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Big end bearing
Posted: Tue Feb 25, 2025 5:16 pm
by John O
Good evening all,does anyone have a pair of big end shells stamped 1426M they would be willing to sell please?
Re: Big end bearing
Posted: Tue Feb 25, 2025 7:35 pm
by will_curry
Welcome to the forum John.
It would help to know what bike you want the shells for.
Re: Big end bearing
Posted: Tue Feb 25, 2025 9:11 pm
by 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
Re: Big end bearing
Posted: Wed Feb 26, 2025 8:19 pm
by 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.
Re: Big end bearing
Posted: Wed Feb 26, 2025 9:48 pm
by JohnnyBeckett
hi, John Dragonfly supply Bsa parts as well as Ariel
Re: Big end bearing
Posted: Thu Feb 27, 2025 9:52 am
by 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
Re: Big end bearing
Posted: Fri Feb 28, 2025 12:04 am
by 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
Re: Big end bearing
Posted: Fri Feb 28, 2025 11:03 am
by 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.
Re: Big end bearing
Posted: Fri Feb 28, 2025 11:06 am
by Roger Gwynn
Diameter of crank pin would confirm 1-3/8 is standard
Re: Big end bearing
Posted: Fri Feb 28, 2025 11:05 pm
by 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.