Originally Posted by
motomatt
The GXII-5RHO front bearing size is 7x19x6.
The 17011 Nova bearing is 7x19x6.3.
If I'm correct, the extra width of the Nova bearing is because it has double seals at the front side. It would fit in the GO, but the extra width would cause it to protrude very slightly. This would then cause the clutch bell to be 0.3mm (about 0.013-0.014") farther forward than previously. I'm sure alternate shimming of the flywheel and clutch could compensate for this.
I'm mostly concerned about the O.D.! On AMain, it says that the O.D. of the Go front bearing is 18.6mm. I've read that the Nova front bearing fit the Go engines from a few years ago and was wondering if this was true with the newer mills. It's seems odd that Go would use a non standard O.D.! I've never actually mic'ed a Nova bearing to see if it had a full 19mm diameter. I might have to pull apart the Plus 4 to check.
Thanks!