Mt throttle on my 450 will sometimes jump down to idle when i am pulling a load. I have tried a stronger spring and have tried making the throttle groves deeper and square. This helped but sometimes still having problems.I see they have new throttle friction type for a Super M, which I use on my SM works great but do not see anything for a 450. Do yall have any ideas or ways to fix this?
 
I was having same problem, I put two washers, one on each side with bolt all the way through and nut on end, it seems to work now
 

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