Hmm... I think this one did 32 km/h at 2000 rpm... With bigger tires, 12.4 or 13.6.. Yes it did rev extremely high.. Rough estimate would be 4000 to 4500.... Yes the risk of flying pistons is certainly there, so we top speeded it at 65 km/h and then had to slow down for two reasons: first, there was a curve in the road to be taken, and second, we were afraid to wreck someone else's tractor... The guy still has it to pack his horse pastures and similar jobs.