DT125R ARCHIVE

flydnb · flydnb

as it has a servo ?

swallow · swallow

Hello All - my first technical post here, so please be gentle. I am just starting to strip down and rebuild my dt125r 1993 (3rn6) engine that I shall be using in a project bike. On examination, the 3MB00 cylinder that is fitted is a unit which has a powervalve that is fixed in position and has no servo unit o...

AndyYam · AndyYam

Has anyone had an experience with bringing back the powervalve afer a rebore. I was skeptical at first but it appears you do have to do work on the valve to stop it rubbing on the piston after a rebore or two. Does anyone know how much need to be taken off or had any general experience with this?

Jack_92dtr · Jack_92dtr

Hellloooo, I'm going to attempt my first top end rebuild, Just wondering how you disconnect the powervavle help would be much appreciated Thanks

Cameron · Cameron

So I'm riding along, minding my own business when this decides to eject itself from the engine. Mate had to ride round the woods trying to find a bit of cable to tow my back lol, been towed back to...

NorDt · NorDt

So found the reason my dt hasnt been as fast as it should. Turns out the screw that holds the two parts of the powervalve together has loosened, So only the side with the wires to it has been working. And the other part has been stuck and this has made the surface of them ugly and a bit bashed. So i will be buyi...

gooner78 · gooner78

It is stuck solid when the covers on when you take the cover off it works a treat is there a knack to it thanks

zooankski · zooankski

[URL=https://s691.photobucket.com/albums/vv278/zooankski/DT125r/?action=view&current=P8030253-1.mp4][IMG]https://i691.photobucket.com/album...

zooankski · zooankski

http://img708.imageshack.us/img708/7196/zk0ufebngbxrdwwlndhdqz.mp4

coastie123 · coastie123

http://dt125r.activeboard.com/t25126106/pinning-the-powervalve-open-on-a-dtr/

DTR_NW · DTR_NW

so i took the power valve out turned bike on let it do its reset cleaning cycle put the power valve in so its fully open now when i set off on the bike its bogging down all way to 7k then after 7k its monstrous goes like a bat out of hell but i cant ride the bike normals like when im just looking to trundle to work i d...

DTR_NW · DTR_NW

can anyone show me some pictures of what it looks like up the exhaust how it should look when its ideling and what it looks like on throttle thanks guys

CarlosRexx · CarlosRexx

Has almost stopped. My powervalve used to make the dinstinctive noise when the ignition is turned on, now all I get is a weak whirring and sounds like it's struggling to do the cycle.. Any ideas? The battery is fine and all lights work without fail and no dimming..

lee_92 · lee_92

Hi I was wondering if anybody knows the length on the power valve cables by any chance, ive got a 03 dtr and the cables on mine are straight and do not cross in case that helps.

DTR_NW · DTR_NW

so i bought a dt 125 from local scrappy stolen recoverd all wiring been butcherd so im gna turn it into a crosser it starts up on kick start all works perfect even the kill switch works but theres no battery and the looms been cut where the battery usualy is so my question is there anywher i can wire up the po...

cairnsy · cairnsy

does anyone know how to get more power from a dtr sm.it allready has dep exhaust and upgraded jets in carb but seems to be flat unless powervalve is jammed open.is it ok to jam it open permanently?

dreamwoofwoof · dreamwoofwoof

just did mine today still got oil on hands :) iv got an 07 bike what i did First i removed the plastis and got to the servo. Then i got the 2 cables that go to the servo and slacked them off so they was lose. Then removed the exhaust so i could get my finger in the port to feel for the value, the value is about 1-2...

podge209 · podge209

hi all, i have recently bought a yamaha dtr125 for off road use, it is the model with the power valve servo on etc etc, i took off the exhaust and lined the power valve up so its fully open, and when i put it all back together it was still open, but when i start the bike the power vale shuts opens then st...

alphamale · alphamale

Hello, I just bought a complete servo kit for my 1990DTR, Installed it with no problems (part from the fact the instructions on here do not tell you that you need to remove the exhaust as I found out half way through) When I turn the key at start up you can see the pully doing its job, eg moves backwards and fo...

john01 · john01

http://www.dtr125.net/videohtml/ypvs/powervalve_files/pic10.jpg

craiggaler · craiggaler

i have a dt125r 1995 it was fine the powervalve was open fully and was coming in at about 6000rpm whitch i was happy with now ive fitted a fresco front pipe and the powervalve comes in at 7500rpm whitch is far to late and when i get into 6th gear the bike dies and slows right down. can any body help

john01 · john01

hi i recently bourght a 97 dt125r. i am looking for a power valve and have found one. the fitting on my bike is the 2 prong one but the one for sale is the 3 prong one but the guy said there is a way of putting the 3 prong one on my 2 prong bike. is this ture, can it be done? thank you very much john landells.

apexer0 · apexer0

i have a 91 dt125r with a 88 engine i bough a power vale servo from a dt but its the 5 wire one , it came with a tzr125 control box which i have wired up and appears to work wot i would like to know is wot the valve should be doing when engine is running

speedplay · speedplay

What tells the powervalve servo motor to work...? Please tell me it isnt attached to the rev counter....as I dont have one:( Rob

Topic		Started By	Replies	Views	Last Post
	will a low battery affect the powervalve. (Preview) as it has a servo ?	flydnb	4	143	Jan 31, 2013 by the only way is YAMAHA DTR
	Static Powervalve Options (Preview) Hello All - my first technical post here, so please be gentle. I am just starting to strip down and rebuild my dt125r 1993 (3rn6) engine that I shall be using in a project bike. On examination, the 3MB00 cylinder that is fitted is a unit which has a powervalve that is fixed in position and has no servo unit o...	swallow	3	136	Jan 15, 2013 by AndyYam
	Powervalve machining after re bore. (Preview) Has anyone had an experience with bringing back the powervalve afer a rebore. I was skeptical at first but it appears you do have to do work on the valve to stop it rubbing on the piston after a rebore or two. Does anyone know how much need to be taken off or had any general experience with this?	AndyYam	7	182	Jan 8, 2013 by dread123
	Disconnecting the powervalve (Preview) Hellloooo, I'm going to attempt my first top end rebuild, Just wondering how you disconnect the powervavle help would be much appreciated Thanks	Jack_92dtr	3	149	Jan 7, 2013 by Jack_92dtr
	Broke it again! (Preview) So I'm riding along, minding my own business when this decides to eject itself from the engine. Mate had to ride round the woods trying to find a bit of cable to tow my back lol, been towed back to...	Cameron	24	235	Oct 1, 2012 by Cameron
	Athena 170cc powervalve ****ed. (Preview) So found the reason my dt hasnt been as fast as it should. Turns out the screw that holds the two parts of the powervalve together has loosened, So only the side with the wires to it has been working. And the other part has been stuck and this has made the surface of them ugly and a bit bashed. So i will be buyi...	NorDt	11	217	Sep 1, 2012 by NorDt
	powervalve will not work (Preview) It is stuck solid when the covers on when you take the cover off it works a treat is there a knack to it thanks	gooner78	2	117	Aug 20, 2012 by AndyYam
	Power valve installation (Preview) [URL=https://s691.photobucket.com/albums/vv278/zooankski/DT125r/?action=view&current=P8030253-1.mp4][IMG]https://i691.photobucket.com/album...	zooankski	4	724	Aug 5, 2012 by AndyYam
	power valve test (Preview) http://img708.imageshack.us/img708/7196/zk0ufebngbxrdwwlndhdqz.mp4	zooankski	0	131	Aug 4, 2012 by zooankski
	powervalve pinning!! (Preview) http://dt125r.activeboard.com/t25126106/pinning-the-powervalve-open-on-a-dtr/	coastie123	11	233	Jul 11, 2012 by AndyYam
	Sorted Power Valve bike is weird now (Preview) so i took the power valve out turned bike on let it do its reset cleaning cycle put the power valve in so its fully open now when i set off on the bike its bogging down all way to 7k then after 7k its monstrous goes like a bat out of hell but i cant ride the bike normals like when im just looking to trundle to work i d...	DTR_NW	10	132	Jul 10, 2012 by DTR_NW
	Think my PV is setup wrong (Preview) can anyone show me some pictures of what it looks like up the exhaust how it should look when its ideling and what it looks like on throttle thanks guys	DTR_NW	5	190	Jul 9, 2012 by DTR_NW
	The whirring.. (Preview) Has almost stopped. My powervalve used to make the dinstinctive noise when the ignition is turned on, now all I get is a weak whirring and sounds like it's struggling to do the cycle.. Any ideas? The battery is fine and all lights work without fail and no dimming..	CarlosRexx	6	149	Jun 15, 2012 by NEV
	power valve cable length (Preview) Hi I was wondering if anybody knows the length on the power valve cables by any chance, ive got a 03 dtr and the cables on mine are straight and do not cross in case that helps.	lee_92	2	99	May 19, 2012 by lee_92
	crosser power valve (Preview) so i bought a dt 125 from local scrappy stolen recoverd all wiring been butcherd so im gna turn it into a crosser it starts up on kick start all works perfect even the kill switch works but theres no battery and the looms been cut where the battery usualy is so my question is there anywher i can wire up the po...	DTR_NW	4	181	Mar 30, 2012 by tripr
	2006 dtr sm lacking power (Preview) does anyone know how to get more power from a dtr sm.it allready has dep exhaust and upgraded jets in carb but seems to be flat unless powervalve is jammed open.is it ok to jam it open permanently?	cairnsy	3	318	Apr 2, 2011 by cairnsy
	just did my power value 07 bike (Preview) just did mine today still got oil on hands :) iv got an 07 bike what i did First i removed the plastis and got to the servo. Then i got the 2 cables that go to the servo and slacked them off so they was lose. Then removed the exhaust so i could get my finger in the port to feel for the value, the value is about 1-2...	dreamwoofwoof	6	364	May 23, 2009 by dreamwoofwoof
	powervalve fun (Preview) hi all, i have recently bought a yamaha dtr125 for off road use, it is the model with the power valve servo on etc etc, i took off the exhaust and lined the power valve up so its fully open, and when i put it all back together it was still open, but when i start the bike the power vale shuts opens then st...	podge209	11	669	Jun 9, 2008 by Ry23
	Powervalve servo malfunction? (Preview) Hello, I just bought a complete servo kit for my 1990DTR, Installed it with no problems (part from the fact the instructions on here do not tell you that you need to remove the exhaust as I found out half way through) When I turn the key at start up you can see the pully doing its job, eg moves backwards and fo...	alphamale	10	449	Sep 13, 2007 by alphamale
	does any one have a apare powervalve (Preview) http://www.dtr125.net/videohtml/ypvs/powervalve_files/pic10.jpg	john01	3	231	Aug 13, 2007 by john01
	powervalve problems (help) (Preview) i have a dt125r 1995 it was fine the powervalve was open fully and was coming in at about 6000rpm whitch i was happy with now ive fitted a fresco front pipe and the powervalve comes in at 7500rpm whitch is far to late and when i get into 6th gear the bike dies and slows right down. can any body help	craiggaler	20	534	Jun 20, 2007 by craiggaler
	power valve (Preview) hi i recently bourght a 97 dt125r. i am looking for a power valve and have found one. the fitting on my bike is the 2 prong one but the one for sale is the 3 prong one but the guy said there is a way of putting the 3 prong one on my 2 prong bike. is this ture, can it be done? thank you very much john landells.	john01	1	288	May 29, 2007 by dtrworld2
	wot is the corect sut up for a power valve (Preview) i have a 91 dt125r with a 88 engine i bough a power vale servo from a dt but its the 5 wire one , it came with a tzr125 control box which i have wired up and appears to work wot i would like to know is wot the valve should be doing when engine is running	apexer0	2	552	Feb 14, 2007 by apexer0
	powervalve (Preview) What tells the powervalve servo motor to work...? Please tell me it isnt attached to the rev counter....as I dont have one:( Rob	speedplay	3	389	Jul 13, 2006 by brad
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