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stmpjumper01

Gray wire mod

37 posts in this topic

What is the gray wire mod? I've got a YZ and YFZ, both 04. Which bike can I do it on? I bought a YZ carb and put it on the YFZ, and they are jetted the same. It looks like they both have gray wires in the bundle of wires going to the TPS. Will it work on both and what are the benefits?

Stumpy

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The gray wire on the WR is what controls the rev limiter. If you cut it, it makes it run at the same level as the YZ. I have never had a YZF so i cant tell you for sure if it the YZF has the same gray wire. I'd say go to the YZF forum and ask a couple of the guys there.

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The gray wire on the WR is what controls the rev limiter.

Where do you get your information??!!!??? :thumbsup: It absolutely DOES NOT control the rev limiter. The CDI essentially has two ignition maps, a YZ version for use when the WR has an uncorked exhaust , opened airbox and YZ throttle stop. The second version of the map is for corked up, non free-modded bikes. It retards the ignition timing in the mid and upper rev range to compensate for the de-tuned condition the bike comes in from the factory. Once you free mod the bike, you cut the grey wire to allow for the increased fuel and air the bike is now pumping. Cutting the grey wire is for use on the WR, not the YZ, but if you want to cut it... :thumbsup:...SC

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Where do you get your information??!!!??? :confused: It absolutely DOES NOT control the rev limiter. The CDI essentially has two ignition maps, a YZ version for use when the WR has an uncorked exhaust , opened airbox and YZ throttle stop. The second version of the map is for corked up, non free-modded bikes. It retards the ignition timing in the mid and upper rev range to compensate for the de-tuned condition the bike comes in from the factory. Once you free mod the bike, you cut the grey wire to allow for the increased fuel and air the bike is now pumping. Cutting the grey wire is for use on the WR, not the YZ, but if you want to cut it... :thumbsup:...SC

Exactly what he said. Man it's funny how information gets out there. :thumbsup:

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Where do you get your information??!!!??? :thumbsup:

South Valley Motorsports. The guy that looks like Buzz Lightyear. Thought it might have been a trustworthy source, apparently not.

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Yamaha Cardinal Rule #1...NEVER take what a guy from a dealership says as gospel. It is almost always wrong, and, at the very least, suspect. Now you know, Grasshopper :thumbsup: ...SC

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Yamaha Cardinal Rule #1...NEVER take what a guy from a dealership says as gospel. It is almost always wrong, and, at the very least, suspect. Now you know, Grasshopper :thumbsup: ...SC

when i bought my bike the salesman said the bike will rev to about 14000rpm, i just nodded and smiled. :thumbsup:

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when i bought my bike the salesman said the bike will rev to about 14000rpm, i just nodded and smiled. :thumbsup:

Just reinforces the BS level of understanding from A LOT of sales people 9not all)

I think as individuals they are fine people, but IMHO, the average Joe on TT knows more than your "run of the mill" dealer person. The number of times I have talked to dealers / sales people and wondered how they got the job? - I know! they just want to sell bikes...

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Is this the grey wire you're talking about:

GreyWire.jpg

Is it ok to make make this mod if the exhaust is still 'original' on my WR450 '05 or is it absolutely required to modify this too?

Thanks!

Arnaud.

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Mine didn't know my 05 WR had a air pump, and thought it had a aluminum frame with "a new 5 speed transmission"!!!!. NO F%$*@ng SH*&^!!!! That should not surprise most of you, but hopefully someone will learn. Always take a experienced and knowledgeable person with you to put a stop to a salesman and their line of crap.

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The Grey wire is the wire that Yamaha put on the WR's to retard the ignition timing. If you have a WR, you can cut the Grey wire, thus giving you a more rapid response to your throttle, more rpm's, more hoarse power, you get the idea.

Basically, if you cut the Grey wire you will have mapped your cdi the same as the YZ. The ignition will advance, and you will see the difference. There is nothing wrong with the WR ignition timing though. So check it out, and decide for yourself :thumbsup:

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Yep, that point is clear! :thumbsup:

But is the grey wire one I indicated in the picture?

GreyWire.jpg

Thanks,

Arnaud.

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I always get a kick out of how some 20 ish kid working at a dealer thinks he knows more about bikes than a guy whos been riding them longer than "THE KID" has been alive. They just want to sell bikes with whatever crap they can get you to believe. A salesman at my local dealership was overheard telling a customer that a WR250 is the wrong choice for the trail and that a 125 2 smoke is the ultimate bush bike. Nuff said---WR Dave.

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Hey guys;

We just finished all the mods on my pops 06 WR. The gray wire was our last monkey wrenching and we sort of hemmed and hawed about it. I didn't want to CUT it, being his brand new scoot in the last 20 years.

You don't need to cut it, there are a few threads on here about pulling the insert out. It's easy to do...

As you look at the open female side of the 6 pin connector with the gray wire in the harness, you'll notice the metal plugs are square, AND tiny. Right above each plug is a small plastic tab. By pushing that tab up and away from the metal pin and simultaneously pushing the plug out, you remove the gray wire from the 6 pin harness without any cutting or damage. Its easy to do. I used a small screwdrive (like to fix glasses with ) to push the plastic tab up, and another screwdrive to push the pin out. Then you just take it up to keep it isolated from shorting. And plug you open hole with silicone or a wad of tape also.

This way of gray wire modding is useful so you can return it to stock should you decide it makes the bike TOO powerful, which some have said after taking a ride on this rocket ship of a dirt bike;that its now too fast. :thumbsup::thumbsup:

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Yamaha Cardinal Rule #1...NEVER take what a guy from a dealership says as gospel. It is almost always wrong, and, at the very least, suspect. Now you know, Grasshopper :confused: ...SC

Not all dealers service personell are morons......but most sales men are :thumbsup:

Come see me sometime and we can talk tech :thumbsup:

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Okay I am either blind or stupid or maybe both but I cannot seem to see a gray wire in my '98's wiring harness. I guess I will back and look again. Any info. would be greatly appreciated.

_________________________________

Go hard or go home, See ya on the trail!

'98 WR400

'87 KDX 200

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