[Fot] TR4 Spark Plugs

[Robert Deanes]

The NGK BP8HS-10 is a marine plug used in most Yamaha engines.....BR8HS-10
is the Resistor plug....but they work great in TRs also....I run that same
plug in my TR-4 racer and I am happy with it....works great in  boat too !

On Mon, Oct 22, 2012 at 11:45 AM, Scott Janzen <sjanzen at me.com> wrote:

> I am prepping the recently acquired TR4 for the Turkey Bowl at Summit
> Point (Thanksgiving weekend) and thought I would get some new plugs.  The
> current plugs are NGK BP8HS-10.  These come up in google searches as being
> used for marine applications, though there's nothing in the part number
> that indicates that use.
> Engine is about 170 psi compression, 12:1, guessing from the cam that the
> engine will be running between 4,000 and 7,000 RPM.  Plugs are running
> light-medium brown, so apparently about the right heat range.
> Recommendations for plugs, or should I stick with what I've got?
>
> Here's the current spec:
> non-resistor plug
> Thread Size: 14mm
> Thread Reach: 12.7mm (1/2")
> Hex Size: 13/16"
> Heat Range: 8
> Gap: 1.02mm (.040")
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-- 
rob deanes
TR Racer