Spark plug for a 416

[chucked]

I just finished my motor with a 416 10.8:1 compression. What kind of spark plug should I use??

[Silverfox@C&DRacing]

ngk dpr9z

[RIDER11X]

Is that different than stock?:huh

[JD400exrider]

That is one of two plugs that is recomended in the honda specs. A cooler running plug.

[Rico]

I"ve read that the plug Dusty posted is for long hard WOT rides like desert racing or dune riding.

I think i might try the plug out in my next XC race to see if there are any differences.

[cals400ex]

i have ran the 9z ever since i put a piston in my bike. the bike may be a bit more cold natured on start ups but i don't have any complaints with it.

[chucked]

there is a drp8z in it now, what is the difference????

[JDiablo]

it is a colder plug i think

[chucked]

Originally posted by 300exrida
it is a colder plug i think

hmm i think it has something to do with the gap maybe???
wasnt there a thread on here somewhere about how to read a plug...

[JDiablo]

i think that might be in the FAQ section

[400exrider707]

lower number is hotter plug

[Silverfox@C&DRacing]

you are correct the 9 is a colder plug which is recommend for a high compression piston.

[chucked]

here we go

http://www.4strokes.com/tech/ngkplug.pdf