Big end bearing

[John O]

Good evening all,does anyone have a pair of big end shells stamped 1426M they would be willing to sell please?

[will_curry]

Welcome to the forum John.

It would help to know what bike you want the shells for.

[JohnnyBeckett]

hi, John welcome to the forum and have tried Drags for the bearings or you can try a bearing supplier if you got numbers on the bearings all the better

[John O]

Thankyou l will look for Drags they’re for a 1954 BSA 420 cc that’s the power unit for the Trac Grip I’ve just bought l love forums like this as l find all engines interesting and the talented people that post their work.

[JohnnyBeckett]

hi, John Dragonfly supply Bsa parts as well as Ariel

[Roger Gwynn]

The only 1954 BSA using shell bearings was the A7/10 twins, unless you have an industrial engine. Do you have an engine number? I think that number is for an individual shell, the sets have a different number, and was used on Ariel KH and SQ4, neither of which was ever 420cc. If so Draganfly part K140-47

[Simon.Gardiner]

Trac Grip - definitely not an Ariel (although they did once make various 'traders' machines!) I guess John's casting a wide net.
Engine looks to be a single-cylinder side valve.

There's a vid on FaceBook about a restored one (which is where I got the pic):
https://www.facebook.com/watch/?v=2637171076414865

I'm not sure how things are these days but at one time I'd have asked Thorntons if they could help with bearing shells.
https://www.fwthornton.co.uk/

SG

[Roger Gwynn]

I have never heard of a Trac-Grip. There used to be a firm in Sarf Lunnun that specialised in industrial engine spares, Meeton's I think it was, no doubt long gone. That shell number was certainly for KH/SQ4.

[Roger Gwynn]

Diameter of crank pin would confirm 1-3/8 is standard

[John O]

Thankyou all for the information, it’s an industrial engine that apparently shares the same big end shell bearings as an arial either 500 twin or sq 4 it’s early days of the restoration so everything is very new to me l really appreciate you taking the time to reply and help me with my seemingly never ending journey into the distant past.
Regards John.