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Old 05-09-2017, 06:37 AM
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Default 02 RM250 2 Stroke revs too high

     

Hey Guys, Just bought an 02 RM250 and when it starts it revs extremely high. If I turn off the choke it dies.. Completely cleaned the carb and does the same thing. Set the carb settings all to factory.. The idle screws doesn't seem to do anything..The clicker on the choke doesn't seem to do anything.. If I unplug the TPS sensor the idle comes way down but you have to give it gas to keep it running... I just can't seem to understand why those adjustments don't make any difference....Carb boot looks fine...tons of compression..Any ideas?
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Old 05-09-2017, 07:13 AM
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Have you checked for air leaks?
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Old 05-09-2017, 09:35 AM
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The only thing I haven't checked is the stator side crank seal. Not sure where else it could be sucking that much air to make it scream like this... I wouldn't think the crank seal would do that. Carb boot looks fine.. Where else could it be leaking? Thanks
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Old 05-09-2017, 11:05 AM
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Any mating surface after the carb.
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Old 05-09-2017, 11:58 AM
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A plugged pilot jet will do this....A leaking crank seal will do this...A hung carb slide will do this....A TPS that is way out of adjustment can also do this....An air leak can do this....
A throttle cable routed incorrectly or has too much tension can do this...A carb float set too low can do this....
A throttle tub sticking can do this....

Paw Paw
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Old 05-09-2017, 12:47 PM
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Pilot is clean. The slide is bottoming out. Do you know if there is a procedure to adjust the TPS? It doesn't seem to make a difference if I screw it in or out. I have the choke clicker set at 12 clicks out however it doesn't seem to make much difference from one end to the other either. The only thing that seemed to make a difference is when I unplug the TPS... Would a bad crank seal make it rev really high?? Wont even idle down when i turn off the choke
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Old 05-09-2017, 03:09 PM
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I sounds like you want us to say: TPS. I'll play along... It's the TPS. Your manual will state if there is a procedure for checking and setting the TPS.

PawPaw wrote a pretty comprehensive list of what to check. We all miss stuff, double check the simple stuff before doing the big stuff. Check the float height, make sure the cables are routed correctly or even disconnected so they don't affect anything, blow through the jets and passages again, etc. Yes, a blown crank seal can suck in air and cause the bike to run lean which would make it rev high.
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Old 05-10-2017, 07:08 AM
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Just to update. Took off the carb again and thought I should take out the reed cage to check the gastkets etc... Well let's just say I think I found the issue. Whoever the bonehead was that worked on this bike before put the reed cage back in with half the gasket missing and part of it jammed into the intake... I guess that's not going to seal very well... Unreal. Thanks for the tips guys
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Old 05-10-2017, 07:31 AM
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Glad you found it!
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Old 05-10-2017, 10:49 PM
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Good to hear its an easy fix.
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Old 05-11-2017, 08:01 AM
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Yep, got a new gasket, put her on and imagine that...It idles.. Thanks for the tips guys. Cheers!
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