Honda-SOHC

SOHC.co.uk Forums => CB750 => Topic started by: westfieldandy on May 19, 2011, 06:02:32 PM

Title: 750 gearbox bearings
Post by: westfieldandy on May 19, 2011, 06:02:32 PM

Hi everyone

i just collected a set of bearings to rebuild my gearbox with, but the ones with the circlip groove have a narrower groove in them than the old ones, they have also come with a full circlip rather than a half one, this means the bearing could move in housing does'nt it, where should i order my bearings from to get the right ones.

andy

seeley
cr
britain
f2
f2
k7

Title: Re: 750 gearbox bearings
Post by: SteveD CB500K0 on May 19, 2011, 08:44:15 PM

Hi Andy. It's been a while.

Can you post pics of your bikes?

Here's the Seeley at North Weald in 2006 (September I think).

(http://www.nirvana-motorcycles.com/images/Seeley%20at%20North%20Weald%202006.JPG)

Eamon did eventually buy a Seeley (from Stafford) but had to sell it recently due to straitened financial circumstances (too many bikes, no job)

(http://www.nirvana-motorcycles.com/images/Seeley%20Right%20Side%20800.jpg)

Steve

Title: Re: 750 gearbox bearings
Post by: Bryanj on May 20, 2011, 07:25:42 AM

I think the only place you can get the correct bearings is Honda

Title: Re: 750 gearbox bearings
Post by: UKROBK7 on May 20, 2011, 09:11:19 AM

Where did you get them from?  I agree with Brian, I thought the Honda grooves were slightly different in width from the industrial standard.

Title: Re: 750 gearbox bearings
Post by: the-chauffeur on May 21, 2011, 10:23:08 AM

Yeah - the boys are right.  I had the same problem when I replaced all of the bottom end bearings with SKF's (don't ask how much).  The SKF outer groves are about 1/3rd the width of the ones from Honda.

Unfortunately, at least one of the Honda bearings is obsolete - I think it's one of the grooved ones - and I couldn't find anywhere that would supply the right groove sizes out of the box.  So, I took my new ones to a local machinist with the old bearings (together with the Honda circlip thingie) and got him to match them.  It's not that hard for someone with the right gear - I think I was charged

Title: Re: 750 gearbox bearings
Post by: westfieldandy on June 12, 2011, 06:23:34 PM

Hi everyone,

Thanks for your reply's it looks like i will have to try honda for bearings. or get grooves machined.

steve, i remember you from north weald, I will try and post some pics, unfortunately the seeley blew its engine up and i have not had time to put right, however, i managed a first place with it at thundersprint, and i took it to reims, and zolder for some demonstration events.  The engine ran very hot at reims and i reckon the oil became too thin and pressure went and some damage has occured. not sure how bad as i have not stripped the engine yet.

i will post pics in the appropriate place

andy