NGK CR8,9 or 10EK Plug

[440rider]

Seeing what plug everyone runs, why and what the difference is between the three.... I have heard the 8 wont foul as much as a 9 but a 9 runs hotter and is a better plug, does anyone have experience with a 10? Manual calls for a 9EK...Tks

[badvox]

I understood that the 8 was a 1 step hotter plug so by that then the 10 would be one step cooler than stock.

Yes? No?


mike

[cdalemx301]

I run a 9...Local guy told me they used to race and run strictly 8 well I put an 8 in and flames come shooting out my exhaust and so does a bunch of flaming packing...So i immiediatly went back to a 9 and now run perfectly fine...

[MyCannibal]

i usually swap plugs in between winter/summer...one runs hotter then the other.....i've ran both all year round though....doesnt really matter...

[Canniboomer]

The MX400, FX400 and X440s owners manuals, 2001 print, say 8. The 2002 and 2003 Engine parts catalogs say 9, but then indicate the same Wiseco piston, while the 2002 ATV Owners manuals says 10?... The 2003 Bike Manual says 9.
sheesh!

And I wonder, has anyone ever seen a number 10 plug come out of a factory Cannondale?

[MyCannibal]

never knew anything about a 10...?

[MyCannibal]

by the way mines an "early"02 and doesnt say anyhting about a 10....i believe it calls for a 9.

[Canniboomer]

2002 ATV Owners Manual, part 6001025, page 162.

probably a typo?

[440rider]

you are absolutly right it does say ngk (cr10ek) in manual. I have a 10 at home I need to adjust my settings and put a new plug in so i'll give a 10 a shot.

[Canniboomer]

Is there even a Cannondale part number for a CR10EK?.... you might be the first.