top bearing for front end swaps

Can anybody confirm the height of the standard top headrace bearing in a curvy please?

i've been searching hi and low for an upper race bearing for the sv to allow use of the standard Srad/K series stem in the SV headstock without any mod's to either. And it looks like there is one in the NSK bearing range, HR 32906 J, 47OD x 30ID. Only prob is it is only 12mm THK but reckon it should be easy enough to get a 3mm shim to pack it out to the correct height to match the height of the standard SV top headrace bearing unit.

[dirtydog]

You could just get one from twin works factory

[yorkie_chris]

Yeah should be fine, see which one's cheaper.

Yep I could get one from TWF, but i think it'd probably work out cheaper to get one from a bearing distributor over here rather than ordering from the states. just got to have a ring round and see where I can get them from. doesn't look like a very common size for a taper roller. but if NSK do one chances are some other company will too.

[yorkie_chris]

It's a wierd size but someone might have some kicking about.

According to someone on OSS, NSK are the only factory who make the hr32906. He is a bearing distributor and keeps them in stock, but he is in Oz.

Got a couple of enquiries out and there's no end of general bearing suppliers so keeping fingers crossed someone in UK can. I think an e-mail to NSK europe may be in order too. Also found a place called Nationwide Bearings who offer a custom service. The possibilities are endless.

well that NSK bearing is rarer than rocking horse poo, only offer I got on a week leadtime was from Brammer and it was £200 or 6 - 8 months and still very expensive. I've ordered some of the taper rollers from zoran at twin works factory as there's obviously no alternative available closer to home.

I found a bearing, its for a selector drum, i'll look up the # at work tomorrow and let you know the cost, pretty sure its the nsk bearing (ie ballrace), but will be a yamaha part # so more easily available

Originally Posted by Robw#70

I found a bearing, its for a selector drum, i'll look up the # at work tomorrow and let you know the cost, pretty sure its the nsk bearing (ie ballrace), but will be a yamaha part # so more easily available

is that 3 part bearing like stock or just regular ball bearing like for wheels?

Originally Posted by Robw#70

I found a bearing, its for a selector drum, i'll look up the # at work tomorrow and let you know the cost, pretty sure its the nsk bearing (ie ballrace), but will be a yamaha part # so more easily available

that'd be great if you have found one with 47 OD x 30 ID Robw, and if you've got a bearing number handy i'll check it out. Just have to make sure it's either an angular contact ball bearing or a taper roller.