I have a Oliver 550 special that doesn't go into high rpm it starts and runs fine at idle but can't get it to go over 150 rpm it has a new zebco carburetor and it is all set up right with a in line fuel filter it starts to sputter then stall when increasing the throttle I did a valve compression test and they all read in the 140 range so I'm shure the valves are good and new points and condenser my question is why won't the tractor go into high rpms
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