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Re: Matchless 350 G5 piston and rings.
Posted: Sun Sep 13, 2020 3:35 pm
by Andy1730
Hi all ..I am building a 350 G5 from a box full of bits I bought off eBay..I am looking for a standard piston and rings ..the barrel has been bored out quite a few times and I've been told it's better to have it sleeved and bored back to standard...I've had a look round on a few sites but had no luck in finding one can anyone help..Many thanks. Andy.
Re: Re: Matchless 350 G5 piston and rings.
Posted: Sun Sep 13, 2020 8:15 pm
by clanger9
Some good info in this thread:
http://www.jampot.com/forum/viewtopic.php?t=15584
Apparently a 1959 (only) 650 twin piston will fit...
Re: Matchless 350 G5 piston and rings.
Posted: Mon Sep 14, 2020 9:29 pm
by Rangy65
Try J W Thornton
https://www.fwthornton.co.uk/15151-std- ... l-8-295352
They have the models mixed up between Matchless & AJS but a G5 & Model 8 are the same.
I always use Australian JP pistons in my G5's built four now and all are running fine ( with different owners).
G5orModel8piston.png
Re: Matchless 350 G5 piston and rings.
Posted: Mon Sep 14, 2020 9:53 pm
by Rangy65
Apparently a 1959 (only) 650 twin piston will fit...
Sorry but this is not correct. The 59 650 twins have a domed piston which just will not work in a 350 lightweight G5 or Model 8
See photo below which is self explanatory. Lightweight on the left, Twin on the right.
G5vModel31Piston.jpg
Re: Matchless 350 G5 piston and rings.
Posted: Mon Sep 14, 2020 9:59 pm
by ajscomboman
Rangy65 wrote: Apparently a 1959 (only) 650 twin piston will fit...
Sorry but this is not correct. The 59 650 twins have a domed piston which just will not work in a 350 lightweight G5 or Model 8
See photo below which is self explanatory. Lightweight on the left, Twin on the right.
G5vModel31Piston.jpg
Sorry Steve but you're wrong as I actually wrote the info. A 59 twin piston does fit and raises the comp quite nicely. I know as I modified the skirt to clear the flywheels and ran it for years, very nippy it was too as my section will testify.
Re: Matchless 350 G5 piston and rings.
Posted: Tue Sep 15, 2020 9:13 am
by les ward
I remember Rob doing this and it certainly was a nippy bike, which accelerated better than the heavyweight 350s. I think I saw it a Jampot rally a few years back with its new owner, who seemed pleased with it.
Re: Matchless 350 G5 piston and rings.
Posted: Tue Sep 15, 2020 11:47 am
by Rangy65
No problem Rob but it has to be modified its not a direct replacement.
Re: Matchless 350 G5 piston and rings.
Posted: Tue Sep 15, 2020 5:31 pm
by G15 Roy
les ward wrote:I remember Rob doing this and it certainly was a nippy bike, which accelerated better than the heavyweight 350s. I think I saw it a Jampot rally a few years back with its new owner, who seemed pleased with it.
Quite right Les that would have been Alan Earl sadly no longer with us but the bike is, and currently for sale on our web site may be Mr Swift may like to buy it back?
Re: Matchless 350 G5 piston and rings.
Posted: Tue Sep 15, 2020 7:17 pm
by shifter
And the little 350 lightweight in question that was for sale is spot on
Re: Matchless 350 G5 piston and rings.
Posted: Tue Sep 15, 2020 7:19 pm
by ajscomboman
G15 Roy wrote:les ward wrote:I remember Rob doing this and it certainly was a nippy bike, which accelerated better than the heavyweight 350s. I think I saw it a Jampot rally a few years back with its new owner, who seemed pleased with it.
Quite right Les that would have been Alan Earl sadly no longer with us but the bike is, and currently for sale on our web site may be Mr Swift may like to buy it back?
That's not my L/W Mr B.