Crank Rebuilding and Center Bearings

**Wed Apr 30, 2008 4:54 am » Post: #1 » Download Post**

Hi,

With all this talk on rebuilding cranks and sourcing center bearings from various places Im hoping someone will be able to shed some light on a crank I have here...

This crank has been rebuilt - the bearings are not original Honda items. The center bearing is narrower than a standard bearing, it doesnt have provision for the seal, it doesnt have the oil gallery opening - none of them have the locating pin.

Is this what the replacement bearings you guys are using like?

The problem is the center bearing - having no seal may mean the engine wont run properly - this seal keeps the pressure in the two crank halves separate. Also with no provision for the oil gallery Im not sure if it will run dry?

Any thoughts?

**Wed Apr 30, 2008 4:22 pm » Post: #2 » Download Post**

People ar using original Koyo bearings(the ones Honda put into the NSR). Search the forum, a guy in Greece has found a source for all three of them.
Your bearings sound like totally unusable.
_________________
Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom

**Wed Apr 30, 2008 5:41 pm » Post: #3 » Download Post**

I got mine from mixalisen, he is on this forum, top service from him, bearings were identical koyo type that honda use.

dont like the sound of the ones you got, i would not use them.

cheers

richie.

**Wed Apr 30, 2008 10:03 pm » Post: #4 » Download Post**

A friend of mine seized his running bearings similar to how yours sound.

Fenton has had some success apparently running bearings other than Koyo's but I believe the one's he found are "just" not rated for the speed. i.e. they are the correct size and fitment.

As mentioned you'll need a source for the o.e Koyo's, they are not available to retail.
_________________
Please do not PM me technical questions, if you can't find it on the Forum start a thread

**Sun May 04, 2008 12:29 am » Post: #5 » Download Post**

Thanks for the info - this crank is now a paperweight Smile

Ill get onto mixalisen about some replacement bearings then...

**Thu May 08, 2008 11:13 pm » Post: #6 » Download Post**

Bearing in mind the age of some of the bikes, it would be good to compile a spec of the bearings required for all NSR models in the workshop section. What do you think Andy?

There's a Koyo web site for the UK and I'd be interested in finding out if we can get what we need for crank rebuilds