WR-250 Grey Wire "Aloha" Report.......

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Feb 24, 2001
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#1
Just got back from riding, post "wire surgery" having the bikes "snipped".
First word......
WOW!:p

Second word......
GOODNESS!:eek:

Okay......'nough of that.
Bikes are: Minor local mods of the jetting, YZ timing, all restrictions removed.....

Flat spot, well it is gone. . . . . . and not only that, the pull and power characteristics are changed quite a bit as well (this grey wire and the ol ignition curve remapping must be pretty close cause the change is really significant).

Bike pulls hard (yes hard) from just above idle, all the way until the local dogs start howling....(hard)
I noticed a big difference right out of the parking area even down low and going slow, almost pipey........(is that really a word?)
No loss in the smoothness at all, no loss of the torgue (rode trails too) in fact its easier to ride now, roots, ruts, rocks etc are easier to loft the front end over; you dont have to worry if you are up far enough into the R's to get the front end up, cause now it dont matter, cause the front end will come up; any gear and throttle position as long as you are just off idle...
The surge at around 5-6k is history....just smooth, hard pull.

On the track the front end lofts with little to no effort, wonderful on the whoops.....(almost got myself in a bit of trouble until I got used to it on a real whooped out section of track....wasnt ready for the ease of lofting the front through the rough stuff, had very colorful visions of new rear fender, tail light..paramedics consuming large quantities of gauze and the like...... :eek:
Before you had to work it, until you were up hard on the 'cam' to do that.
Riding behind my sons, the amount of roost that he was throwing at me was night and day different from last weekend (the little stinker, I will go get my 500 and show him)....big change on how quick the bike gets moving now from before, no hesitation (flat spot), the thing is almost like a two smoke in the way that it pulls and how quick it pulls.......

i thought there was a change with the YZ timing, but now......
I be smiling! :)
14 year old son likes the mod as well........
I went ahead and did the snipping on both WRs and they are tapped off and wont be reset.....

Okay, have to unload now, and get showered all that stuff.......
Great mod and great "detective work" on the flat spot.....
This forum rocks!.....

now
does anyone want about 40 dollars in jets.......?....dont need 'em any more

be good........
HR
:cool:
 
Joined
Feb 12, 2001
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#2
hey h-r,
you seem a little wishy-washy on this grey wire mod -- tell us what you *really* think. :cool:

the wrooster

ps
can't get the smile off my face either. also, are you running with a vortip or completely uncorked? right now i'm wide open, but after a long day my bean is ringing a bit. i know you don't have this problem, what with you going faster than the speed of sound and all... :eek:
 
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#3
Uncorked ? I prefer Merlot......

As far as what do I really think?
I think I am going to have another beer......how about you?
:confused:

Exhaust:
Yes I am, well sort of....I made my own turn down from a 90 degree bend exhaust/auto pipe from Napa, cut it perp to the ground (when mounted), smoothed everything out, painted it black and used self tapping screws to hold it in.
Not as quiet as the actual "Vortip", but it throws all the sound into the dirt and makes a big big difference.......($5.00 total cost as well)

as far as ears ringing......hell I just turn down my hearing aid, easist solution at my age......I ride toooooooo slooooooooooow to worry about it!....

HR
:cool:
 
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#4
I must have missed something but it sounds good so far. Cut what and where? or where did you see the post? This sounds like free horsepower. Just for the info my Yamaha dealer said they know about the kickstarter but thats it from him. Gald I have a welder, larger tab on footpeg no problem now.
 
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#5
Grey Wire. . . We Dont Need No Stinkin Grey Wires........

Handl-it.....
WR-250 US models only:
Under the tank you will see a grouping of wires coming out of the main harness. There is a small black connector with two wires running through it. Black one and a grey wire. (cant miss it, only two wire connector there) Its right behind the coil, right side of the frame.

Cut or ??? this grey wire out of the ignition circuit. It remaps (from the experts best guess here) the ignition on only the US models causes flat spot, does weird things to bottom end (attempt to at one time hope for Green sticker legal in Ca???) who knows......
Dont cut the black its your primary to your kill switch.
Tape it off (or wire nuts or whatever you are into :D )
then this is important.
1. Riding gear.
2. Start
3 Hang on....
4. :)

Snipping is good! (well for the bikes, "mine" wasnt fun :eek: )
but both have the same result when done, both are TONS of fun when it is all over!!!!!!!
be good......
email if you have questions......

HR
:cool:
ps: This whole grey wire thread was on Thumpertalk, but it is up/down ?????
so the above is the nuts and bolts of it......
 

SpokerAce

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#6
I too did the grey wire mod. I had changed the timing but hadn't had a chance to ride it. During the wait I read about the wire.

I took it out last weekend and it is definitely much quicker. Now if only I had the skill to hang on and really ride it like it should be ridden.

I used a very tiny screwdriver (I think they call them jewelers screwdrivers?) to push the wire out of the connector. When you unplug it, push the wire out of the half of the connector that is towards the back of the bike. Not the one coming from the CDI side.

Now to order a Vortip.....
 
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#7
Sounds real simple to me, the only bad thing is I have to wait to do it. The wife has made plans you guys can guess the rest. Have to make her happy! I have a vortip in my bike and I like it, noise level and performance all in one. One would think Yamaha would have made a performance tip for ISDE competition. Most of us here think it was never really made to run the stock insert.DUH! So why not make a good one that works with a decent noise level? Ran into some horses on the trail today made me gald that I could idle by. Anyway thanks for the tip, hope my arms can hold on.
 
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#8
Handl-it.........You will enjoy it........

Let me know when you do the mod......would like to know what you think, especially with the Vortip....I dont have one yet.....but I am moving back to the Mainland in a month (Fort Lewis Washington) and will have to get one......
Where you live.......in Montana?
Folks live in Spokane, and will be that way a bunch once I move off the Island......
Good luck, and yes one must keep "Chief of House" happy......:D

HR
:cool:
 
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#9
...so now the question is: Is there value to going back to the WR timing with the grey wire disconnected.

With the grey wire disconnected there is plenty mid and top - I am now regularly bouncing off the rev limiter. But... I would gladly sacrifice some of it for more grunt down low.

Anyone tried it?

- Sean
 
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#10
When I first got my bike (in March) it ran like crap. Everyone said to buy a Vortip and it will run great. I bought one and it ran a LOT better but still like crap - just a more refined form of crap. Then everyone said to change to YZ timing and I'll love it. I made the change and it did run significantly better but was still in the crap range. I was VERY disgusted with the bike. Then everyone said to pull the grey and I would love it. I thought, "Yeah right! I've heard that before!" I figured the grey wire was just another dream and did not pull it.

I went out last week but just couldn't ride it. I couldn't concentrate on riding, only on how crappy my new $6k bike ran. After 5 miles, I returned to my car, pulled the seat/tank off and disconnected the grey wire. It was either that or get a for-sale sign!

The grey wire was the red pill! The bike is pretty much PERFECT now! How the hell could Yamaha have sold the bike with the grey wire? Before I pulled it, I was all set to sell the bike and vow to never buy another Yamaha, now I think the bike is fantastic.
 
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#11
I wanted to buy a 01 wr 250F but they sold out before I could get the scratch together so I got a used 99 WR 400. I know a guy down the road with a wr 250F, maybe if I dont tell him about the wire he will get all mad at the bike and I can Weez it off him cheap or trade for my 400 :p ??????? Sound like a plan or what?
 
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#12
What's the difference on which side of the connector that you disconnect?
I disconnected the CDI side and taped it off, Should I remove the wire completely?
Thanks for the replies.
 
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#13
SpokerAce - I disconnected my grey wire like you did, but I pushed out the gray wire on the CDI side of the black connector and tape everything up real good. Are you recommending that the other end be removed? I rode my WR250F for 40 miles yesterday without a single problem and had a BLAST . :)

I just want to make sure I did it right...
 
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#14
I think the idea is to remove the no powered side of the wire so if for some reason it shorts to ground it wont hurt anything and the powered side is safe and cozy in the dead connector, cheap insurance for the CDI, grounding the wire will cause the over riding power killing map to engage but should not hurt anything but your ego, best to be safe I think is idea I think.
 

SpokerAce

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#15
I went with the backside wire based on comments/suggestions from the original post on thumpertalk. Although I'm no mechanic or electrician, I'd have to agree with the "powered" theory if it's really powered.

I'm not sure if that's the "right" way or not, I followed the lead of others once their testing was done....

I had read that the Euro models had the wire from the CDI to the connector and then no wire going out the backside.