High Compression head spark plug?

Lukesky36

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Joined
Oct 3, 2018
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316
Can any of you give me some recommendations for a NGK sparkplug? It is a high compression head so i believe the plug has too have smaller reach?
 


Spare_Parts

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Nov 29, 2017
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993
Fred head takes the stock size. Don't know about the others. What head do you have? That would be useful.
 

Lukesky36

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Oct 3, 2018
Messages
316
Fred head takes the stock size. Don't know about the others. What head do you have? That would be useful.
Yea i know for a fact the stock kit plug will work just wondering if there is a ngk version that doesn't protrude into the chamber and yes its a Fred Head
 

Spare_Parts

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Nov 29, 2017
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993
I don't think any of the threads protrude on mine. Now I'llhave to check when I rebuild the engine.
 

Lukesky36

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Oct 3, 2018
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316
I will be getting the head next week ill take the head to a store and try some plugs and see what works ill post the plug-s that works for future reference for people
 

Will'smotobikes19

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Apr 9, 2018
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1,356
I run a B5HS but really any NGK plug is better than the kit spark plugs. As long as it's long enough but not too long it should be fine.
 

FNTPuck

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Jul 2, 2018
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349
Most of the Fred heads are the opposite - the plug does not protrude enough past the threads and is shrouded. The proper fix is to mill down the top of the plug boss, but most just run an extended plug.
 
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