hello new here. I've searched the forums and cant find anything on it. I have a CBR900rr going to a jack shaft then to a chain driven rear diff. Im trying to find out what I should use for jack shaft bearings that can withstand high rpms. Thanks

Speak with ab performance they should be able to help and supply.

What have you got supporting the jack-shaft?

i believe they are cassette bearings. The problem is the output on the current engine is on the right side of the car and when i switch to the cbr its on the left. Ill have to flip the current jack shaft and cut it down more than likely. The jack shaft is tapered at the end with a bearing cap on it. Im just not sure what the bearings will be able to handle. I have the rev limiter set to 6500 with the current engine and the CBR will be 13000 so its double. I just dont want to be replacing these things every week.

I assume you will be using the CBR gearbox? The reduction gear between the engine and gearbox will reduce the output speed to near car engine values.