SOHC.co.uk Forums > CB350/400
Clutch siezed
Athame57:
--- Quote from: Mikep328 on August 14, 2024, 10:27:05 PM ---Seemed odd - the bike sat for 5 months while we were in the USA and the week I got back here I rode it - no sticking clutch. Then it sat for 4-5 weeks and had a sticking clutch. I don't understand the dynamics! One of those mysteries, I guess!
--- End quote ---
Could it be the oil you were using?
Mikep328:
It was the same oil - I had changed it last November before we left the UK; didn't change it when we arrived in late April and no sticking clutch at that time. Hard to believe the oil would be fine after 5 months and then go "bad" 5 weeks later.
I'm not particularly concerned that it happened since it's easy enough to "fix" when it occurs just wanting to understand it; I like knowing why something happens! ;)
taysidedragon:
--- Quote from: Mikep328 on August 15, 2024, 07:04:49 AM ---It was the same oil - I had changed it last November before we left the UK; didn't change it when we arrived in late April and no sticking clutch at that time. Hard to believe the oil would be fine after 5 months and then go "bad" 5 weeks later.
I'm not particularly concerned that it happened since it's easy enough to "fix" when it occurs just wanting to understand it; I like knowing why something happens! ;)
--- End quote ---
It could be some contamination in the oil after riding it compared to clean, new oil before?
McCabe-Thiele (Ted):
Coild it be connected with the age of the clutch plate material, I fitted new plates when I rebuilt my 400, clutch did not sick in the last two winters?
Mikep328:
Can't see how the oil could get contaminated in a couple of short rides - still looks clean on the dipstick - same as out of the bottle.
Clutch discs are old, I assume, maybe original. Bike only had 14,000 original miles based on MOT records/rebuild info. No record of them being replaced when the engine was rebuilt in '22. There are receipts for everything else done to the engine so I'm sure if the clutch discs had been replaced there would be a notation for that.
That being said, clutch works great. It engages smoothly and there is no slippage at all. So as doctors say nowadays, "We'll monitor and note any changes!" :)
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