I have a clutch that slips. It is a Norman Hyde supplied 7 plate item. I stripped it today to inspect the plates and it does not appear to have much wear at all but I cannot be sure.
However, the spring retainers were not screwed down very far so when I put it all back together I set it up, as per the workshop manual (the screws are also now roughly flush with the retainer outer faces), and making sure the cover plate was level (slowly turning the engine and using a dial gauge).
Took her for a run but whilst a little better, she still slips at high revs, full throttle, under load in 4th and 5th. So, I am wondering snout my options:
1. I can try screwing the retainers further in (but they are close to binding).
2. Fit stronger springs (have tried both T120 and T140).
3. Get a new, quality 7-plate clutch.
4. Find/buy an uprated/competition clutch.
For context: My engine is strong. PO had the engine built up with balanced crank, line-bored mains, corrello forged rods and pistons, gas-flowed competition head, Hyde tappets, Hyde half-race cams, alloy barrels and PR
tubes, lightened push rods, 1.5 headers, Norton non-baffle pea shooters and other bits n bobs. A rolling road printout, in the pile of receipts I got with the bike, shows 61.8bhp at the crank. Not bad from a 40 year old archaic twin 🙂
So, do I need a stronger clutch and if so, can anyone recommend one please?