Different Gear Ratios?

[FreddieFarmall 1]

I thought the 8-speed transmissions were essentially the same, but have run into an issue that has me curious. My Father-in-law is into garden tractor pulling.  He has a C-175 that has a Honda 20hp, 2 cyl engine.  It is really fast in 3rd high.  He has built another one that started life as a C-105 and now has a Kohler 25hp, 2 cyl engine.  They both have the same size pulleys on the engine and transmission, but the C-105/Kohler is not nearly as fast. Any ideas what is going on?

Thanks, Fred P

[Callen 64]

Are they both on the same size tire?

[953 nut 56,165]

The   C 105 and C 175 both came with the Wheel Horse model 103916   8 Speed trans, my guess would be that the two cycle engine turns a lot more RPMs than the Kohler. Need to find someone with a tac to check it out.

 

 

[dbartlett1958 96]

He said 2 cylinder, not 2 cycle. Some other factor at play here. Governor issues?

[meadowfield 2,616]

A modern Japanese engine may well comfortably rev higher than a kohler. My Honda quad engine revs to 7000...

[baerpath 517]

Also depands on how far into the pulley the belt fits. Aftermarket pullies are like tires size depends on what they make them not what there listed to be. I bought a B pulley for mine and the B belt hardly fit in the groove 3/4 of the way.