Triumph / Royal Enfield 'Trifield' 500 trials - Thoughts on that knocking noise from the gearbox.

The jumping out of third is sorted, but something else was bothering me and it seems the gearbox is probably the culprit, so ...

[@shug831]

Glad the owner is so supportive of all your time and effort.

[@hermangibbs8163]

Thanks Paul.

[@norsehall309]

G'day Paul, don't you just love classic bikes, they can make you smile or cry, at least your getting paid, l hope, cheers mate and thanks for sharing, cheers, Neil 🤠.

[@noeldoran8884]

Great illustration of deductive logic that is how its done old school.......

[@alanwilkinson5152]

You are an absolute perfectionist it's going to take more than this to stump you. Alan Northern Ireland 👍

[@paulhenshaw4514]

Thanks!

[@track1219]

I recall a Honda 175 twin that had a sound like that, more of a knocking sound however. The cause was a tiny bit of a shop rag jammed between 2 adjacent gear teeth on the crankshaft pinion gear. Yours truly didn’t look hard enough at things before assembling it!

[@RevQuads]

The output shaft is bent. You can see it by the wobble in the clutch.

[@paulhenshaw4514]

No, and that is the mainshaft, the clutch centre is a slightly loose fit on the splines - many are and it is not a problem.

[@750triton]

The clutch wobble is intended. It helps with chain alignment when the clutch is lifted

[@Jimdirt7898]

This is a poorly done conversion