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  #1  
Old 03-22-2012, 07:22 AM
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Default Can't get my rebuilt motor to start

I just rebuilt my 2004 rmz 250 I have everything together I have the timing set right I have a spark and I have fuel from the carb.
I had my buddy pull me down the road and I was able to get it to start and run but not very well it will die as soon as I pull in the clutch. Once I got pulled to about 20 mph I could actually drive it but it sounded like it was begging for fuel or something.
Any help would be appreciated thank you
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Old 03-22-2012, 08:52 AM
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Should have got a 2 stroke
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Old 03-22-2012, 09:25 AM
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if it sounded like it was begging for fuel, it may have been doing just that. air leaks can make it seem like that sometimes. at TDC on the compresstion stroke do you have clearance on all the valves?
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Old 03-28-2012, 12:00 PM
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I checked my valve Clarence again and it all seems good
The bike will start and run for 2 seconds after I kick it if I hold the throttle wide open.
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Old 03-28-2012, 02:05 PM
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doesnt sound fuel starved then.
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Old 03-28-2012, 02:37 PM
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Quote:
Originally Posted by Dustb78 View Post
I checked my valve Clarence again and it all seems good
The bike will start and run for 2 seconds after I kick it if I hold the throttle wide open.
Ok, how long was the bike apart or not running during the rebuild?
Is you spark Blue?
Was the stator put back in corectly?
Are you 100% sure the valves are set correctly?
Are you 100% sure the cam timing is 100% correct?
Was there fuel left in the carb while the engine was being rebuilt?
Have you tried to clean the pilot jet in the carb?

Tere are so many things it could be but is would be my order of checks.
1. Cam timing
2. Valve clearances
3. Spark plug (new)
4. Remove the pilot jet from the carb and make sure the center orfice is open.
5. Set your fuel screw to about 2 turns CCW from fully seated.

Paw Paw
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Old 04-12-2012, 01:14 AM
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Quote:
Originally Posted by PawPaw View Post
Ok, how long was the bike apart or not running during the rebuild?
Is you spark Blue?
Was the stator put back in corectly?
Are you 100% sure the valves are set correctly?
Are you 100% sure the cam timing is 100% correct?
Was there fuel left in the carb while the engine was being rebuilt?
Have you tried to clean the pilot jet in the carb?

Tere are so many things it could be but is would be my order of checks.
1. Cam timing
2. Valve clearances
3. Spark plug (new)
4. Remove the pilot jet from the carb and make sure the center orfice is open.
5. Set your fuel screw to about 2 turns CCW from fully seated.

Paw Paw
Sounds to me like the cam timing is out by 1 tooth. Recheck the markings.
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Old 04-12-2012, 01:35 AM
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If you find your cam timing is out you will want to make sure the valves didnt hit the piston. if they did, they are almost certainly not sealing anymore.
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Old 04-13-2012, 11:55 AM
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The cam timing is perfect I checked it and rechecked it
If the exhaust valve clearance is too small could it cause this to happen?
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Old 04-13-2012, 12:06 PM
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Yep that could be it, anytime valve lash gets off does weird stuff and not all bikes react the same.
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