Harley were known to supply un-numbered cases for the KR and XR as the AMA insisted on title papers for race bikes. Never personally seen jap replacement cases un-numbered...
The steering head bearing thing is not simple. My understanding is that the top shit stuff uses balls, yes, but caged not loose. Never found a source for these in NZ. repeat, in NZ. Given that real race stuff is liable to have forks/offset yokes/stanchions changed at the track, you really don't want to use loose balls.
Properly aligned taper rollers - in a stiff steering head piece - will certainly carry a higher lateral load. I'd use them for preference in a short sidecar over balls.
A period comment is relevant here - practise for the WSB at Manfield, I went to see Hepburn to see how his engine was peforming. He was saying that he could not believe how physical the European riders were at the end of the back straight. They went in very deep and faster than he was, then gave a hard pull on the bars to get it turning. Very high steering loads going in at that point.
I think the idea of the Race bikes using balls is simply the steering head can be smaller and the bearing is lighter. any advantage is worth it, Taper rollers will of course last longer, Those Cadged balls things Suzuki run must be a far bit cheaper to make.not much diferent to push bike wheel bearings.
Honda NF4 ones were taper rollers and are made of unobtainium. unless you want to machine to size from another. Bloody Honda and bearings and seals.
I had a search around and yeah the Hondas def replacement cases were un numbered on the Cb750's anyway.
http://forums.sohc4.net/index.php?topic=49903.0
I think the RC30 and VFR stuff differences was in something i sent to you wasnt it?
http://rc30.yolasite.com/engine.php
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Kinky is using a feather. Perverted is using the whole chicken
I bought nf4 ball caged bearings from tss via eurobike , no wait um, k4 , k2, um. . . Ok some accessories distributor. The difference is where the bearings bear against supposedly and , ahh, I got told some stuff in the 90s but buggered if I remember
3rd edit. R2.
Don't you look at my accountant.
He's the only one I've got.
Well yeah . He's not kinda normal.
Good guy though make no mistake.
Don't you look at my accountant.
He's the only one I've got.
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