Spark plug and gap.

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Tony7868+
Posts: 3
Joined: Mon Aug 12, 2024 2:34 pm
Location: Plymouth devon

Spark plug and gap.

Post by Tony7868+ »

Hi everyone,
I have a forty feather weight Seagull engine with a serial number of EGF85HH1, please can anyone tell me what spark plug I need and the gap size .
Thank you in advance .
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Collector Inspector
Posts: 4194
Joined: Sun Jun 29, 2008 4:32 am
Location: Perth Western Australia
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Re: Spark plug and gap.

Post by Collector Inspector »

I have no idea why you have not investigated this site.....I refer to "frequently asked questions" and other links.

Standard available now, anywhere , Champion D16.

Gap? .... well start at 0.025".....adjust up or down for best operation for your engine on a transom.....NOT in a bucket aye.

If you have oiling plug problems....D21 is hotter and takes care of that.

NGK NO!

CI
A chicken is one egg's way of becoming others
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Charles uk
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Joined: Wed Feb 27, 2008 4:38 pm
Location: Maidenhead Berks UK

Re: Spark plug and gap.

Post by Charles uk »

On a 1981 motor if it hasn't been fixed before, you would expect to find a flywheel that has no groove on the outer diameter,

this would imply your motor is fitted with a Mk 3 Wipac CDI (with white electronic components) these have a standard. plug gap of 35 thousands of an inch

If your flywheel has a single groove it is fitted with a Mk 4 Wypac CDI ( dark brown electronic component) with a 25 thou plug gap.
Make it idiot proof and someone will make a better idiot.
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Collector Inspector
Posts: 4194
Joined: Sun Jun 29, 2008 4:32 am
Location: Perth Western Australia
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Re: Spark plug and gap.

Post by Collector Inspector »

Yes Charles, correct as always.

Thing is the answers to this question do centre on what ignition.

The original poster has provided a serial but no details as what the ignition is?

No pics.....a sad thing for trying to help aye.

No pics detail of the motor either?

I think that a real board such as this, and others, get sidelined for real information because of SM?

Doing research seems to have gone bye bye?

Nuts.

B
A chicken is one egg's way of becoming others
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