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Old 25 March 2013, 09:11   #1
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Popping sound - Yam 100

Hi,

the engine sounds fine when on tickover or under power however there is an intermittent popping sound. Was wondering whether there was something in the fuel.

All, well nearly all, suggestions gratefully received.

Andy.
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Old 25 March 2013, 13:58   #2
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Sounds like its popping off an cylinder
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Old 25 March 2013, 14:29   #3
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No valve clearance or broken valve spring.
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Old 25 March 2013, 14:52   #4
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Misfire
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Old 25 March 2013, 14:59   #5
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If its a high pitched noise or a squeak, it's usually the bottom crankcase seal. If bottom plug has a Red colour it usually indicated the crank is pulling in water. Leads to bearing damage and partial seizure.
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Old 25 March 2013, 15:43   #6
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Sorry I assumed it was an f100.
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Old 26 March 2013, 04:40   #7
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Quote:
Originally Posted by Davie View Post
Sorry I assumed it was an f100.
Correct.
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