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Primary chain loose. chain from crank to primary shaft CB 900F

raven588

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Norway stavanger
Hi, I have a 1982 CB 900F and I need some help with it.

I had finished building the engine and everything seemed to be perfect. However, when I accelerated, the primary chain (the chain from the crank to the gearbox) slipped. I opened the gearbox and found that the chain was loose and had skipped a tooth.

For the repair, I found a CB 750 engine hoping that the block was the same, but unfortunately, it was not. I was hoping that the chain was the same as the 900F, but it was too short.

I am wondering how long the perfect chain should be. Does someone have a measurement?
 

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