sparks +6 key and Jetting

[Jcbowhunter]

I just installed the key in my 400ex. should i step up a size or two on my main jet now?

[dxcody]

You will just have to take it out for a test ride. Top end is what you will want to check, it will probably be a little leaner than before. Top it out a few times, and pull the plug.

You will probably have to bump up the main a couple sizes.

I think i read that a +6 will cause the top end to run a little lean, but there was some debate over if it does or not.


Just do a nice test ride and pull the plug.

[honda400ex2003]

you shouldnt have to rejet but keep an eye on it anyway while riding.

temps in general will run a bit hotter than they would with the stock key in there. expect to see about 10-15 degrees hotter on oil temp commonly with as high as 20 degrees in some cases if riding hard.

its not a big deal if you keep an eye on it though,
steve

[Jcbowhunter]

Thanks guys. Im used to big motors and im trying to learn this stuff. I didnt know about increasing the jet size, because i know that on my v-8 race motors i can usually put more fuel through it when i crank the timing up.

[Drfat400ex]

Where did you buy one of these? I looked at sparks racing website and couldn't find it.

[honda400ex2003]

sparksracing.com
- products
- honda
- 400ex
-electrical
-first one on the page


that should get you where you need to be.
steve

[Drfat400ex]

ahhh, silly me I didn't look in electrical. "facepalm"

[honda400ex2003]

that will get you every time lol.

steve

[Jcbowhunter]

32.00 shipped! Thats the killer! but it really woke it up!

[Crosshairs]

I have the sparks key sitting on my desk for about 4 weeks now...I really need to get off my lazy butt and install it...:)