Latest News and Tips • Please note: the nature of my blueprinting business is changing. -- Please read this letter for more information. updated 3/30/08 • Many Comer K80s in the latest factory production run have loose bearing bores that are also significantly out of round. • The #1 reason that a main bearing will "spin" in a case is restarting an engine without adequate cool-down. Why? Heat from the clutch and exhaust "soak" the engine and cause the cases to get hotter than when running on the track. Let the the engine cool a bit before restarting to avoid this problem. • Main bearing interference can increase dramatically on a cold morning at the track, which can cause main bearing damage when first starting. I always recommend pre-warming the case of an engine before first starting. "Warm to the touch" is adequate.

Muller Machine has more experience blueprinting kart engine cases than any company or engine builder in the world... period!

I have been remachining cases since 1977, and have machined thousands of cases... every one of them to greater accuracy than the factory can do.

It pays to specialize... and that's the reason that most of the top engine builders in the U.S. (and some overseas) use Muller Machine.

This service is offered on:

Yamaha KT-100 -- Honda CR-80/CR-125 -- 80cc Comer -- HPV -- as well as; TKM, DAP, PCR, Komet, Parilla, etc. (virtually any reed, rotary or piston valve engine used on a kart)