SOHC.co.uk Forums > CB750

A stupid mistake.

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hairygit:
Sorry about that Roy, didn't read the whole post, just looked at the pics! :-[ Any other Honda four what I said would be true, seen it a few times where bikes have been stood for a while and the case hardening has broken through, and on more than one occasion I've had desperate calls from people at gone midnight because they've lost all drive in the middle of nowhere :o. So glad for you that it wasn't the case. But, before rebuilding your 350, do check that shaft for corrosion, far easier to replace if necessary before putting the engine together and in the frame. Oddly enough I've seen a few very rusty ones for sale on fleabay lately, and some mug bought them! (Although it may have been someone like Ashimoto, with the ability to clean and re-harden properly)

UK Pete:
Blimey roy these bloody old bikes are a constant battle, always problems of some sort, wether self inflicted or not
pete

royhall:

--- Quote from: hairygit on July 25, 2015, 02:35:10 PM ---Sorry about that Roy, didn't read the whole post, just looked at the pics! :-[ Any other Honda four what I said would be true, seen it a few times where bikes have been stood for a while and the case hardening has broken through, and on more than one occasion I've had desperate calls from people at gone midnight because they've lost all drive in the middle of nowhere :o . So glad for you that it wasn't the case. But, before rebuilding your 350, do check that shaft for corrosion, far easier to replace if necessary before putting the engine together and in the frame. Oddly enough I've seen a few very rusty ones for sale on fleabay lately, and some mug bought them! (Although it may have been someone like Ashimoto, with the ability to clean and re-harden properly)

--- End quote ---
First thing I did was double check against an F2 output shaft for sale on eBay and that was stepped the same, then straight to the 350 to check that. Fortunately its like new (weird really as the rest of the bike has been a mess). See what you mean though about the case hardening as the 350 sprocket isn't trapped tightly and can move slightly. Shouldn't be as bad on the F2 as the sprocket bolts up tight and cannot move at all.


Your right Pete, they can be a pain. Part of the fun though (sometimes). Cant blame this one on anything else though, my error completely.

Spitfire:
That's one for the memory bank !

Cheers

Dennis

royhall:
Just been to the Isle of Man on the old Blue F2. Whilst there it started to make a knocking noise that I could also feel through the left footrest. When I got home I had a good look at the chain and sprockets, they seemed worn and I thought they were causing the issues. I have had this bike for a few years and done thousands of miles without a hint of a problem until now.

When I took the covers off guess what, the PO had fitted the engine sprocket the wrong way round. It had really had a go at the crankcases.
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Guess this is a very common thing. If your running an F2 have a look at the inside of the chain for signs of wear. You never know.
New chain and sprockets now fitted and no lasting damage done.

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