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Spark plugs

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Hi guys.

Just wondering at what intervals do you change plugs?

I have the 383 HH motor with 375 hours. The last outing I noticed a stronger smell of gas and the engine running a bit rougher (more vibration at idle at the steering wheel).

I'm wondering if one of the plugs may be fouled and causing the engine to run rougher?

The ambient temp was around 110 degrees. Will that make an engine run richer?

I'm thinking about replacing plugs and fuel filter. Anything else I need to consider?

Also, do these motors need timing adjustments?

Thanks in advance.

Edited by mcbean7
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