Does anyone know if performance spark plugs make a difference? My motor has been modified to 106 inches, 9.5:1 compression. Bike runs strong with 103 HP and 110 lb TQ. However, I do notice some engine pinging when I hit the throttle wide open - usually in 5th gear to pass, say from 70mph to 80mph. I think more noticable on hot days. I run the highest octane gas I can find.

Wouldperformance sparks with a lower temp range help with the detonation? Or is this all hype?

Thanks
Norfolk88
2006 Softail Standard
106 inch
Rinehart 2 into 1
Riveria Pro-Clutch

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I don't think "performance" plugs make a damn bit of difference. I've got a 95" build with hp/tq similar to yours. Once step colder Autolite 4163 work great.
Less than $2 ea.

 

ya go a temp cooler (usually a larger number) and maybe need a bit more octane?? you runnun 91 i presume. that high compression combined with the heat of a really hot day can easily cause low oct fuel to pre-ignite. i know it 2-strokes this pinging in excess can burn a hole in the piston. i dont think yer there by any means but try the cooler plug and then maybe add sum oct boost the next tiem you fill up.

 

av lite fuel is about 101 oct that might be your ticket but kinda a bit$h if you ride alot, cuz you have to go to the small airports to get it. or buy race gas (110oct) and mix with 91 pump. 2 gallons race gas to 3 of 91 makes about 100 oct. its aveages in case your wondering how to get the number. so find a oct level that works sounds like you need just a lil more and the plug just might get you there.