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GT186 kit. What plug should I be using

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GT186 kit. What plug should I be using

Postby 69GP225 » Sun May 08, 2022 5:17 pm

Hello.

I’ve done about 550 miles on a new gt186 kit. Running 5 speed box. 30mm carb.
Running original Ron moss pipe.
Should I be thinking about changing the type of plug ?

I’m running denso W24ES-U. I looked at the plu and running a little rich as been running in.

Thanks for the help!
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Re: GT186 kit. What plug should I be using

Postby vegansydney » Sun May 08, 2022 5:59 pm

The GT manual recommends a NGK B7ES as a starting point.

Personally, for any Lambretta application that requires an NGK 'ES' plug I'd prefer to substitute it for an 'EG' type.
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Re: GT186 kit. What plug should I be using

Postby 69GP225 » Sun May 08, 2022 6:37 pm

Thanks buddy

What’s the difference with AG plugs?

Thanks Lee
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Re: GT186 kit. What plug should I be using

Postby ULC Soulagent » Sun May 08, 2022 8:54 pm

G denotes racing
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Re: GT186 kit. What plug should I be using

Postby MickYork » Sun May 08, 2022 9:34 pm

The EG type is the one with the thin center electrode while the ES has a standard center electrode. The EG is less prone to plug fouling and has (allegedly) a stronger spark hence better combustion.

The EG are quite a bit more expensive than the ES.
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Re: GT186 kit. What plug should I be using

Postby Fast n Furious » Sun May 08, 2022 11:44 pm

Champion N3G would be my recommendation. Always found them to give very good service and longevity.
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Re: GT186 kit. What plug should I be using

Postby vegansydney » Mon May 09, 2022 12:09 am

MickYork wrote:The EG are quite a bit more expensive than the ES.


Here in the US the NGK EG plugs are between $1.25 - $3.50 more each, depending on where you buy, and if individually, or in a box of 4. IMHO it's worth the extra coin.
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Re: GT186 kit. What plug should I be using

Postby coaster » Mon May 09, 2022 10:51 am

69GP225 wrote:Hello.

I’ve done about 550 miles on a new gt186 kit. Running 5 speed box. 30mm carb.
Running original Ron moss pipe.
Should I be thinking about changing the type of plug ?

I’m running denso W24ES-U. I looked at the plu and running a little rich as been running in.

Thanks for the help!


I use the same Denso plug in my GT240, its the equivalent heat range to the BS7 but Denso plugs are not cloned so you dont caught out if buying from ebay. Ive had several NGK plugs fail over the years but never had any issues with Denso.
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