spark plugs

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tinnes2

New Member
Apr 25, 2014
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Wood Dale IL.
I purchased a new NGK spark plug yesterday and the thread portion is longer than the original pretty sure I can't use this or it will hit the top of the cylinder head am I using the wrong plug number I got the number off of one of the performance parts threads it's an NGK B 7 HS the original was a champion J8C
 

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MotorBicycleRacing

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Jul 28, 2010
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I purchased a new NGK spark plug yesterday and the thread portion is longer than the original pretty sure I can't use this or it will hit the top of the cylinder head am I using the wrong plug number I got the number off of one of the performance parts threads it's an NGK B 7 HS the original was a champion J8C
The Chinese spark plugs that come in the kits have too short of a threaded portion.
The NGK B7HS is the right length.

You could also use a NGK BP7HS which has an extended tip and it
won't hit your piston.
 
Last edited:

Goat Herder

Gutter Rider
Apr 28, 2008
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The extended tip will self clean better IME. The small engine shop I worked in put protruding electrodes type spark plugs in all our two strokes. Less likly to foul. Runs stronger on them too from what I saw. Better starts etc.

This is just a generic picture to convey what I mean.
Down closer to sea level I think a fellow may be running cleaner to use ether model I reckon?
 

Goat Herder

Gutter Rider
Apr 28, 2008
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When I look up the specks to just about all our small engines two smoke. Say some of the old chian saws, mini bikes, every thing two smoke pretty much pulls up a protruded model.
I can see some race exeptions like a very close tolerance head perhaps. Even race fuel at that point. ''cooler plug''