chaincase plug

Information relating to the Matchless G2 or AJS Model 14 250cc Lightweight
Post Reply
BeenyBoy
Posts: 64
Joined: Wed Sep 18, 2019 11:42 am
Location: Lincolnshire UK

chaincase plug

Post by BeenyBoy »

1965 G2csr

Hi guys

just a quick one..can someone tell me the size of the primary chaincase drain plug please

ta
User avatar
Martin.S
Posts: 443
Joined: Sun Mar 18, 2018 12:02 pm
Location: Bristol UK

Re: chaincase plug

Post by Martin.S »

In the bottom of the primary cover? - 1/4 Cycle.
BeenyBoy
Posts: 64
Joined: Wed Sep 18, 2019 11:42 am
Location: Lincolnshire UK

Re: chaincase plug

Post by BeenyBoy »

Thanks M... I thought so but couldn't get 1/4BSC to screw in- the thread must be damaged -Didn't want to put the wrong tap through it to clean it up

cheers
Roderick
Member
Posts: 168
Joined: Mon Jan 01, 1990 12:00 am
Location: WEST YORKSHIRE UK

Re: chaincase plug

Post by Roderick »

The plug in three LWT primary chaincases in my possession are 5/16 BSF (22TPI). Is 1/4 BSF (26TPI) the original size?
shaunstaples
Member
Posts: 238
Joined: Sun Dec 04, 2022 12:15 am
Location: Sheffield

Re: chaincase plug

Post by shaunstaples »

Something I remember from way back is although both 1/4 bsf and cycle are same tpi but not thread angle. I can hear my dad saying “just wait a minute” while I spannered it in claiming”it fits”.
Easy to convince yourself especially straight into aluminium.
Roderick
Member
Posts: 168
Joined: Mon Jan 01, 1990 12:00 am
Location: WEST YORKSHIRE UK

Re: chaincase plug

Post by Roderick »

You're right but the difference scarcely matters in practice for 1/4 size.
Post Reply