Topic: 1981 CB900F

[vozzy]

1981 CB900F. Bought as a work bike. 22K miles. All original except paint. Sounds like cam chain(s) is rattling, plus there is popping in exhaust when reving. Think I need to sync carbs and adjust chains. What will cause the popping?

[nixonwylie9]

I would check the ignition timing probably not firing right
good luck

[nixonwylie9]

and plugs and plug gap so on

[grcamna2]

Have you cleared out the tank/carbs. yet. ?

[vozzy]

I ran some Seafoam through tank. Need to change plugs out ASAP. Cheap insurance

[grcamna2]

I recommend removing the carbs. and cleaning out All the passages and flushing out the tank to remove the fine sediment on the bottom of it that will clog you're small passages in the carbs.

[cb650]

If you decide to upgrade the shocks I'll take the old ones off you.

[vozzy]

Upgrade? They look pretty good stock. Reservoirs and everything!

[cb650]

Yes upgrade.    I have plenty that "LOOK" good but perform like a turd.