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354 spark plug fouling


 
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WNM
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PostPosted: Sat Oct 17, 2020 11:46 am    Post subject: 354 spark plug fouling Reply to specific post Reply with quote

I"ll get this right yet!!

Recently purchased 354 which fouls plugs very quickly The carb is the British Zenith VN which I was told recently rebuilt I replaced the air filter and there is no problem with the choke working correctly I understand there are shims below the fuel inlet which adjust the fuel level? I have never worked on a carb like this so any information will be appreciated

Thanks
 
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Roger in Iowa
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PostPosted: Sat Oct 17, 2020 2:16 pm    Post subject: Re: 354 spark plug fouling Reply to specific post Reply with quote

Are the plugs fouling from fuel or oil? Is the engine smoking? Blue smoke or black? Blue is from oil. Black is fuel.
 
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WNM
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PostPosted: Sat Oct 17, 2020 3:18 pm    Post subject: Re: 354 spark plug fouling Reply to specific post Reply with quote

[quote="CVPost-Roger in Iowa"](reply to post at 15:16:26 10/17/20) [/quote]

Definitely fuel They are a sooty black within a few hours of use First thing I though of was a rich mixture but an adjust made no difference Thats why I thought maybe float level is too high
 
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old
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PostPosted: Sat Oct 17, 2020 4:17 pm    Post subject: Re: 354 spark plug fouling Reply to specific post Reply with quote

What brand of spark plug does it have in it?? Also it could be a plug tht is to cool. Me I use NGK plugs in every thing since now days Champs and auto lite plugs are junk and made in the land of almost right
 
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WNM
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PostPosted: Sun Oct 18, 2020 6:54 am    Post subject: Re: 354 spark plug fouling Reply to specific post Reply with quote

[q

uote="CVPost-old"](reply to post at 17:17:09 10/17/20) [/quote]

Pulled NGK' out of it Tried Champ L90C and Autolite 425 All 3 had the same results

Thanks
 
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PostPosted: Sun Oct 18, 2020 7:06 am    Post subject: Re: 354 spark plug fouling Reply to specific post Reply with quote

Try one or 2 grades hotter plugs and see if that helps
 
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WNM
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PostPosted: Sun Oct 18, 2020 7:12 am    Post subject: Re: 354 spark plug fouling Reply to specific post Reply with quote

[quote="CVPost-old"](reply to post at 08:06:54 10/18/20) [/quote]

Will give it a try Keep you posted
Thanks
 
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bc
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PostPosted: Sun Oct 18, 2020 11:29 am    Post subject: Re: 354 spark plug fouling Reply to specific post Reply with quote


I don't know but black soot on the plugs makes me think of an exhaust valve or timing issue. A rich fuel mixture will usually leave a black wet looking plug.
 
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PostPosted: Sun Oct 18, 2020 12:03 pm    Post subject: Re: 354 spark plug fouling Reply to specific post Reply with quote

I've seen a plug both ways wet or sooty. Sooty just means the plug is still firing. Wet means the plug is gas fouled and not firing
 
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WNM
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PostPosted: Mon Nov 23, 2020 12:22 pm    Post subject: Re: 354 spark plug fouling Reply to specific post Reply with quote

[quote="CVPost-old"](quoted from post at 08:06:54 10/18/20) Try one or 2 grades hotter plugs and see if that helps[/quote]

Wanted to get a few hours run time before posting a reply Went one step hotter and installed a hotter coil to go along with the electronic ignition that was in there Definitely an improvement

Thanks for the help
 
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