I stopped to help someone in Normandy who had broken his rear chain, he had a new chain with him that wouldn't fit, the rear wheel had a 400x19 tyre so was hitting the mudguard in either direction before all the adjustment could be used, I had half links for both chains with me and managed to get him going again.
Another possible problem could be the sliding plate in the back of the primary chain case, is it moving to its full extent?
You go top of the class, I scraped back the paint to see the part number, and looking at the forum posts, I found the following info that it's for a B series. There is very little difference. Alittle red faced.
Thank you for everyone's help. I will pop down a mates on Monday to see if he has the correct part.
The issue you mention Rob with the chain, is that common 1/2 a link?
I have often found 1/2 links to be needed, and new chains stretch after you fit them so sometimes you need to tinker again quite soon after you fit a new one.
Is the standard chain length not shown in the workshop manual ? WD Nortons with 18t engine and 42t clutch ran a 74 link primary...but every Renold chain spare parts tin included cranked half links. If you use one though, fit in the correct direction (so that it pulls together rather than apart).
Yes Rik. The standard WD 19T engine sprocket was fitted with a 69 link primary chain. Since I upgraded my engine to 600cc, I fitted a 20T sprocket and a 70 link chain. A 21T sprocket would require a 71 link chain.
I tried a 21T sprocket but found it to tall for my liking, so went back to the 20T. Ron