Author Topic: Cbf surging revs  (Read 642 times)

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Offline Nijman

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Cbf surging revs
on: 18 May, 2019, 05:03:38 PM
I have a an 09 cbf 15000 miles no blinking on the fi light

The bike will surge by 500revs up and down when trying to hold steady 3000rpm while in neutral.

2 plugs brown and 2 white suggesting bike is running lean on 2 cylinders.

Exhausts sounds blowy.

Same symptoms exist on tick over.

Cylinders affected appear to be both offside

Wondering if anyone has had these symptoms .and managed to fix.



Online Art

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Re: Cbf surging revs
Reply #1 on: 18 May, 2019, 09:15:21 PM
Insufficient fuel

Caused by restriction in fuel lines and/or fuel injectors or, a vacuum leak or, anything that could cause a lean fuel mixture. Your half way there having identified cylinders 3 and 4 are running lean.
Last Edit: 18 May, 2019, 09:20:53 PM by Art