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82 cb900c poor idle, need some advice

Old 07-13-2018, 08:16 PM
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Icon5 82 cb900c poor idle, need some advice

Hope you guys can help.. I own a cafe racer 82 cb900c rebuild engine( taken apart cleaned pistons, cylinders and valves and put back together) , with dynojet rejeted stage 3 carbs, 4 to 1 exhaust, individual air filter pods. new boots and the idle is really poor. I makes the exact same noise at the bike on the link below. some type of misfire on the cylinder 1.. Hope i can get a few advice from you guys. Thank you!


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Old 07-28-2018, 04:28 PM
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Default Re: 82 cb900c poor idle, need some advice

Does it smoke while it does that?
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Old 07-28-2018, 05:02 PM
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Default Re: 82 cb900c poor idle, need some advice

yes it does
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Old 07-28-2018, 05:08 PM
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Default Re: 82 cb900c poor idle, need some advice

Change your valve seals and lap your valve seats.
I had a seal go out and it was dumping oil into cylinder 4. Rough idle, cooler exhaust temperature and smoke from the bad cylinder.
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Old 07-30-2018, 04:10 PM
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Default Re: 82 cb900c poor idle, need some advice

Oh ok ok! We came to the conclusion that it was a valve problem as well. We reajusted and changed the seals. also the timing chains as well.
Thank you. I will let you know if I have more questions!
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