SOHC.co.uk Forums > CB750
CB750 F2 Primary chains
archmill:
Hello, Have at last started re-building the CB750 F2 as a cafe racer and started building the engine this weekend. The last time it ran was 1982 and the guy who passed it on to me said it dumped all the oil on his boots so he stuck it in a shed. Have stripped the engine completely so I am starting from scratch.
Measured the primary chains and got a size from the oil pan face to the tensioner of 69mm so I recon they are done. Bike had only 25,000 miles on it.
Where is the best place to get new primary chains and tensioner.
Any advice greatly appreciated.
Athame57:
I'd check out David Silver Spares for something like that. https://www.davidsilverspares.co.uk/
Martin6:
Wear limit spec is 70mm. Does anyone know what this measurement is with a brand new chain?
Athame57:
--- Quote from: Martin6 on April 28, 2024, 10:47:31 PM ---Wear limit spec is 70mm. Does anyone know what this measurement is with a brand new chain?
--- End quote ---
If you place a primary chain upright and the top row sags to contact with the bottom row the chain is finished. As to how close you'll let it come to that I guess is up to you.
Nurse Julie:
--- Quote from: Athame57 on April 28, 2024, 11:17:04 PM ---
--- Quote from: Martin6 on April 28, 2024, 10:47:31 PM ---Wear limit spec is 70mm. Does anyone know what this measurement is with a brand new chain?
--- End quote ---
If you place a primary chain upright and the top row sags to contact with the bottom row the chain is finished. As to how close you'll let it come to that I guess is up to you.
--- End quote ---
George, that only works on Hyvo primaries, like the 400/500/550's. 750 chains are different, they are not Hyvo, they are a lot thinner and there are 2 of them, side by side.
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