Join Date: Nov 2004
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Sled: '95 ZR 580
ATV: '89 Yamaha Banshee
Part of the formula to how long before a rebuild on an engine is how the engine is set up. It seems that the dirt bikes that I have had have had have required rebuilds much more frequently than sleds I have owned. I think this is partly due to the porting and power output of the motors, but I may be wrong on this...
Another big part of the formula is how the motors are taken care of. I ride with about 3 or 4 guys who rebuild their motors once or twice a season because they ignore proper jetting and/or don't fix the real problem that caused the sled to burn down in the first place.
As for my current sled, I am rebuilding the motor in it this summer with only 3200 miles on it. A compression check revealed that the pto cylinder was at 85 psi and the mag side cylinder was at 120, and this is an EFI motor, so I wouldn't think that there should be any problem with jetting, etc. causing this motor to die.
Just my $.02