G5 EXHAUST VALVE

seabright · Post by **seabright** » Sat Mar 24, 2012 3:56 pm

Hi can anyone inform me if the 250 exhaust valves are the same as the 350, trying to locate a 350 valve and valve guide for a 1961 350 lighweight model 8 matchless, the club have none in stock, many thanks.

Rob Harknett · Post by **Rob Harknett** » Sat Mar 24, 2012 4:37 pm

http://archives.jampot.dk/Book/Spares_l ... s_List.pdf
see www.archives.jampot.dk

G2/G5 valves differ, easy to discover by checking parts list & pt. no's. I just did

Rob Harknett · Post by **Rob Harknett** » Sat Mar 24, 2012 4:38 pm

Mod 14 & 8 should be the same as 2 & 5 Matchless

Ozmadman · Post by **Ozmadman** » Mon Mar 26, 2012 3:44 am

quote:
Hi can anyone inform me if the 250 exhaust valves are the same as the 350, trying to locate a 350 valve and valve guide for a 1961 350 lighweight model 8 matchless, the club have none in stock, many thanks.

Inlets are different, exhausts are the same. Check ebay, there is an exhaust valve (new) on there

Paul

Ozmadman · Post by **Ozmadman** » Sun Oct 14, 2012 11:28 am

quote:
quote:
Hi can anyone inform me if the 250 exhaust valves are the same as the 350, trying to locate a 350 valve and valve guide for a 1961 350 lighweight model 8 matchless, the club have none in stock, many thanks.

Inlets are different, exhausts are the same. Check ebay, there is an exhaust valve (new) on there

Paul

Just to clarify as I came across this by mistake this morning whilst looking for something else on Andrews Engineering site

VALVES
042032 Valve (V87) Inlet 1958-63 250cc Lightweight
042033 Valve (V88) Exhaust 1958-60 250cc 1960 350cc Lightweight
042868 Valve (V192) Exhaust 1960-66 250cc 1961-2 350cc L/W
044002 Valve (V197) Inlet 1962-66 250cc 1960-2 350cc L/W

GUIDES
042068 Inlet valve guide - Lightweight 250cc & 350cc ALL MODELS
042069 Exhaust valve guide - Lightweight 250cc 1958-60 350cc 1960
042869 Exhaust valve guide - Lightweight 250cc 1961-66 350cc 1961/2

This was something I was unaware of so I checked my spare guides and Exhaust valve as yes true enough I have a (V192) EX VALVE and it's stem diameter is to big to go into the two spare ex guides I have. Presumably after 1960 they increased the diameter of the valve stem and the bore of the guide?? QUESTION... can the chunkier later ex valve be used in an older engine as long as the as later guide is used??? just for future info if I need to replace the valve/guide for any reason

Thanks Paul

Edited by - Ozmadman on 14 Oct 2012 10:29:19 AM