Clutch and Engagement RPM Recommendations

Chuck D

Looking for recommendations for the following:

Stock Predator Class: 375# plus (I'm a big guy, will be hauling more than the minimum weight requirement for the class)

Engine box stock except for a header/muffler pkg, an air filter and adaptor, and a larger jet in the carb.

What would be your recommendations for a clutch choice and a stall speed recommendation (2700 rpm?)

Thanks for your input !


Premium User
Bully clutch would be the way to go for sure...
But are you sure about 2700 rpm engagement?
I had thought that the peak torque was a good bit higher, but I don't build Predators, (just clutches for them.)

🏁Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cutz
Carlson Motorsports on Facebook
31 years of service to the karting industry
Linden, IN
Were seeing here 2600 to 2850, there not built Predators there out of the box, race RPM is only 4800 to 4900.


Premium User

The Predator out of the box should be max torque @ 2500.
I'm sure there's plenty of builder tricks & tweaks within the rules to raise that higher.
The "built" or "tuned" ones that I've built clutches for were all 3000 - 3200 rpm engagement even with the governor in place. Seems like a pretty narrow powerband to work with between peak torque and peak rpm, but hey - to each their own. :)