Charred inlet rubbers

  • Andyp62
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Charred inlet rubbers

12 Jun 2025 07:54 - 12 Jun 2025 07:55
#913652
Hi all
i just removed my carbs to cure a petrol leak and found the two right hand rubbers on nos 3and 4 cylinder are burned badly, they are only a few months old, replacement parts from zpower, timing is spot on and bike runs very well, any ideas? I’ve never seen this before(, I did re set timing a couple of weeks ago as it was running a bit rough ]
1978 Z650 B2, US import to the UK
Last edit: 12 Jun 2025 07:55 by Andyp62. Reason: Wanted to add it is a 1978 z650B2 us import to the uk

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  • Wookie58
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Re: Charred inlet rubbers

12 Jun 2025 08:00
#913653
I would say that the fuel that was leaking was flooding the airbox which has subsequently ignited (lucky the bike didn't catch fire) ignition blowback in the airbox would normally be a "timing" issue or an inlet valve not sealing (tight valve clearance etc)
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