Quote Originally Posted by msafi65 View Post
018039 is the factory belt for 25-29 horse max. It should measure 44 11/32 outside. The 018033 is briggs only and measures 42.5 outside. I run a Carlisle 1116 m3 on the 25-29 hp models. The magnum engine 4 ran a 1060 from the factory and is very difficult to install. I run a 1042M3 on all the 20-23 horse kohler max 4s. If I posted the wrong numbers at one time I apologize.
I'm not sure where I read it but thanks for the update! This is great information msafi65. There should be a sticky thread at the top of the forum just for part numbers and cross reference info on these machines. It's needed now more than ever with the current parts situation. I'll have to go back and check my factory belts, I could have sworn they were the 018033 belts that you said match the 1092M3 belts I bought but I'll hazard a guess that I made a mistake and they are most likely 018039