2007 tdr 125

[Sdrobo]

Hi guys I need a little help I've just bought a tdr 125.

And wow am I disappointed from my memories lol.

Anyway its in immaculate condition it's just had the barrel and head replaced by the previous owners. Stamped 4fu00 I have the original and that has the same code on it. But he bought a ebay 25 quid piston lol so I'll be replacing that unless any of you guys think that it's OK.

But my main concern is that it won't go 55mph and above 6k rpm

I can remember my old one years ago doing around 80 85 mph and the rpm s going up to and a little more than 11k.

So that's where I'm at. I can here the power valve doing its cycle when turning on the ignition. And I've also bought a full ginneli exhaust system. As I read that they are heavily restricted in them.

Could someone tell me how to go about to unleash a little more oomph.

Or de ristrict lol . Thanks

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Is the powervalve operational or did the 2007 not come with the servo and cables?

I presume you know already, but just in case, it's the round housing on the side of the barrel. Should have 2 cables going to a servo motor under the tank.

If fitted and operational, it should cycle (3 noises of an electric motor) as you turn the key on. If connected and it's not turning, this is likely to be the culprit, it could be jammed shut. Restricted ones were normally pegged closed, with no cables attached. Take the round cover off and see if it can turn. If it has cables, check they are on the right way around, they are marked 1 and 2 at each end (servo and PV housing) On my TZR250, they actually cross over between the servo and the Powervalve, so many people fit them the wrong way around when they've buggered about changing the barrel/piston etc.

Check carb, especially main jet for blockages, whilst the carb is off, check the reed petals are intact and not cracked or had the corners nibbled off.

You could try decoking the pipe, remove it, carefully bung one end with a potato/rubber glove over it or whatever, stand upright and pour in caustic soda. Leave overnight then drain and bash about a bit to clear any loose soot.

Edit - tech me to not read to the end. So the PV is cycling, pop the cover off and see if the PV arm lines up. At rest it should almost line up with a hole in the case behind the u shaped peg.
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TZR250 2MA road, TZR250 1KT road, TZR250 2MA race, TDR250, YZF-750R Boost colours.
Jaguar S Type 3.0 V6 Sport R, VW Transporter T5 GP LWB Shuttle 140ps DSG.

[TbirdX]

Do they have the same restrictor in the speedo as the DT does? Google is your friend.
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VFR800X - CFMoto 450MT - TTR250

[craigT19]

Sounds restricted to me and yeah its the same restriction method as the DT, just a case of earthing one wire, google will tell you which one as tbh its been years since ive done one and ive forgotten how lol.
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Bikes owned :- 2001 nsr125, 1999 zx6r, 2006 yzf-r1, 2009 xmax 250, 2012 yzf-r1, 2015 MT-07
Current bike : - 2016 MT-10
BCF member pops. sadly missed 1945-2003

[M.C]

I didn't think they were in production that long? Most of the ones I've seen are early nineties, even if they're on a later plate (after being imported).

[Sdrobo]

Thanks guys for your replies.

I will check those things tomorrow. And the wire that needs connecting well earthing out. I've read one that says it's a wire behind the clocks. And one says it's a blue black wire on the cdi.

And I've also read that somewhere that they weren't produced until 2007. And then somewhere else says that the newer ones are heavily restricted?

So I'm at a loss starting to feel like I'm getting somewhere thanks to you guys keep them coming please. And thanks again for all your help

[Sdrobo]

OK guy's I'm going to rebuild it as it's supposed to have a flat top piston in..

And the numpty has put a domed one in so I think the squish been out isn't helping .

I'm ordering the new parts from pjme what's your opinion on that. Or do you think the domed piston will be OK ?

[P.]

Just get it rebuilt anyway. Resolve all issues in 1 go.

[tsmith]

my 93 was like that.

took it to a yamaha dealer and got it derestricted. I think they set the YPVS up properly so it opened up at 60ish. Otherwise it just ran out of puff.


other stuff done to it was:

to stop it redlining everywhere I changed the gearing (+1 gearbox sprocket, -3 rear wheel sprocket)
full arrow exhaust
boyesen fibre reeds
#330 main jet

did 85mph at 10krpm after those mods.

make sure your new exhaust isn't restricted in any way

https://www.biker.ie/forum/showthread.php?t=50916

[M.C]

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[Sdrobo]

No I haven't done any mods to air box yet. For now I'll be more than happy for it to rev to 9k lol at least there will be a power band.

It's doing my flipping head in.

[Sdrobo]

No I haven't done any air box mods yet. I'd just be happy for it to rev to 9k for now. At least it will have some kind of band. It has none never mind narrow

It's doing my flipping head in lol. Thanks to you guys I've got some real good ammunition now to try and tackle the issues.

Really appreciate your help and advice. And above all your time

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[Sdrobo]

Right guys here's where I'm at. I've had the exhaust of and the power valve. There is no washer in the exhaust and the power valve is in correct and opening.

But not fully I've had it touch 9k on the stand well just under lol. But with load on down hill up hill no matter how it will only go to 7k. It feels like a rev limeter? And even down a big hill the clocks won't go over 50 mph but I know I'm doing more the clocks not calibrated right. My only other thing is take the tank off tomorrow and see if the blue/black wire has been grounded but I'm concerned that it will mess with the ignition curve. And I'm going to check the main jet.

Oh I forgot to mention I've drained the tank and put fresh fuel in. Shell v power lol
But hasn't made much difference. So what would you guys do next. And I've looked at the piston through the exhaust port it looks to have the correct flat top piston in it. So now don't know whether to buy a new one or not

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[Sdrobo]

Yeah it lines up bang on the hole. So is that right ?it goes to the hole after its cycle and is sat there before. It's flush up the exhaust port and I tried to flip it 180 degrees and it made it a little worse.

So thar when I whipped the exhaust of and found it was already in correctly

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[Sdrobo]

Could you send me a picture of your carb please. And as to what jets i should have in mine as that's on today's list I'm going to see if I can get it to rev out before I go and by a wossner piston kit.

Does anyone know a good 2t mech in or near Sheffield?

I know I know I sound like I'm giving up I'm not I just want it to run as it should. And with my illness it takes its toll. And I'm struggling.

I'm going to try and ground the blue/black wire today. Me thinks lol if it doesn't make any difference I'll just re connect where it was. But if my mind is right it definitely feels like some forms of restriction. Or a carb issue but it has plenty of low down torqe .

The power valve turns clock wise as you look at it when the rpm gets to 7 to 8k but not much. And as it only gets to just below 9k on the stand. But only 7k under load I doubt it opens more than a couple of mm. But that's due to what ever is stopping it from reving out.

And once again thanks guys you've been great. All of you.

Just can't wait to sort the problem. But I'll get there and like I've said if there is anyone in or around sheffield. I will gladly pay them to either have a go at getting it to be able to reach the band. Or to help me to do it.

Thanks lads it's just doing my head in that I can't sort it or go for a ride and enjoy it

[Sdrobo]

Well just an update it's still the same I've ordered some new jets a in line fuel filter. I haven't had no where near the help you guys have given. My apologies for posting in the workshop bit I just was going on advise didn't mean to offend anyone or be disrespectful. And thank you for all the help and advice you have given me I will keep you all posted as to how I get on. If anyone has any other ideas please let me know

[Sdrobo]

Oh yes forgot to mention. I've found that even tho my power valve is lined up right number 2 cable adjuster the bolt has broke so there is some in the hole and a bit with the nut on resting on it could this be it ? And does anyone have a spare cable I could buy ?

[M.C]

[Sdrobo]

I've found a cdi on ebay for 100 quid that says it's open 17kw would this fix the issue?

[P.]

[M.C]

Got to say this will make me question recent rebuild adverts a bit more now. Rebuilt by whom and using what parts