.
Well the first part sounds like its running really rich so check all you connectors for Map and other sensors. The second part sounds like the timing is off. It should not shoot flames out the intake unless it firing when the intake is open. Cam, crank timing is off.
 

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Well the first part sounds like its running really rich so check all you connectors for Map and other sensors. The second part sounds like the timing is off. It should not shoot flames out the intake unless it firing when the intake is open. Cam, crank timing is off.

Yeah, you gotta be careful about the timing marks on the 954. I don't know why, but there are 2 sets of marks. This can mess you up. It definately is not timed properly. I would check the cam timing like the mad russian said.
 

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Discussion Starter #4
every sensor is right, every connection is tight. I am leaning towards fuel pressure regulator, the manual says if I don't have 6.4 oz of gas come our when I turn the key on check the fuel pump, fuel lines, and regulator. Well everything else is fine. I was originally leaning towards off timing but the motor was built by two very trustworthy and knowledgeable techs who both double checked the timing. I guess it may not hurt to check for myself but from what the manual says it sounds like a the pressure regulator is bad I just don't think I've seen one cause this many symptoms.
 

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well I have seen many a vehicle throw flames in a rough running situation to much fuel and backfiring through the intake. If it was doing it all the time I would agree to timing but a once and while situation makes I'd think its like a car or anything else just giving a backfire not running right.
 

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it could possibly be the cam chain tensioner is not tight. This would allow the timing to "move" which could in turn allow the motor to rev on occasion. I had an old truck that did the same thing, when the timing chain stretched on it. with the chain loose the cams can do whatever they want to a certain extent.
 

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well I have seen many a vehicle throw flames in a rough running situation to much fuel and backfiring through the intake. If it was doing it all the time I would agree to timing but a once and while situation makes I'd think its like a car or anything else just giving a backfire not running right.

The only reason you get a back fire is if the timing is off. Thats all I have to say on that. Whatever other problems there might be, any engine should close the intake valves before igniting the mixture, if the actual mechanical timing is good you might want to make sure that the pulse sensors are not damaged or aren't sending the wrong time to the ECU. (crank is 180 degree out)
 

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The only reason you get a back fire is if the timing is off. Thats all I have to say on that. Whatever other problems there might be, any engine should close the intake valves before igniting the mixture, if the actual mechanical timing is good you might want to make sure that the pulse sensors are not damaged or aren't sending the wrong time to the ECU. (crank is 180 degree out)
:plus1: tell it madman
 

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Discussion Starter #10
Well madman I owe you props. I broke down and pulled the bike apart and found the came off by 2 tooth or so. I am currently working on resetting the timing, gotta love it so much for being rebuilt wonder what else the jerk screwed up. I will let you guys know how it works out.
 

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Well retimed it and she purrs like a kitten even not being fully together missing the map sensor and airbox. Thanks for the help Russian and Carolina
 

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Well madman I owe you props. I broke down and pulled the bike apart and found the came off by 2 tooth or so. I am currently working on resetting the timing, gotta love it so much for being rebuilt wonder what else the jerk screwed up. I will let you guys know how it works out.
Your welcome, just glad that I could help!
 
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