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Re: 350 throttle problem

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Author  [Modern View]
The tractor vet

11-01-2012 13:24:58

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Your problem lies with worn parts. Starting with ALL the linkage and all the way down into the gov. Rebuild repair all the linkage and then ya get into the Gov. And once inside you will find that the spring has a bunch of slop in the holes of the arms inside , there is suppose to be hardened bushing in them big holes and NO slop . This past summer i rebuilt a friends 400 and he could not believe how much better it runs now. His kid was running my S/MTA and said how fast it responded to the throttle and he wished the 400 did that a few ours later and a quick trip to the machine shop to rebush the inside gov. arms it now only move one notch before something happens.

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11-01-2012 15:00:55

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 Re: 350 throttle problem in reply to The tractor vet, 11-01-2012 13:24:58  
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I've been into a few where those holes were severely worn, to the point the spring was almost ready to break through. I welded the hole shut and then drilled a new hole, which fixed the problem, but I like the idea of the hardened bushings even better.

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The tractor vet

11-01-2012 16:52:33

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 Re: 350 throttle problem in reply to rustyfarmall, 11-01-2012 15:00:55  
You can use bearing bronze or a harder steel and PRESS them in with .0015-0025 interference fit , Drill the hole a little bigger then the dia. of the spring wire then champer both side so that the spring is riding on about half the total thickness of the bushing and also allows for ease of getting the spring in the holes . Doing this cures idling down problems and also make the gov. work like it should .

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