Yamaha WR250R and WR250X Forum

I really want the q4, I will try and raise some cash over the weekend!

As you know Andy I do want the Q4 pipe but  having had 6 weeks off work after an operation (no pay, I'm self-employed ) I went back to work & overdid it.

The result is yet more weeks off work, yet more weeks with no money .

Just to really piss me off, no riding either

Good luck with the sale, unfortunatley it's just bad timing for me.

Steve H wrote:

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As you know Andy I do want the Q4 pipe but  having had 6 weeks off work after an operation (no pay, I'm self-employed ) I went back to work & overdid it.

The result is yet more weeks off work, yet more weeks with no money .

Just to really piss me off, no riding either

Good luck with the sale, unfortunatley it's just bad timing for me.

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 No probs Steve.....hope you get yourself sorted and get back out on the bike.

Cheers,Andy.

Hi.  I am the owner of your e bayed FMF q4 silencer.  My mate had to bid for me as I was doing family things when the auction ended, and sneaking out at 7.30 to bid on my phone just wasn't going to make for a harmonious evening!

Arrived with me today.  Mint condition as you said.

I'm still confused about fitting it.  I've read the instructions which say to simply remove the exup and wires back to the relay under the battery.  Is that it?  No error codes will come up?

Also, what is an ais?

O2 sensor.  Should I weld in the socket and fit the sensor into the FMF silencer?  If not, what should I do?  I saw the post that said something vague about chopping the wires and everything is now fine, but don't really understand.

An idiots guide to the whys and wherefores would be much appreciated.

Many Thanks - Steve

 

Hi Steve.....beware.....long post coming up

ref the ex-up.

Remove the seat and both side panels.Disconnect the two cables that go to the ex-up flap.Follow the cables across to the other side of the bike and under the battery you will see a big black box.

Take the cover off (held by four screws) and remove the cables.Refit the cover.

You must leave the main unit mounted and wired up,just remove the operating cables.

No engine light will come on.

There is no place to fit the O2 Sensor as the American WR's dont have one fitted.

Just unplug it and tuck the wire out of the way.

The A.I.S system is added to inject fresh air into the exhaust gasses.This is to aid a clean burn and to help the catalytic converter last longer.

As there is no cat fitted to the FMF exhaust,this can be removed.

Remove the n/s tank panel and the black cover over the expansion bottle.

The main unit is by the horn.

Remove the plug and tuck it out the way.

Follow the chrome pipe down to the front of the engine and un do the two 8mm bolts.Fit the alloy blank using the tin original tin gasket and bolts.

Remove the rubber pipe that runs from the A.I.S unit along the bottom of the tank and across to the R/H side of the air filter housing.

Fit the rubber bung to the housing using one of the spring clips from the pipe.

Pull off the main unit from it's mounting.

Hope this helps.

Cheers,

Andy.

 

 

Hi Andy,

Many thanks for that.  Now I understand what it's all about.  Will have a go at the weekend.  I'm sure I won't have any problems with your detailed description.

I will take some photos and post them up here as requested Brian.

Steve

I agree Brian.  There's all sorts in there.  If I ever broke down on the trail I wouldn't know where to start.  Even the idea of having to remove the tank to get at the plug is a new one to me.

SteveT wrote:

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I've not yet fitted the new FMF silencer.  I'm not happy about the issues around the O2 sensor, and the error code it's removal will throw up on the diagnostics.  I'm not really sure yet how you alter the wiring to get around that.

My local off road bike shop (and ex Yamaha mechanic) has advised me to weld the supplied socket into place on the FMF silencer and retain the O2 sensor.  This will then not have the error code issues, and in his opinion, the bike will run better too.

Any views on this anyone?

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I think if I had bought it I would try and keep the O2 sensor, if you can find someone who can weld the stainless exhaust then I would go down that route. At least then you know everything is working as it should.

Yes, it's just a threaded socket.  You need to drill a hole in the silencer pipe and weld it in, then screw the 02 sensor into it.  There's plenty of space on the FMF silencer as there isn't the EXUP valve clogging up that area.

The socket that came with the silencer was the wrong thread (metric fine), even though it was a Yamaha part.  The one I am using is really a car part, but given to me by Andy at Poole M/Cs. It's made by "bosal"  and called a Lamda Sensor fitting kit.  £8 on e bay here  http://www.ebay.co.uk/itm/BOSAL-LAMBDA-SENSOR-FITTING-KIT-/130620559258e 

Incidentally, the new WR450Fs are fuel injected.  They come out of the factory with an O2 sensor in the pipe, but with an extra motorcross pipe and silencer.  If fitting the latter, you can buy a "bypass loop" to remove the 02 sensor.  This "bypass loop" might also fit the WR250R?, thus avoiding the need to cut and weld.

Have you formed a view yet about the FMF pipe.  Too loud? or ok?

 

UPDATE  The link doesn't work, but if you google Bosal Lambda Sensor Fitting Kit  you should see the e bay item.

-- Edited by SteveT on Sunday 9th of December 2012 05:34:25 PM

I think this link works Steve.

I only had a seat on loan from Olly and the WRR now needs an MOT so, with no seat and no MOT, I haven't been able to get out on the WRR again. My thoughts on the FMF will have to wait a tad longer sadly. From what I recollect the noise was reasonably controllable by using smaller throttle openings 

When I get it on the road again I will try and fathom out this O2 business 

I had a chat with the previous owner of my WRR on the phone earlier. It was stolen from him and found left in the car park opposite his house after the thieves realised it had no battery and they had no hope of starting it. He still has some of the original parts including its seat! Sadly he threw the side panels away a couple of weeks ago 

Brian

Just got the WRR its first MOT (one advisory for worn chain) and I had a little moan about how loud the FMF was. The MOT guy pointed out that a "db killer" was installed. I can't find the device on line - it is a mesh cone that screws into the end of the can and may not be a db killer but another make/model. However, if yours hasn't got anything like this installed Steve then it must be real loud 

Brian

I am guessing this is just a spark arrestor?

I am thinking that it might be quite simple to put washer over the internal end to help quieten things down a bit.

The WRR has done very little mileage, and probably not all of it with the FMF on, so I am going to assume that if there is packing then it will be in good working order!

Is it the same fitting on yours Steve?

Yes, I have the same insert as that.  It does quieten the bike (a bit).  My FMF is "as new" and has only done a few hundred miles too.  Ordinarily, the packing should still be good, but I'm wondering if a previous owner has removed it (or some of it).

I had thought about the internal washer as well.  I need to experiment a bit I suppose.

Hi Brian,

You've got your priorities wrong.  Garage comes first!  (don't tell my wife I said that!)

I'm glad you've posted on this topic.  It's reminded me to update what I've been up to.  I've tried washers in each end of the spark arrestor insert.  They are quite quick to make fit and give a quick temporary test.  My conclusion is that "the smaller the hole, the quieter the noise".  (not rocket science I know).  With a washer with a 12mm hole for example, the bike becomes almost whisper quiet.  I didn't test ride it, but guess that at that size it would excessively restrict gas flow.  The original Yamaha silencer has a 21mm outlet pipe, so I started using washers around that size with some improvement in volume reduction.  I quick visit to B&Q found me a clothes rail bracket with a 19mm hole in the centre (picture 1).  I ground the outer flange down until it was a tight (tapped in tight) fit into the spark arrestor (photo 2).  It has to be fitted into the spark arrestor AFTER it's fitted into the silencer, otherwise I can't get access to the retaining Allen screw.

The resulting volume is better than without it fitted.  It has removed the very annoying deep bark, and generally toned the whole thing down.  Not whisper quiet, but much better than before.  I've yet to road (and trail) test it, but think it might be acceptable.  I'm hoping that it will stay tapped in, as I haven't yet figured a way to "fix" it in place whilst still being able to get at the Allen screw.  At 19mm and very short, I think it's no more restrictive than the original at 21mm and much longer.

Will update you when I get out and try it.

Hope your mod works out OK Steve.

Our tumbler drier gave up the ghost and I got a lovely sheet of metal out of the door that is easy to cut, bend and drill so I made up a baffle and fitted it this morning. Not sure that the general noise level has gone down but it has almost eliminated the"bark" entirely 

Got to stay around for a delivery but if it stays dry then I will take the bike out for a run and see how sound levels and performance have been affected.

Sorry to hear that you are still suffering Steve 

I had to park the WRR to get on with some other stuff and hope to get back onto it next week.

Brian

Not many s/h WRR parts for sale at the moment  

It seems unlikely that I will be able to buy the heat shield separately so I have bitten the bullet and bought yet another standard silencer but this time with the heat shield and other gubbins attached for not much more than a new heat shield

How much work was involved in taking out the cat?

Brian

-- Edited by WR250Rfan on Sunday 17th of February 2013 05:53:18 PM

I bought a standard WRR exhaust off eBay a while back with the O2 sensor and flap thing fitted.

Very heavy compared to the FMF but it obviously has some serious baffling etc insde.

I put it on yesterday to try and it's whisper quiet compared to the FMF. However it blows badly at the joint with the header pipe despite the clamp being full tightened. I guess this is a lot to do with the extra back pressure. Solvable with a bit of gasket goo I expect.

Unfortunately I didn't get the plastic heat shield with it ( about £114 retail! ) so I am going to put the FMF and put up with it until I get a heat shield from somewhere - anyone got one for sale?

Brian

 

Thanks Steve - that's really helpful.

Is the gasket fairly thin? There didn't look to be a lot of room between the FMF Power Bomb header pipe and the muffler.

I am beginning to think I need the standard header pipe as well as the silencer 

How much work was involved in removing the cat?

Brian

After seeing Steve's message I did some delving and found at least one forum message that said don't bother as removing the cat made the exhaust very loud but Steve says he has had his done and its still very quiet 

I now have a spare one that I can cut up so might give it a go!

Brian

-- Edited by WR250Rfan on Monday 18th of February 2013 07:03:20 PM

This should hopefully help!

http://wr250rforum.forumotion.com/t4926-decat-oem-exhaust?highlight=Exhaust

http://www.youtube.com/watch?feature=player_detailpage&list=UUCpsM0DgTfcOIuZ2CgVEOEA&v=ggIpUGvyYVQ

vid seems a bit jerky  ,don't know why, sounds ok though . you can clearly hear jons ttr with its fmf pipe

ive opened up my air box (hifive style wrr dual sport .com) so you can hear more induction when i open the throttle.

stevo66 wrote:

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ive opened up my air box (hifive style wrr dual sport .com) so you can hear more induction when i open the throttle.

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 Airbox mod here

Meanwhile, I might repack my FMF.

Having read High Five's thread here - scroll to the bottom of the page - I can use his experience to buy the correct stuff - FMF 4-stroke Performance Packing  (Product # 011393).

As luck would have it, my trade supplier stocks it so I will give it a go and report back if it makes any difference 

Brian