Hold on

[Michael DaymanMember]

Hey did the jets on the carby. And then seen a video on you tube for the grey wire mod on the 08 WR 250 it was a US video so I checked first and the Aussie model is the same. so I gave it a go and F@#CK ME it makes a massive difference all over the place.you take the left side cover off and you will find the cdi off that there is 3 sets of wires one is a set of six on one side of that plug is a red with a black stripe a grey wire and a blue with a white stripe. The grey is the one you unplug. take a small screwdriver and remove the rubber dust cap from the rear of the plug and then lift the tang in the front of the plug to withdraw the spade from the plug then cover the wire with heat shrink or lekky tape to protect it from dust and water so you can put it back if you dont like it or when you want to sell it plug the connecter back together put the side cover back on and :ohmy: WOOOOOOHOOOOOO:)

[ChrisMember]

Hey Mick,

You got a link to that video, I have seen one on the older WR’s but not the 08. Congrats you now pretty much have a YZ250, from what I have researched removing the grey wire changes the CDI mapping to the YZ mapping. Did it give you more power or just quicker acceleration. Can you explain the difference.

Cheers
Chris.

[Michael DaymanMember]

http://www.youtube.com/watch?v=bMRbeH32MHo – 65k
Definatly more acceleration as for power its hard to tell because I have just changed the jetting as well. I wish I had done the wire before I did the jetting then I would have a better idea of what i does but the diffence with both combined is awsome

[GregMember]

chris72a wrote:

Quote:

Hey Mick,

You got a link to that video, I have seen one on the older WR’s but not the 08. Congrats you now pretty much have a YZ250, from what I have researched removing the grey wire changes the CDI mapping to the YZ mapping. Did it give you more power or just quicker acceleration. Can you explain the difference.

Cheers
Chris.

I thought that the YZ had different ignition mapping, different weight flywheel, different cam profiles and gearbox ratios dont they?

[DeanMember]

maybe you could also put a switch inline with the grey wire and have duel mapping just a thought

ollie

[ChrisMember]

Ollie wrote:

Quote:

maybe you could also put a switch inline with the grey wire and have duel mapping just a thought

ollie

Yeah Ollie I have seen them put a switch in the airbox to switch between the mappings, could be a good thing

Cheers
Chris.

[GregMember]

Ollie wrote:

Quote:

maybe you could also put a switch inline with the grey wire and have duel mapping just a thought

ollie

Hey thats a good idea Ollie, when its wet that would be the bomb
Karma for that idea old man

TB

[ChrisMember]

Quoted from elsewhere

The WR250F comes with the gray wire from the CDI connected to ground. All the other 250Fs have this wire disconnected. There are two different maps (spreadsheets) in the WR/YZ bikes. One is for the YZ and is selected if the gray wire isn’t grounded. The other is for the WR and is selected if the gray wire is grounded. With the gray wire connected an alternate ignition-timing map is used. The WRF map retards the timing at the mid and upper RPM so that the bike will run with the stock baffle and throttle limiter installed (see link with actual engine data analysis by TT member McGrath). If you remove the baffle and alter the throttle stop you should also remove the grey wire. Most people do not like the alternate mapping and disconnect it, especially after doing the other free mods. Initially it was advocated to cut the wire, and many riders have. There are disadvantages to cutting the wire. First if you may initially cut the wrong wire. Second, if you decide at a later time to return to the original ignition-timing map it is more difficult. Most now advocate simply disconnecting the wire from the connector and taping it off with electrical tape. For more information about this topic see CDI 101 or the Grey Wire thread in the ThumperTalk archives.

[ChrisMember]

I’m going to hit Jaycar tommorrow and see what they have try and find something slightly dust and water resistant, don’t like the idea of drilling holes in my new baby though have to find somewhere else to stick it.

Chris.

[GregMember]

Buy a kill switch, on/off from a bike shop. mount it around the bars use it when riding like a vortex or Ollies two smoker one, kill switch designed for conditions

[Michael DaymanMember]

A handle bar mounted switch would be a top idea but can the mapping be switched on the move or while the engine is running? there could be the chance of a electrical surge into the cdi!

[DeanMember]

Trailboss wrote:

Quote:

Buy a kill switch, on/off from a bike shop. mount it around the bars use it when riding like a vortex or Ollies two smoker one, kill switch designed for conditions

yep exactly what I was thinking;)

ollie

[GregMember]

Yeah Chris and I discussed it this morning on the phone, and the thought is you MAY have to switch it of to swap maps, that in mind it would be good on the trail for sections of track and be great on the bars, but it could be bumped. That said where is the surge coming from, how is it there is a surge, why would there be a surge? I am not saying its safe but explain to me where the surge comes from, isn’t a pulse system requiring a position related signal sent to the spark plug in layman terms?
How is that you can switch a vortex on the move, I do it all the time, that’s why we have bar switches, even the gasser has one that changes ignition mapping on the move, why dont they surge?

Surge???

TB

[Michael DaymanMember]

I was just talking to ballards and he has done the grey wire mod on his WR 250 and uses a on/off headlight switch ($20 through them) mounted on the bars and he has flicked the switch while riding plenty of times with no ill effect. But he did say he could not really notice the difference but that could be his bike.

[GregMember]

Mickust wrote:

Quote:

I was just talking to ballards and he has done the grey wire mod on his WR 250 and uses a on/off headlight switch ($20 through them) mounted on the bars and he has flicked the switch while riding plenty of times with no ill effect. But he did say he could not really notice the difference but that could be his bike.

Yeah that makes sense couldnt see how there could have been a surge, good can now rest my rum reduced thinking module

TB

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