Which spark plug should I use ?

[amcf18]

Originally Posted by Dangerouspower

Ok thanks. I will try out a 8. Is there a special tool or some trick to removing and putting the plugs back in besides taking the plastic/gas tank off ?

you dont need to take the tank off, the tool provided in the tool kit will get it out.. You should pry the rubber cover off the plug, then blow air in the drain hole on the side of the head and down the hole if possible to clear dirt away from the plug before removing it...It is a lot easier with the tank off though...

[CFM-Z440]

Originally Posted by SedaliaPowerSports

I have been running the NGK CR8EK and been very pleased 1 plug has been in all season. Dont know what advantages it has if any, just thought I would share.

I've got one of these in my 470 right now. I can't say if it is good or bad, I know it's very little gain if any, but like mentioned earlier, it's worth a touch of compression. I have done a lot of chamber work, so I was looking to gain a little compression back.

One other thing about these, is they move the point of ignition to a little lower in the combustion chamber which is closer to the center of the chamber when you consider the piston part of the chamber. In theory, it may speed up combustion just slightly.