Yamaha WR250R Mega Thread

[RichardU]

Originally Posted by Dr Zed

Hey guys. I wanted to order Flatland Racing radiator guards for my wifes WR and is it true they only make them for one side? I thought that was kinda funny

It is funny. Unlike your namesake DR.Zed there is only one radiator on the WR.

[Doctor Zed]

Only one radiator!!
Blasphemy!
Thanks.

[HardWorkingDog]

I believe the US & German models have the radiator on the right side, while Japan, Oz and the other backwards types are on the left.

Could be wrong, though; what do I know?

[DougZ73]

And it overheats less than my old DRZ( 2000 kicker) used to. Could also be I am faster on it than I ever was on the DRZ.

[emerson.biguns]

Anyone looking for a WR290R close to Tucson? I think I'm going to put mine on the block here shortly. I've just done a major bike collection realignment and I'm ready for something different.


.

[DeArmey]

I am looking to add this bike to my stable but seems no one has any to sell and 2012 doesnt look any better. What gives?

[HardWorkingDog]

Originally Posted by DeArmey

I am looking to add this bike to my stable but seems no one has any to sell and 2012 doesnt look any better. What gives?

I'm really surprised their website is so horribly botched up right now. Maybe give them a call at headquarters: Customer Relations (800) 962-7926 in Cypress, CA.

I've found them pretty helpful in the past.

[bpg]

Originally Posted by thumpjump

This is how I spent last weekend!



Dawn to Dusk 12 hour (Actually 13 hour) Enduro in Wales, U.K. WRR performed flawlessly. The other bike is my teammates KTM 400EXC. Go Team Allied Farce!!

Pre-Race Photo



After Lap 1 of 6

Way too cool! Really liking the emphasis of ENDURANCE in that enduro, wonder if there is anything like it stateside?

[Yaozer]

Hi Folks:

I drained my stock battery last week and killed it. I purchased this battery a while ago for my SV made by a member of another forum. Can I safely run it on my 2008 WRX without causing any problems? Here are the specs:

Modified Dewalt A123 (MDA123) Battery Pack
Weight: 1.5lbs
Dimensions: 4.5”x3”x3.25”
Specs:
4.6Ah
240A Max Pulse Discharge (10 secs)
120A Max Continuous Discharge
Nominal Voltage: 13.2V
Maximum Voltage: 16.8V*
Minimum Voltage: 8V*
*Exceeding the maximum/minimum voltage during Charge/Discharge risks damaging the battery.
Operational Temperature Range: -22 °F to +140°F
Nominal Operational Temperature: 77°F
Storage Temperature Range: -58 °F to +140°F
Nominal Storage Temperature: 70°

[ICERIDER]

Here we go! Long time since I posted so cut me some slack if this doesnt look correct. It's been 2 years since I came across this monster thread and learned about the little WR. Been soaking up all your hard-earned experiances for long enough so it's time I chimed in.
Installed my IMS 4.7 yesterday and found that the wings would not empty. I put 1.5 ltrs of gas into the tank initially and swamped the well at the base of the HP pump. Turned the key and the HP pump primed as normal. Started the engine and watched for the vacuum pump to lift fuel from the wings.....no go. Engine stops due to HP pump-well emptying.
Removed tank and HP pump. I found that I could blow back through the vacuum pump outlet pipe, through the vacuum pump etc, and the air bubbled into the wings. I could also suck gas up from the wings (cant remember gas being this flavour from when I was quite skilled at syphoning. What have they done to it?).
Double checked that my vacuum supply was correct as per IMS instructions, so it had to be the vacuum pump itself. Thinking about it, I should not have been able to blow back throught the vacuum pump due to the internal flapper valves, so perhaps there lay the problem.
Details of the fix tomorrow when I figure how to post photos again. Easy fix, should work for all of you who cant empty the wings.

[thumpjump]

Originally Posted by bpg

Way too cool! Really liking the emphasis of ENDURANCE in that enduro, wonder if there is anything like it stateside?

I'm wondering the same thing. I really liked the race format. I guess Baja 1000 / 500 (although not exactly State side) would be kinda the same, but more extreme. There's the Barstow to Vegas race too. I'm moving back to the US of A next month, so I need to find something to curb my addiction.

[ICERIDER]

Mikuni vacuum pump. The brass pipe pointing at you is the little one that protrudes from the rear of the tank and takes the vacuum feed from the motor. Sealed by a single o-ring which sits in the brass well. Gas inlet at the top. Outlet at the bottom.



Cant be much to it. What's inside....



The lid with cavities and the vacuum feed. One paper gasket. Beneath that a combined clear plastic diaphram and rubber gasket. Main body a system of ports. Moving parts are the vacuum actuated clear diaphram and the two little flapper valves.












When vacuum pulse sucks, diaphram lifts ans pulls gas through this flapper valve. Also pulls outlet flapper valve shut so it doesnt pull fuel back up the pipe.



When vacuum pulse pushes, diaphram is depressed. This outlet flapper valve now opens allowing gas to be pushed out and down to the HP pump whilst the inlet is pushed closed. The problem with my pump was the inlet flapper was staying open for some reason. allowing me to blow back up the line, and spoiling the pumping action.

.

Time to put it all back again (for the first time ) Note I attached the vacuum pump outlet tube this side so I could observe it through the tank filler.

But before putting it back into the tank, I had an idea...there didnt seem to much of a well around the base of the HP pump to hold fuel so I had a little think about that.



A strip cut from a still water bottle held nicely in place with the o-ring. Now why shouldnt that work? Well it's only half of the solution that's why. It will only hold fuel if there's more going into it than going out.



Here you can see with the motor running that fuel is being lifted from the wings. Quite a small flow. Doesnt seem to alter much with revs. Problem is that the HP pump dumps excess fuel out the top against a baffle. It seems to pressurise the system with much more than the motor needs and splashes it all over the place out the top. Good thing is this cools the pump from the inside, so you see it doesnt actually need to be submerged. Bad thing is that it is starving fuel from the base of the pump faster than the vacuum pump can replace it. THERE'S YOUR PROBLEM. The only way it will work reliably is to catch the dumped fuel from the top of the HP pump and put it back into the well. How do you do that? With a plastic water bottle of course

[rydnseek]

One of my riding buddies from Florida wrote me about his new seat.. a Sargent. Evidently they now carry them for the WR. I don't remember if anyone has posted a link or used them before, but he wanted me to mention it on the forum. Here it is!

I haven't ridden on it, yet, but he seems pretty happy with it. Here is what he said in his email to me:

"Sargents used my WR to make up a more comfortable seat, just picked it up this morning.
Much wider, lite, and fits perfect."


http://www.sargentcycle.com/yamwswr.htm

[rydnseek]

Originally Posted by ICERIDER

Here we go! Long time since I posted so cut me some slack if this doesnt look correct. It's been 2 years since I came across this monster thread and learned about the little WR. Been soaking up all your hard-earned experiances for long enough so it's time I chimed in.
Installed my IMS 4.7 yesterday and found that the wings would not empty. I put 1.5 ltrs of gas into the tank initially and swamped the well at the base of the HP pump. Turned the key and the HP pump primed as normal. Started the engine and watched for the vacuum pump to lift fuel from the wings.....no go. Engine stops due to HP pump-well emptying.
Removed tank and HP pump. I found that I could blow back through the vacuum pump outlet pipe, through the vacuum pump etc, and the air bubbled into the wings. I could also suck gas up from the wings (cant remember gas being this flavour from when I was quite skilled at syphoning. What have they done to it?).
Double checked that my vacuum supply was correct as per IMS instructions, so it had to be the vacuum pump itself. Thinking about it, I should not have been able to blow back throught the vacuum pump due to the internal flapper valves, so perhaps there lay the problem.
Details of the fix tomorrow when I figure how to post photos again. Easy fix, should work for all of you who cant empty the wings.

Good pics & writeup! I've also not got around to troubleshooting my 4.7 vacuum lift.. when i run out of gas, it doesn't draw from the wings, either. Your water bottle bottom looks like a fairly good solution, as long as the pump is working. When my tank is running empty, i slosh my bike from side to side to reprime the pump. I can get a few more miles that way.

It's only about 1/2 gal that is stuck in the wings.. not a big deal, but we want the whole 4.7 gals!

I'm a little puzzled.. is the mikuni pump in your pictures a separate pump you got? You mount it inside the tank & it helps draw the fuel to the fuel pump?

Thanks again for the great, clear pics & writeup.

[trav72]

Originally Posted by rydnseek

I haven't ridden on it, yet, but he seems pretty happy with it. Here is what he said in his email to me:

"Sargents used my WR to make up a more comfortable seat, just picked it up this morning.
Much wider, lite, and fits perfect."


http://www.sargentcycle.com/yamwswr.htm

Looks like a nice seat. But $370? That's a bit much! I didn't even pay that for the one I bought for my VFR. I think I'll stick with my seatconcepts seat at about a 1/3 of the cost.