Gearbox, layshaft bush, driveside

Information relating to the Matchless G5 or AJS Model 8 350cc Lightweight
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Re: Gearbox, layshaft bush, driveside

Postby vigo » Tue Jan 14, 2020 1:31 pm

I've just spoken to Gary at the cub spares and he aknowledges he has a bin full of the incorrect main bush 041266. They will now be taken out of stock
Mike

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Re: Gearbox, layshaft bush, driveside

Postby clanger9 » Tue Jan 14, 2020 2:57 pm

Oh, you’re right: my bearing says “ENU”, not “RNU”. Good spot!
1966 AJS Model 14 250 CSR "cafe racer"
1993 Ducati 750SS

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Re: Gearbox, layshaft bush, driveside

Postby Ozmadman » Tue Jan 14, 2020 10:44 pm

vigo wrote:Thanks Gents, I looked back at your old post from 2013 Paul, that's great info. I've just been arranging to have the bearing track machined this morning before I read your post, I'll cancel that. Called Russel motors, nice chap, he knows the bearing and should have stock in the warehouse.
I will now speak with our club spares and ask why they are selling the wrong bearing when this goes back at least 7 years.

The layshaft bush, which I'm trying to get a batch for the club made, can someone give me the thickness needed of the rim. The worn bush I've removed is 4.3mm. That's the bit that prevents gear contact with the case.

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I may have one somewhere, will have a look and measure it up
Paul
1960 Model 8
1974 Yamaha RD250B US Model 6 speed

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Re: Gearbox, layshaft bush, driveside

Postby Ozmadman » Tue Jan 14, 2020 10:54 pm

This may help, but cant remember which one I used but pretty certain it was the 32 mm I.D one , just a case of measuring the diameter of the track + a lot cheaper than when I bought mine!!

https://simplybearings.co.uk/shop/advan ... rds=rnu205
Paul
1960 Model 8
1974 Yamaha RD250B US Model 6 speed

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Re: Gearbox, layshaft bush, driveside

Postby vigo » Wed Jan 15, 2020 4:53 pm

That's a useful link Paul but that bearing given as example would have an inside diameter 0.5mm too small. My sleeve track measures 32mm. Russel motors claim they have what I want at the warehouse a week wednesday, of course more expensive.
Mike

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Re: Gearbox, layshaft bush, driveside

Postby vigo » Wed Jan 15, 2020 4:58 pm

Oops! I've scrolled down and seen the 32mm i/d Paul. By the way people this query title started as layshaft bush well, I've moved on to main bearing, sorry for confusion
Mike

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Re: Gearbox, layshaft bush, driveside

Postby Ozmadman » Wed Jan 15, 2020 5:20 pm

Here we are, sizes for the layshaft bush

Flange thickness 4.50mm or 0.177"

Outside dia 20.70mm or 0.814"

Inside dia 15.75mm or 0.621"
Paul
1960 Model 8
1974 Yamaha RD250B US Model 6 speed

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Posts: 40
Joined: Sat May 18, 2019 4:50 pm
Location: Cheshire UK

Re: Gearbox, layshaft bush, driveside

Postby vigo » Wed Jan 15, 2020 5:53 pm

Excellent Paul thanks, is there anything you don't know about this box of tricks? Many thanks.
Mike

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Re: Gearbox, layshaft bush, driveside

Postby Ozmadman » Thu Jan 16, 2020 11:29 am

vigo wrote:Excellent Paul thanks, is there anything you don't know about this box of tricks? Many thanks.
Mike

Just found out stuff during my restoration a number of years ago now. Could never afford to farm out work so just did everything myself and learnt as I went along. Did everything including the paintwork but the chrome was outsourced. I think "clanger9" has overtaken me in the knowledge stakes TBH though as I haven't had to do any real work on it now for over 4 years so have got a bit rusty. Queries like yours drags up knowledge that I had forgotten about so helps me to keep in touch...
Paul
1960 Model 8
1974 Yamaha RD250B US Model 6 speed

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Re: Gearbox, layshaft bush, driveside

Postby clanger9 » Thu Jan 16, 2020 1:15 pm

I wouldn't go that far, Paul! Most of my contributions here are based on what you've taught me... :beer:
1966 AJS Model 14 250 CSR "cafe racer"
1993 Ducati 750SS

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