adv timing key

[81 clark racing]

has any1 instaled a adv timing key for a 400ex ? what did it take to instal ? was it easy and about how long did it take you. also do you feel a difference? i have full pipe, air filter, jet kit, and icat spark enhancer thanxs steve

[Roman]

Here's a start. I'm interested in one myself though and am looking foward to reading more.

Timing Key Article (http://www.atvriders.com/articles/timingkey400ex.html)

Roman

[81 clark racing]

yea i found that after i posted it but i wana no if it will work good with my mods

[oldskoolex400]

good as long as you dont go with a big bore or high comp because the key advances the timing which in turn makes it burn hotter so to me it seems like it wouldnt be good seems like wiht the mods you have it is a good idea

[Green95Hoe]

hmmm. i have a 426 and an 11:1.. I run race gas though so I wonder if I could get away with it??

[oldskoolex400]

i dunno depends on what octane your running im guessing im no expert on this but if sparks said only to run it on stock engines i believe i would listen to him but hey if you decide to do it tell me what happens to your 400 and how much hotter it ran

[guinness77]

oonce you see one, you'll see why Sparks doesn't recommend it for anything over a 406! It's really shaved off. I noticed an increase in mid to high end performance. My quad was stock except for a Moose Works Stage 2 power up jet kit, K&N filter, and WB E-Series pipe. I was having detonation with 87 octane gas, so I went to 92 and the machine performed well. I went to 104 and it performed really well... but started running a bit warm. So I stuck with 99.

We had to split the case a little while ago and noticed a large amount or pure white deposits on the valves and crown of the piston. The mechanic didn't know what to make of this and neither did anyone else. So I pulled the timing key and had the thing bored to a 402 (and a few other things). Hope it works out.

[gixer_boy99]

I have a 416 with 11.1 compression with the key and I Like it alot and havent had any problems with it...