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rockwilda1089
05-04-2004, 08:48 AM
If your sparkplug is not properly gapped, does it hurt the bike, or just affect it's performance?
zephead400ex
05-04-2004, 08:51 AM
Yes. If not gapped correctly you wont get good spark. Get a gap tool, very handy and very cheap:D
rockwilda1089
05-04-2004, 08:55 AM
next question....does anyone know the proper gap size for the sparkplug and valves on an 03' 400ex
zephead400ex
05-04-2004, 09:26 AM
.06. - .07
04'400ex'er
05-04-2004, 11:03 AM
Originally posted by zephead400ex
.06. - .07 I dont think that is right. mine is gapped at .035 and it runs fine.
rockwilda1089
05-05-2004, 09:04 AM
what about the valve spacing? does anyone know that?
04'400ex'er
05-05-2004, 11:36 AM
Originally posted by rockwilda1089
what about the valve spacing? does anyone know that?

There is a tech article on this site about setting valve clearances. It should say the clearances.
zephead400ex
05-05-2004, 12:02 PM
Originally posted by 04'400ex'er
I dont think that is right. mine is gapped at .035 and it runs fine.

.60 - .70 mm is the suggeted gap. I have always ran with this gap and it works fine.
cals400ex
05-05-2004, 02:34 PM
.6-.7mm is correct. NOT .06-.07.

some of you are referring to inches which would be equivalent to .024-.028 inches.
04'400ex'er
05-05-2004, 04:05 PM
Originally posted by cals400ex
.6-.7mm is correct. NOT .06-.07.

some of you are referring to inches which would be equivalent to .024-.028 inches.

I was reffering to inches. sorry for the confusion. I have had my plug at .35 and it runs fine. It's not the stock plus though.