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WR250F 2015 stock power compared with yz250fx

By powerhard,
in WR250F/YZ250F/YZ250FX

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powerhard

Posted
Posted

Hello, I've been for a few rides now and while i am still waiting for my tuner and exhaust, i was wondering how much difference the tuner will make. I hope it gets rid of that lack of power down low. The FX would have say 40hp how much would the restricted Wr have.

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Grand Master

NW_drZ

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Posted

Hello, I've been for a few rides now and while i am still waiting for my tuner and exhaust, i was wondering how much difference the tuner will make. I hope it gets rid of that lack of power down low. The FX would have say 40hp how much would the restricted Wr have.

If it's anything like my 2011, once unrestricted you will notice a huge difference. My WR hits very hard now with the full pipe, grey wire mod, accelerator pump mod, yz throttle stop, etc.. When I first got the bike I was a little underwhelmed with the power, especially coming from a nicely modded drz. I have seen dyno charts putting my generation WR right around 32hp stock. From what I have read, the mods you are about to do should get you right in the FX ballpark.

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soulrider

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The mods make a huge difference.  I have a 13 WR250f currently and the bike was weak and boring stock, once the mods were done it turned into a great trail bike with a lot more power.  The '15 has quite a bit more potential, once the changes are done it should have YZ engine performance.

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BazookaJoe

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Guys-

I think you are overlooking that the OP is from Australia. Their WRs are not corked like the USA WR250F, and the US model is discussed in all of the US magazine articles. "Restricted" in Australia means they have a WR muffler w/ large outlet.

To answer the OP's question, I just got my GYTR tuner and was playing with it this weekend. With SO many tuning options available, I am confident that the GYTR tuner will perk up the power.

Btw, the '13 and older WRs have a completely different detuning scheme and are not really relevant to this thread.

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  • 1 month later...
Contributor

mikesch

Posted
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It is a gigantic difference from stock to the few easy mods. Dirt Bike Mag (I think) touched on how many prefer the 2015 WR250F with the changes to the YZ250FX.

What are the changes the magazine recommends.

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riles

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I rode a stock 15 YZ250f today, single track and open 4WD tracks. My mate rode my stock FX and we swapped around a bit. It felt like the YZ has a few more horsepower. You could feel the YZ spins up noticeably quicker. A great top end. His comments "the forks are better on the FX (for bush/Enduro) and the gears are perfect.

He agreed with the FX having a bit less go but said it was strong (for a 250f) and linear.

I'd be interested to know what fuel map/ignition the YZ comes with compared to the FX or is it the same?

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yamahadude93

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What are the changes the magazine recommends.

This is the info you are looking for. The stock ecu comes with the EPA regulations in it. The comp ecu zeros out everything allowing the bike to operate like its suppose to.

••

Yamaha GYTR Competition Kit For WR250F

Company: Yamaha

Price: 107.05

ROOST

Low price and easily the single best mod for a WR250F.

Makes your WR a race bike, yet still reliable.

Plug and play or play with it more through the GYTR Power Tuner.

ENDO

Careful with the wiring connections.

You need the Power Tuner to really take advantage of this ECU.

Credits

Writer: Jimmy Lewis

Photographer: Jimmy Lewis

What it is

The easy way to make the Yamaha WR250F a competition bike.

A competition ECU and throttle stop screw that replaces the standard ECU and metered throttle stop screw on the Yamaha WR250F to allow it to allow full competition setting. This is a plug and play and replaces the mapping that is EPA emissions and sound compliant with one that is tuned to run as a closed course competition race setting. It also allows the use of the GYTR Power Tuner (sold separately $279.95) to make tuning adjustments to fuel and ignition timing.

"A competition ECU and throttle stop screw."

How it works

Just a little black box and a screw is all it takes.

Gets rid of the 1/3-throttle stumble of the stock ECU.

Allows nearly limitless tuning with the GYTR Power Tuner.

The low cost of the kit shows Yamaha is serious about letting you get the most out of your WR. A standard replacement ECU runs in the $500-plus range, so the kit is really a deal. It comes with very basic instructions and the toughest part is figuring out where they hid the ECU in the first place. (It is between the gas tank and the air box and is difficult to see till you remove the tank.) The other part included is a different throttle stop screw for the throttle body to allow the bike to be operated at full throttle. Standard the bike only allows about 1/3-opening.

The instillation takes about a solid hour and you have to be careful with the locking clips on the electrical connectors. They can be tricky to disconnect and we even snapped one of the retaining clips on reassembly. We weren't worried as the fit of the connector was beyond snug and we fastened it so it could not come loose. Adding a little bit of dielectric grease when installing the ECU is also a good idea.

If you are going straight from the restricted throttle, you will be blown away with the huge increase in power and how far the bike will now pull and rev. If you are going from a fully opening throttle with just the ECU swap, the power and pull will not be as impressive, but you will notice the bike no longer has the low-end stumble at about 1/3-throttle. If you plan on changing the muffler, this ECU is a must.

We rode the bike with the stock muffler (smallest restrictor removed) and with the standard mapping (all zeros) for a little bit and it was OK, maybe a little rich in spots and seeming like it was set up to be run with a more open muffler. We wanted to keep the WR quiet so we started playing with the mapping through the GYTR Power Tuner. We leaned out the fuel and this woke the bike up but mostly it stalled a lot less. What the WR really liked was bumping the ignition to give it a little to a lot more throttle response depending on the traction conditions. Our WR, with a stock muffler now runs nearly as hard as our YZ250FX with its spark arrestor and FMF Q4 Muffler.

Just getting rid of the WR’s stumble was easily worth the $107.05 price. But having the ability to use the Power Tuner to get the bike to run perfect was even more impressive and the key to getting the most out of your WR.

"Having the ability to use the Power Tuner to get the bike to run perfect was even more impressive and the key to getting the most out of your Yamaha WR."

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Apprentice

Baja Guy

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Posted

Getting my new WR250F next month.  Will be adding new ECU and opening up the intake and exhaust along with bigger tank.  Still considering and FMF exhaust.  I hope the TT moderators will pin a mapping thread (or add it to the current jetting thread) for the 2015 WRs where owners can post maps they've come up with.  I'll be setup for and ridden in Baja (fun, not racing).

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  • 2 weeks later...
Grand Master

mlatour

Posted
Posted (edited)

hi,

the new ECU you are talking about is the ECU from YZ250F? which you can buy via Yamaha dealer?

 

This thread might be of interest to you ciprian:

https://www.thumpertalk.com/topic/1126702-wr-250f-2015-with-yz-ecu/

 

It seems the Euro spec 2015 WR250F already comes with the FX's programmable ECU,

the US/Canada versions have the non-programmable 'WR' ECU to meet emission standards.

 

Replacing it with a YZ250F ECU disables the electric start on the FX and WR so not really of best interest,

it's a better option to re-program the FX's ECU with equivalent 250F settings.

Edited by mlatour
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Newbie

ciprian popescu

Posted
Posted

This thread might be of interest to you ciprian:

https://www.thumpertalk.com/topic/1126702-wr-250f-2015-with-yz-ecu/

 

It seems the Euro spec 2015 WR250F already comes with the FX's programmable ECU,

the US/Canada versions have the non-programmable 'WR' ECU to meet emission standards.

 

Replacing it with a YZ250F ECU disables the electric start on the FX and WR so not really of best interest,

it's a better option to re-program the FX's ECU with equivalent 250F settings.

you right. all clear now ? many thanks

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Rookie

hikerduane

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Posted

Well crap, if getting a comp ECU disables the electric start, I'm in trouble. I tried kick starting my '15 over a month ago for the heck of it, had gotten down into the 20's F here in the mountains over night, I had to use the electric starter. I see nothing has changed, same old Yamaha starting routine that all my Yama's have had. Maybe this summer it will work better.

Duane

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