G80 Major 1964-66 Engine rebuild.

Information relating to the Matchless G80 or AJS Model 18 500cc Heavyweight.
Member
Posts: 24
Joined: Sat Nov 06, 2004 12:00 am
Location: EXETER, DEVON UK

G80 Major 1964-66 Engine rebuild.

Postby jockydee » Sat Jun 16, 2018 2:00 pm

Hi guys help needed PLEASE, I have been very fortunate to find someone (very capable) to rebuild my engine. However i'm not sure (if needed) where I might get the following parts:

1. Standard size piston with standard compression. + rings pin & circlips.
2. Crankpin cage & rollers.
3. Conrod.

Just the factory part numbers may be a good start, any help will be most appreciated.

Member
User avatar
Posts: 1226
Joined: Tue Jul 27, 2004 12:00 am
Location: BEDFORDSHIRE UK

Re: G80 Major 1964-66 Engine rebuild.

Postby Stuoyb » Sat Jun 16, 2018 2:05 pm

The piston and complete big end assembly can be obtained from club spares.
http://www.amoc-parts.com/store/comersu ... duct=22153

Not sure where you’ll find a conn rod - it will no doubt have to be s/h

Member
User avatar
Posts: 9330
Joined: Mon Jan 01, 1990 12:00 am
Location: ESSEX UK

Re: G80 Major 1964-66 Engine rebuild.

Postby Rob Harknett » Sat Jun 16, 2018 2:57 pm

You should see factory part numbers in your bikes parts list, perhaps this one. http://archives.jampot.dk/book/Spares_l ... _twins.pdf
You will need to refer to a later update supplement that refers to parts that differ from 1964.
http://archives.jampot.dk/book/Spares_l ... and_64.pdf

Member
Posts: 84
Joined: Wed Feb 01, 2012 1:22 pm
Location: 5550 HORDALAND, NORWAY

Re: G80 Major 1964-66 Engine rebuild.

Postby mdt-son » Mon Aug 06, 2018 10:58 am

Stuoyb wrote:The piston and complete big end assembly can be obtained from club spares.
http://www.amoc-parts.com/store/comersu ... duct=22153

Not sure where you’ll find a conn rod - it will no doubt have to be s/h


I don't believe 900594 CRANKPIN ASSY fits the 1964-on h/w engines? However, the big end assembly is available from Alpha Bearing, code AMC20.

As for connecting rod, there is a genuine WHT one for sale on eBay. Please verify length. The 1964- on engines used the 1956 type s/s connecting rod, p/n 022397.

New rods are also made by Carillo apparently. Maybe Don Madden will chime in with the order code?


-Knut

Member
Posts: 193
Joined: Tue Oct 24, 2017 11:05 am
Location: DEVON UK

Re: G80 Major 1964-66 Engine rebuild.

Postby MalcW » Mon Aug 06, 2018 11:12 am

A thread elsewhere says that unfortunately Don Madden is recovering after an accident, so I'm not sure he will be available in the near future.

Malc

Member
Posts: 84
Joined: Wed Feb 01, 2012 1:22 pm
Location: 5550 HORDALAND, NORWAY

Re: G80 Major 1964-66 Engine rebuild.

Postby mdt-son » Mon Aug 06, 2018 8:15 pm

Thanks for the heads up, Malcolm. Maybe someone else has this information, i.e., which Carillo order code is applicable?

Thanks,

Knut

Member
Posts: 5645
Joined: Wed Sep 01, 2004 12:00 am
Location: WEST SUSSEX UK

Re: G80 Major 1964-66 Engine rebuild.

Postby SPRIDDLER » Mon Aug 06, 2018 8:41 pm

mdt-son wrote:Maybe someone else has this information, i.e., which Carillo order code is applicable?

(My initial reply amended - twisted knickers syndrome).
You could ask Carrillo. After all it's a good place to start:?

https://www.cp-carrillo.com/pt-3508-rods.html
I poke badgers with spoons.

Member
User avatar
Posts: 432
Joined: Wed Mar 05, 2014 4:21 pm
Location: Oxted, UK

Re: G80 Major 1964-66 Engine rebuild.

Postby Peter Morris » Mon Aug 06, 2018 8:54 pm

G80 Major is covered in http://archives.jampot.dk/book/Spares_l ... G12CSR.pdf spares list. I take it you have tried the usual suspects if Club Spares can't help. I would talk to Les at Russell Motors, about what crank pin will fit etc, he'll know and highly likely be able to sell you one.
He is only there Tues, Weds, Thurs and Saturdays, can sometimes be hard to get hold of on the phone, so persevere.

Return to G80 / Model 18

Who is online

Users browsing this forum: No registered users and 6 guests