Who has done the Blue wire mod??

[Raven1911]

How many of you have done the blue wire mod and if so did it help the starting much? My 426 pretty much starts well but not sure if I should do this or not?

[YZLEE]

I did it and it made it a little easier. But, after I did the 450 cam mod, I put the blue wire back. It's a neutral rev limiter and having it out kind of bothered me.

[642MX]

It did nothing for me, so I hooked it back up.

[myoung]

Did the cam mod on mine so didn't need to cut the wire. Have read both sides though here on TT. Some say it helped, others say it did nothing. I wouldn't bother.

[felony]

yeah i cant tell a difference.

[Raven1911]

Thanks, doesn't sound like I will be trying it then. My bike starts pretty well. I have heard though that someone makes a YZ426 cam mod instead of the 450 as I have heard the 450 cam mod messes with the jetting and is not as good???

[Satch0922]

as I have heard the 450 cam mod messes with the jetting and is not as good???

absolutely false......

[myoung]

Hot Cams makes a replacement cam that gives more performance than the stock 426 cam as well as adding the auto decompression. If anything you would have to rejet for that.

The 450 cam went into my bike with no rejetting and also gave some performance gains. The 450 swap was never intended as a performance cam swap, but strictly a way to add auto decompression to the older models. The slight performance gains were just a bonus.

The fact that it took forever for Hot Cams to get an aftermarket cam available allowed the 450 swap to get a foothold on the market. I gaurantee you there are way more people running the 450 cam than the Hot Cams and so far there have been zero complaints. However, there are still some people in denial though, and anything resembling "backyard' engineering scares them. They'd rather wait until a 'correct' replacement is available. That's fine for them, but some of them also have a bad habbit of bad mouthing what they don't understand.

[Satch0922]

but some of them also have a bad habbit of bad mouthing what they don't understand.

no kidding....and every day the 400-426F bikes get older and older so it will soon be a non issue....

[odlaw19]

....and every day the 400-426F bikes get older and older so it will soon be a non issue....

They aren't gone yet.... and wont be forgotten!!!!!!!

Waldo

YZ426

[BIGBLUEKNIGHT]

what is the blue wire i have heard of the gray wire

[WheelsUp]

Blue wire is the neutral sense.

It tells the CDI that you are not in gear, which cuts the rev limiter to, IIRC, 7k, and it also reduces the voltage to the primary side of the coil.

Supposedly, cutting it (thereby increasing the voltage available in neutral) makes for easier starts. It has NO impact on in-gear tuning or performance.

Wanna see if it'll do you any good? Start it in neutral, then pop it in gear and start it in gear. That's the difference you'll get with starting.

[Satch0922]

They aren't gone yet.... and wont be forgotten!!!!!!!

Waldo

YZ426

true ....true

[myoung]

Wanna see if it'll do you any good? Start it in neutral, then pop it in gear and start it in gear. That's the difference you'll get with starting.

Sorry to sound dumb, but I'm not sure what you're saying here. My bike starts similar to a two stroke in either neutral(1 to 3 kicks) or in gear with the clutch pulled(1 to 5 kicks), i.e., a little more difficult in gear. Where would cutting the blue wire help me?

[WheelsUp]

You're probably a little more difficult in gear because the clutch isn't completely letting go... and that's not uncommon.

If you're starting on 1-3 kicks in neutral, you don't need to worry about the blue wire.

[yz_for_me]

I did it and didn't really notice much of a change. It didn't hurt anything either so what the heck.

[bxrjim]

The change I noticed in disconnecting the blue wire was as the weather got colder the bike was a little more fussy starting in the mornings, unplugged the wire and it started first kick in 32 deg. weather.

[kid on a 426]

They aren't gone yet.... and wont be forgotten!!!!!!!

?

Waldo

YZ426

LONG LIVE THE 426!!!!!!!!!!!!!!!!!!!! ?

[cowboyona426]

IMO, don't waste your time. I never did it on my 426 and my bike started just fine.

[DrThumper]

I did the blue-wire mod...couldn't tell much of a difference. Also did the mod that removes that goofy gear position switch, and covered it with a cool blue anodized plate (Zip Ty Racing). May have knocked an ounce off the bike, but other that that, can't really tell...maybe it starts easier, never had a problem there.