I'm seeing a few 550s for sale. Not to many 650s. My 650 only reved to less than 9000 rpm. While my 525 hit 14000 rpm. The 650 made strong torque everwhere. The 525 not so much.
So my question is: where does the 550 fall in on this curve? Is it a low rever like the 650? Or a high rever like the 525? Where does the torque start to really kick in.
I would love to pickup another tractor pulling rig.
If you ask me, I'd say that two wheels is all you need.