K-90 K-91 Differences

[HorseFixer 2,012]

What are the differences between A K-90 and K-91 like on the internal parts pistons, rings, rods, main bearings? I have a few of these that will need refreshing. My Kohler manual only goes to K-91 I dont have manual for the K-90

Thanks Duke :whistle:

[TT-(Moderator) 1,127]

Without digging through a bunch of CD's of all the stuff I just cleaned off of my hard drive, I'm going to say that the K-90 and K-91 Kohlers are VERY similar internally.

I know the K-90 cylinder heads have angled cooling fins and the K-91's are straight, and that the K-90 is governed at 3600 no-load rpm (3.6hp) and the K-91 is governed at 4000 no-load rpm. (4.0hp)

I'll have to see if I can find the rest of the information when I get a chance.

[HorseFixer 2,012]

Thanks TT I have about 6 between the two that need freshening up Any info would be great!

Thanks Duke