Flathead plug choices

flattop1

Dawg 89
Champion L76v.
UL 77 v is another
Also L78v
 

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J19 or BPMR6A is nice for gas and its short height, especially on a minibike running a girdle.
Autolite 292 or 411 is solid.
NGK BU8H for alky are about all I use.
 
Yea the j19 wont foul out for sure. Hot plug .
The 411 i like best .
The no ground strap caused a dnf once so there out or i blame it .
The ngk is a surface gap also , right ?
For the tiller anything that sparks .
 
Denso ND W24 FS-U
Standard plug for flathead stockers on alcohol.

I am not a fan of surface gap plugs due to their tendency to foul - although I realize it is much simpler for the end user who does not wish to index their plug.
I will take the plug mentioned above and customize the ground strap so it ends up being a side ground.
I have been very happy with this plug for ~30 years now after changing from the 411.


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Denso all day either type of fuel. I have been running and cleaning and running this same w16FS-U for almost a year now since I discovered it. Before I was sold on NGK but I'll never look back. Am curious about the Brisk though they look strong.
 
I'll bite whats a Silverstone ?
Silverstone is made by a company called Beru out of the UK and sold through Nology. I have to look on the box for the number but they only make 1 plug that fits a flathead Briggs. Solid silver core and a much stronger spark than a standard copper core. EC was very high on them back in the day. Have never manged to foul one personally. They are not cheap though and getting harder to find.
 
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