DT125R ARCHIVE

dougie175 · dougie175

Ok I know there are loads of loads of topics on de-restricting DT 125's on here. However Im wondering for my own personal use whats worth doing? Im more interested in acceleration than top end as the bike is used more off road. I have a 2003 model which I believe has the white box in the back of the clocks, an...

mark2010 · mark2010

Hi sorry for the dumb question but im having problems with a leak I thought i had put too much coolant in the expansion tank so i took some out checked the level in the rad then took it out for a spin. When it had cooled i went and checked the rad and the level had gone down and the expansion tank had filled up aga...

mark2010 · mark2010

Hi Ive just drained and refilled the coolant and my bike and after i have rode it for about 10 mins i get coolant coming out of the pipe running from the expansion tank into the frame Any ideas would be appreiciated Thanks Mark

marko727 · marko727

I've received lots of help from reading the rebuild topics on this forum, but few things seem to be unclear. I know I have to get a: New piston (1mm oversize Im thinking, cylinder appears boreable, piston had only marking 25 and same 3mb00 marking or something, that cylinder had) New rings New bottom ga...

roadblock321 · roadblock321

how can i tell if my 2 stroke pump is not working if so will the bike blow out lots of smoke

ben350 · ben350

Just had a look today as I was stripping some spare cylinders down for parts and it does in fact look like the bobbin protrudes into the cylinder by a mm or so. Appologies to who ever I said it did not. Ben -- Edited by ben350 on Saturday 14th of March 2009 11:59:49 AM

born2race · born2race

DO YOU THINK ITS POSSIABLE TO FIT A GSXR600 ENGINE IN A DT 125 X LOL OR A HYABUSA ENGINE IN A DT 50 OR YOU THINK THAT WOULD BE A BIT CRAZY BTW EGGS DONT ROLL AND IF YOU THINK THEY DO,, WELL YOUR SADLY MISTAKEN HA IF YOU READ THEN YOUR BLIND BECAUSE THE PRICE OF BACON = EGGS DONT ROLL + YA MUM = BINLARDEN BUD BUD DING 2....

marko727 · marko727

Hello there. I don't know what else to do so I'm posting here to get some help. I bought a Yamaha DT125R, 2001 version. Everything seems to be really okay, except it wont rev over 7000 rpm with third or more gear. First two gears go into red area of rev meter. It sometimes revs over 7000 rpm when standing sti...

marko727 · marko727

DT125R, 2001 When I bought it, I didn't know it would get that hot. I changed the coolant, but the problem remained. Even riding on regular roads it gets near to red temp area. Today I went to the forest and it was quite muddy and rough and after every 200 meters the temperature was on red again. My friend wh...

Blinners · Blinners

Hi people new to the forum quick two for you need some good 2 stroke oil (the smell of Castrol R would be nice) advise please. also when to change the gear oil 2003 DTR125 1700 MILES THANK YOU

DTPOWER · DTPOWER

i've tried everything including adjusting the carb cleaning the airfilter, changing the sparkplug. and the bike still has a hard time reving past 6000 rpm i dont think it's time for a rebuild bc the bike has only 7000 KM on it. if someone could help me to solve this problem it would be highly appreciated...

AndyA · AndyA

I have de-resticted my wifes DT125R 2002 i.e. Reed switch/ taken out restrictor in front pipe/ Big one tail pipe/ inlet manifold mod and fitted boyesen reeds, it goes well up to 7500rpm then splutters and goes no further i have tried 240/ 250/ 260 jets and needle in the middle and both notches down from t...

alzabhoy · alzabhoy

hi can any dt125x owner's help me out i have to get my front wheel on my dt125x respoked but before the guy can do it..i need too no the offset..any help would be superb..thanx alza

shady dtr · shady dtr

could do with some help plese lads ive got 2003 dtr there is a tapping noise coming from pv or head reason i think pv is couse i took right side pv cover off and u can move the pin [with the off center allen key in it] slightly and taps on caseing or is this couse i took cover off. do covers and bushes in pv wear do...

polsta · polsta

i think my bike may be running too much oil, bike was fine when i put it in the shed yesterday, got it out earlier, it started and ran for about a mile then started chugging and wouldnt rev properly,then lost power and wouldnt start luckily was just up the road so rolled it home, checked the plug and it was a...

gooner78 · gooner78

As title says the powerband starts to kick in about 8000rm then the bike just stops reving it sits contantly at 10000rpm no matter what gear your in i,ve gutted the exhuast removed, speedo restriction i cleaned the air filter and put new spark plug in the power valve is working as i can hear it when i put th...

polsta · polsta

Hello lads how we all doing ??? those of you will remember me, aa, gixer gav etc , nice to be back !! been busy over the last 6 months, passed my driving test about 5 weeks ago and got me a 186 mk3 ford escort on the road, been loving it !! now the nice weather is here ive had my bottom end re built, new conrod,cran...

dtrcruzer · dtrcruzer

how easy is it to fit new jets in carbs???

macrae · macrae

when starting my DTX i have to hold the starter botton in to get it turning over and then let go for it to start!!! When left 4 a week, it takes about 5 minutes to start. There is a knack to it. when i bought 6 wks ago, The prevoius owner said he had it like it. Any ideas? Cheers Luke

ryan 90 · ryan 90

Found a good website that supply Mitaka piston kits for DT's thought id share it with you guys incase you need it. (hopefully not) http://www.pjme.co.uk/ -- Edited by ryan 90 on Friday 17th of April 2009 08:17:38 PM

tazard · tazard

my mates been working on my bike and sayiing how much he likes it then last night said did i wanna sell it cause he thinks its got petrol in the gear box is that possible it rides fine it just uses more petrol than it should it was doing 23 miles to the gallon but i think that because the carb gasket is shot so im g...

djpaulg · djpaulg

hi everyone, Basically bought a dt-re a few months back after years of wanting one, its on a 56 plate, basically i'm wanting to fully open the power valve if poss, my bike has a full DEP fitted but apart from that i think its pretty basic. The bike will get me to 75mph no problem but after that it just stays th...

Gouldy · Gouldy

ok guys do any of you know where i can get a rear 57 tooth sprocket?

karl_skyline · karl_skyline

Hi I have a dtr 125 2002 one it wont rev fully to the red line almost like it hits a rev limiter or a missfire ive took the ring out the expansion chamber its got the standard rear silencer i havent done out with the reed switch but it used to rev to 10000 after doing the exhuast but now it wont but after doing the...

sheepie · sheepie

right having major engine probs and done a compression test and got 90psi and with a wee drop of oil down the barrel getting 105 psi just need to know if this is good or bad on a standerd 125dtr 02plate my engine symtoms are : starts first kick with no power and runs for few mins but then gets smokey and dies wi...

Sub Forum	Topics	Posts	Last Post
Coolant System - Read Only Sub-forums: FAQ (Coolant System)	22	273	Aug 31, 2015 by AndyYam
De-Restricting - Read Only	18	345	Apr 1, 2014 by Victor
Athena - Read Only	13	184	Sep 26, 2014 by Calum122
2t Oil - Read Only	18	167	Oct 14, 2014 by MDK

Topic		Started By	Replies	Views	Last Post
	What is really worth doing? (Preview) Ok I know there are loads of loads of topics on de-restricting DT 125's on here. However Im wondering for my own personal use whats worth doing? Im more interested in acceleration than top end as the bike is used more off road. I have a 2003 model which I believe has the white box in the back of the clocks, an...	dougie175	16	400	Jul 13, 2009 by neil
	Could someone please expain to me the workings of the radiator and the expansion tank !!! (Preview) Hi sorry for the dumb question but im having problems with a leak I thought i had put too much coolant in the expansion tank so i took some out checked the level in the rad then took it out for a spin. When it had cooled i went and checked the rad and the level had gone down and the expansion tank had filled up aga...	mark2010	14	422	Jul 9, 2009 by mark2010
	Coolant leaking from expansion tank............any ideas please ? (Preview) Hi Ive just drained and refilled the coolant and my bike and after i have rode it for about 10 mins i get coolant coming out of the pipe running from the expansion tank into the frame Any ideas would be appreiciated Thanks Mark	mark2010	10	341	Jul 9, 2009 by mark2010
	Engine rebuild (Preview) I've received lots of help from reading the rebuild topics on this forum, but few things seem to be unclear. I know I have to get a: New piston (1mm oversize Im thinking, cylinder appears boreable, piston had only marking 25 and same 3mb00 marking or something, that cylinder had) New rings New bottom ga...	marko727	10	388	Jul 7, 2009 by marko727
	2 stroke pump (Preview) how can i tell if my 2 stroke pump is not working if so will the bike blow out lots of smoke	roadblock321	8	270	Jul 6, 2009 by SimsonS51E
	YPVS bobbin + cylinder (Preview) Just had a look today as I was stripping some spare cylinders down for parts and it does in fact look like the bobbin protrudes into the cylinder by a mm or so. Appologies to who ever I said it did not. Ben -- Edited by ben350 on Saturday 14th of March 2009 11:59:49 AM	ben350	12	363	Jun 29, 2009 by neil
	ROLL!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! (Preview) DO YOU THINK ITS POSSIABLE TO FIT A GSXR600 ENGINE IN A DT 125 X LOL OR A HYABUSA ENGINE IN A DT 50 OR YOU THINK THAT WOULD BE A BIT CRAZY BTW EGGS DONT ROLL AND IF YOU THINK THEY DO,, WELL YOUR SADLY MISTAKEN HA IF YOU READ THEN YOUR BLIND BECAUSE THE PRICE OF BACON = EGGS DONT ROLL + YA MUM = BINLARDEN BUD BUD DING 2....	born2race	12	309	Jun 26, 2009 by born2race
	Another DT125R derestriction topic as I am really confused.. (Preview) Hello there. I don't know what else to do so I'm posting here to get some help. I bought a Yamaha DT125R, 2001 version. Everything seems to be really okay, except it wont rev over 7000 rpm with third or more gear. First two gears go into red area of rev meter. It sometimes revs over 7000 rpm when standing sti...	marko727	10	526	Jun 20, 2009 by marko727
	Getting hot quickly (Preview) DT125R, 2001 When I bought it, I didn't know it would get that hot. I changed the coolant, but the problem remained. Even riding on regular roads it gets near to red temp area. Today I went to the forest and it was quite muddy and rough and after every 200 meters the temperature was on red again. My friend wh...	marko727	23	574	Jun 20, 2009 by marko727
	Oils (Preview) Hi people new to the forum quick two for you need some good 2 stroke oil (the smell of Castrol R would be nice) advise please. also when to change the gear oil 2003 DTR125 1700 MILES THANK YOU	Blinners	6	296	Jun 18, 2009 by DTPOWER
	BIKE NOT REVING PAST 6000 rpm!!!!! rev problem yamaha dt 125 (Preview) i've tried everything including adjusting the carb cleaning the airfilter, changing the sparkplug. and the bike still has a hard time reving past 6000 rpm i dont think it's time for a rebuild bc the bike has only 7000 KM on it. if someone could help me to solve this problem it would be highly appreciated...	DTPOWER	22	3263	Jun 14, 2009 by born2race
	Advice on Jetting? (Preview) I have de-resticted my wifes DT125R 2002 i.e. Reed switch/ taken out restrictor in front pipe/ Big one tail pipe/ inlet manifold mod and fitted boyesen reeds, it goes well up to 7500rpm then splutters and goes no further i have tried 240/ 250/ 260 jets and needle in the middle and both notches down from t...	AndyA	14	518	May 28, 2009 by dtrcruzer
	dt125x owners i need help with front wheel (Preview) hi can any dt125x owner's help me out i have to get my front wheel on my dt125x respoked but before the guy can do it..i need too no the offset..any help would be superb..thanx alza	alzabhoy	6	294	May 20, 2009 by dtrcruzer
	i think tapping power valve (Preview) could do with some help plese lads ive got 2003 dtr there is a tapping noise coming from pv or head reason i think pv is couse i took right side pv cover off and u can move the pin [with the off center allen key in it] slightly and taps on caseing or is this couse i took cover off. do covers and bushes in pv wear do...	shady dtr	5	332	May 18, 2009 by shady dtr
	too much oil ? (Preview) i think my bike may be running too much oil, bike was fine when i put it in the shed yesterday, got it out earlier, it started and ran for about a mile then started chugging and wouldnt rev properly,then lost power and wouldnt start luckily was just up the road so rolled it home, checked the plug and it was a...	polsta	22	403	May 7, 2009 by tazard
	bike holding back and failing to redline (Preview) As title says the powerband starts to kick in about 8000rm then the bike just stops reving it sits contantly at 10000rpm no matter what gear your in i,ve gutted the exhuast removed, speedo restriction i cleaned the air filter and put new spark plug in the power valve is working as i can hear it when i put th...	gooner78	18	791	May 7, 2009 by tazard
	polsta back for the summer ,engine re built !!!!! (Preview) Hello lads how we all doing ??? those of you will remember me, aa, gixer gav etc , nice to be back !! been busy over the last 6 months, passed my driving test about 5 weeks ago and got me a 186 mk3 ford escort on the road, been loving it !! now the nice weather is here ive had my bottom end re built, new conrod,cran...	polsta	22	298	May 1, 2009 by polsta
	how easy is it?? (Preview) how easy is it to fit new jets in carbs???	dtrcruzer	11	292	May 1, 2009 by tazard
	DTX 05 (Preview) when starting my DTX i have to hold the starter botton in to get it turning over and then let go for it to start!!! When left 4 a week, it takes about 5 minutes to start. There is a knack to it. when i bought 6 wks ago, The prevoius owner said he had it like it. Any ideas? Cheers Luke	macrae	21	461	Apr 23, 2009 by born2race
	Piston Kits (Mitaka) (Preview) Found a good website that supply Mitaka piston kits for DT's thought id share it with you guys incase you need it. (hopefully not) http://www.pjme.co.uk/ -- Edited by ryan 90 on Friday 17th of April 2009 08:17:38 PM	ryan 90	9	585	Apr 23, 2009 by born2race
	is it posible for you to get petrol in your gearbox (Preview) my mates been working on my bike and sayiing how much he likes it then last night said did i wanna sell it cause he thinks its got petrol in the gear box is that possible it rides fine it just uses more petrol than it should it was doing 23 miles to the gallon but i think that because the carb gasket is shot so im g...	tazard	13	300	Apr 13, 2009 by tazard
	complete idiot needs help!! (Preview) hi everyone, Basically bought a dt-re a few months back after years of wanting one, its on a 56 plate, basically i'm wanting to fully open the power valve if poss, my bike has a full DEP fitted but apart from that i think its pretty basic. The bike will get me to 75mph no problem but after that it just stays th...	djpaulg	17	390	Apr 2, 2009 by SimsonS51E
	where can i get a rear 57 tooth sprocket? (Preview) ok guys do any of you know where i can get a rear 57 tooth sprocket?	Gouldy	8	248	Mar 26, 2009 by carl
	dtr 125 2002 wont fully rev ( 1 2 ) (Preview) Hi I have a dtr 125 2002 one it wont rev fully to the red line almost like it hits a rev limiter or a missfire ive took the ring out the expansion chamber its got the standard rear silencer i havent done out with the reed switch but it used to rev to 10000 after doing the exhuast but now it wont but after doing the...	karl_skyline	34	1057	Mar 25, 2009 by Gixergav
	what compression? (Preview) right having major engine probs and done a compression test and got 90psi and with a wee drop of oil down the barrel getting 105 psi just need to know if this is good or bad on a standerd 125dtr 02plate my engine symtoms are : starts first kick with no power and runs for few mins but then gets smokey and dies wi...	sheepie	13	390	Mar 14, 2009 by Gixergav
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