I am hoping for some answers here. I am at a complete loss. I have bought a John Deere 50 about a month ago. When I bought it was told the carb was redone and needed to just be adjusted. So after many hours of adjusting the carb the tractor still would not idle. So sent my carb to poppin john and had it rebuilt. Got it back and still not difference the tractor will not idle. So after furter investigation found out that the distributor needed to be rebuilt. Sent that to poppin john also. Got it back after set the timing on the tractor still won"t idle. The timing on the high rpm is right at 20 the timing on the low rpm is right at 20 is that normal? So after reading the manual decided to adjust the gap at the tappets. Find out there was no gap at the tappets so adjusted that to .020 and the tractor still will not idle. I adjusted the trottle rod to 1/2 hole short. The tractor will not idle. Can you guys please offer any suggestions.