Posted by OH2IL on May 12, 2014 at 19:11:12 from (98.222.88.78):
In Reply to: racing mowers posted by high octane on May 11, 2014 at 07:10:00:
I have an early 80's craftsman with a 12 hp OHV Tecumseh governed to 4200 rpm which tops out at 45 mph. It has an 8 inch pulley on the engine and a 4 inch pulley on the transmission (you have to get the drive ratio up while maintaining pulley surface area for the belt to grip). The transmission is a 5 speed peerless with the ring and pinion out of a 200 series dana transaxle. I separated out the clutch, brake, and gas pedals so that it shifts just like a manual car. I built it 8 years ago and it has quite a few miles on it now. The key to getting them to last is to use high temp molly grease in the transmissions to withstand the high input speeds and high temperatures that build up in the absence of active cooling. The only way to get good service out a belt is to use the Kevlar belts like the ones TSC carries. For high speed cornering I usually pin the front axle and space the rear tires out to widen the stance. Since the lawn tractors typically lack suspension, I have found that running 3-5 psi in the rear tires makes the ride manageable.
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