The Zephyr Zone

Don't know if you resolved this issue but I've just put a new clutch in mine. Same mileage as yours. The old clutch wasn't completely dead. But I had used motul semi synthetic and had changed to that approx 500 miles ago. I'm using silkolene now as that was recommended. But if it slips again I'll be...

Morning. Hope someone can tell me what size bolt is in the clutch cover case? One is stripped but I'm not good with sizing. M4? M5?