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Old 07-07-2007, 07:18 AM   #1
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Default Novarossi / Mugen MT12 Engine

Hello all, its been a while since my last post, but i still frequent this site to pick up new and important info. My question today is about my Nitro engine. In my last race i was loosing my tune, the fuel outlet adjusting screw seems to wiggle, and turn all the way clockwise when the engine is at high revs. Of course I loose the tune when this happens and need to make adjustments. Once at high revs the same thing occurs again. all the other adjustment screws are at the right points, but its the fuel outlet adjusting screw that cant seem to stay put. what can i do to fix this. Does this mean the fuel outlet adjusting screw is somewhat stripped 'dosent look like it' ,or is it the threads in the carb that are stripped

Any help would be great

thanks
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Old 07-07-2007, 06:13 PM   #2
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Default O ring

It needs new o rings in it.
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Old 07-07-2007, 08:19 PM   #3
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you still have this motor running wow cool

yes new o rings are needed
change all of them if you can get them.
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Old 07-08-2007, 08:03 AM   #4
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I have to agree with the others in this forum. Sounds like your "o" rings are gone. You will have to do a carb rebuild to check for sure. I would not run with a carb that loosens for any reason. Quick way to burn up a motor.
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Old 07-08-2007, 11:56 AM   #5
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its from `99, shes a horse
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Originally Posted by wallyedmonds View Post
you still have this motor running wow cool

yes new o rings are needed
change all of them if you can get them.
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Old 07-09-2007, 06:16 AM   #6
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Parts are still out there. Novarossi didn't change carbs until 2002. The "O" rings are the same from 99 to now. The only real change on Nova carbs is the lock down pin and nut. Parts are out there.
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