What spark plugs?

[ToddW]

I'm wondering what would be the proper spark plugs, and gap for my engine:

701, mild port job, dual 44s, b pipe, 165psi in each (still
have to re-test but in that region),

Thanks

-Todd

 

[keefer]

What head are you running? If it is stock you have to run the "H" series short thread plugs. Most run BR8HS or B8HS on stock heads. Most all aftermarket heads take the long thread "E" series plugs, BR8ES or B8ES. Usually the gap is about .028 to .030

 

[Waste Land]

BR8HS - Stock Head
BR8ES - Most aftermarket heads

 

[keefer]

Welcome to 5 minutes ago:doh:

 

[ToddW]

Sorry guys, it's a Greater Yamaha Girdled Head.

 

[keefer]

Run BR8ES if you have the stock or MSD plug caps. If you have the NGK resistor caps then run the B8ES. The resistor will cut down on RFI that can interfere with digital ignitions and other electronic devices that may be near you.

 

[ToddW]

So, gap the BR8ES between .28 and .30 ? I thought I read someplace else it was .24 to .28?

What's the difference between gapping?

 

[RideItLikeYouStoleIt]

They come pre gapped and cost $3. if you need to check gap throw them away.

 

[ToddW]

They come pre gapped and cost $3. if you need to check gap throw them away.

They come pre-gapped... eh? I've never gotten any plugs that came pre-gapped are you SURE?