DT125R ARCHIVE

1990dtr (aka THIEF) · 1990dtr (aka THIEF)

after fitting a 28mm flatside after changing from some bottle lid carb i just cand get it to run right it just revs right up its not the air or idel screw any guesses guys seems a waste to bin it wen iv just bought it

1990dtr (aka THIEF) · 1990dtr (aka THIEF)

seem to have lost my front sprocket nut on a ride can you get a replaced from your local hardware store or are they difficult to match ?

neilmanns · neilmanns

ok my engine says 3BN also does my head, but my barrel says 3MB ??? is this right or not and any one know the dates of these numbers???

NORFE · NORFE

http://www.ebay.co.uk/itm/360391889036?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649#ht_5454wt_998

PatrickCMA · PatrickCMA

Hi all, I'm new here, just bought a DT125R for the winter. I have a small problem, I hope it hasn't been a topic in the past, but I can't find it. I checked the battery and it's dead. I bought a new one but I don't want to install it yet because there's something I don't trust. When I let the engine run, witho...

braddtr125 · braddtr125

My mains are on the way out as i can feel play in the flywheel. my questions are how long may it last like this and what will be the end result? siezing? bearing collapsing and need a new engine near enough. or will it plod on? also how big a job is it to do the mains, do i need any special tools to get them off the c...

1990dtr (aka THIEF) · 1990dtr (aka THIEF)

finally got round fitting a better carb on my dt upgraded 2 mm fited it after a long process of starting it i noticed it was chucking fuel out of the overflow under the carb and at low revs cutting out but wen i hit the power valve made a big diffrence so really want to get it working :)

timmy222 · timmy222

Hi Chaps, having decided to get back into motorbikes after 20 years I got hold of a dt 125r. She has had a rebore and has about 80 miles under her belt since. The bike is quick through the gears and pulls well upto 5000 rpm but then sort of feels groggy throttle wise. She will pull me up most hills in 6th gear so...

1990dtr (aka THIEF) · 1990dtr (aka THIEF)

i see alot of people say there bike do 80 , 90 some 100 but i can seem to get mine 1990 to budge over 70 and from 65 to 70 it seems to struggle any ideas to get quicker ?????

DT125XLewis · DT125XLewis

y0. Picked up a 2002 DT125R couple of weeks back, 1 previous owner and has just had a full rebuild. Ran it in for 500 miles and have now started giving it the beans. I have fitted a dep end can, taken out the reed switch and cut open the pipe and removed the restrictors and cat. But still when i get to 8000 revs t...

1990dtr (aka THIEF) · 1990dtr (aka THIEF)

dont know if any one would know or have the little bracket that the spark pick up soilnoid sit on ?????

sheldonherron · sheldonherron

http://www.youtube.com/watch?v=nf5hSk2y6l8 check it out i think it sounds mint for a 125 this is with the pv pegged open

Joe-2LT · Joe-2LT

Hi all, I am after some sprockets which will give me better top speed, I can get 80mph but that is screaming the bike, it sits nicely at 60mph on the way to work. 70 is in the powerband abit too. So i would like to comfortabley sit at 70mph not 60mph. Which sprocket set up to go for? I don't actually know what is...

1990dtr (aka THIEF) · 1990dtr (aka THIEF)

need some info on this carb pics to follow

dtx zac · dtx zac

Were should the pump be or what should line up with what ???

bagpuss · bagpuss

Hi guys i have a 1988 dt125 lc that splutters in the low revs then clears in mid range then splutters again in the higher revs. I have just had the barrel rebored, fitted a new coil and battery, the carb has been cleaned and the reed valve has been checked. when i took the bike out the other day it started fine...

Dufferz · Dufferz

Hey again guys! More problems now :( Serious cold starting difficulty, upon first attempt to start the bike revs to around ~3000rpm (with choke) as it should, then bogs out and dies.. Try kicking it again with the same choke position it'll hit about 1000rpm and bog out... and throttle use and it floods...

1990dtr (aka THIEF) · 1990dtr (aka THIEF)

i currently have a bottle top carb and i see you can get ones with 2 screws on the top instead witch one is better ???

azbo b29 · azbo b29

as above closed the powervalve so i dnt get a bit cheeky and end up on the back wheel lol

1990dtr (aka THIEF) · 1990dtr (aka THIEF)

bought a second hand 2 stroke pump fitted to my bike how much 2 stroke should it pump ? constant or dribble ?????

neilmanns · neilmanns

just put new piston and rings in and theres a slight rattle/vibrating noise coming from the top end ?? anyone else got this or had it havent rebored the barrel still standard 56mm pistin is a nice fit, it goes away when im hitting roughly 6k rpm or its still there and i cant hear itover my dep lol any ideas ??...

sheldonherron · sheldonherron

http://www.youtube.com/watch?feature=player_profilepage&v=nLHOut8EkEo

1990dtr (aka THIEF) · 1990dtr (aka THIEF)

Think my bije could do with a ring change as there only seems to be one ring on the piston i see piston kits on ebay ? non genuine will they wear quicker do they still wear the same ?

1990dtr (aka THIEF) · 1990dtr (aka THIEF)

just fitted a new 2 stroke pump to my 1990 dtr and people say the pipe go into in inlet manafold but i have no nippe for it to go too , were my friends newer bike does were does my one go all i can see it a clean gold nipple on the carb ???

romeopat · romeopat

i recently got a dt and i decided to change the oil after doing this and running the bike i noticed the engine oil has gone milky white? any ideas what this is...this is my first 125 2 stroke bike and to what i have read its something to do with water what am i best to do? any checks i can do myself?

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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
	wont idle !!! (Preview) after fitting a 28mm flatside after changing from some bottle lid carb i just cand get it to run right it just revs right up its not the air or idel screw any guesses guys seems a waste to bin it wen iv just bought it	1990dtr (aka THIEF)	1	139	Jan 1, 2012 by ash-ov-boro
	Sprocket Nut (Preview) seem to have lost my front sprocket nut on a ride can you get a replaced from your local hardware store or are they difficult to match ?	1990dtr (aka THIEF)	4	152	Dec 30, 2011 by carl13671
	erm ooooooooooook some one help ?? (Preview) ok my engine says 3BN also does my head, but my barrel says 3MB ??? is this right or not and any one know the dates of these numbers???	neilmanns	3	123	Dec 30, 2011 by DT-R_bradders
	30mm flat slide carb upgrade dtr 125 (Preview) http://www.ebay.co.uk/itm/360391889036?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649#ht_5454wt_998	NORFE	9	181	Dec 30, 2011 by NORFE
	6V on battery? (Preview) Hi all, I'm new here, just bought a DT125R for the winter. I have a small problem, I hope it hasn't been a topic in the past, but I can't find it. I checked the battery and it's dead. I bought a new one but I don't want to install it yet because there's something I don't trust. When I let the engine run, witho...	PatrickCMA	4	147	Dec 29, 2011 by PatrickCMA
	Main Bearings (Preview) My mains are on the way out as i can feel play in the flywheel. my questions are how long may it last like this and what will be the end result? siezing? bearing collapsing and need a new engine near enough. or will it plod on? also how big a job is it to do the mains, do i need any special tools to get them off the c...	braddtr125	4	163	Dec 29, 2011 by NORFE
	Carb pissing out fuel (Preview) finally got round fitting a better carb on my dt upgraded 2 mm fited it after a long process of starting it i noticed it was chucking fuel out of the overflow under the carb and at low revs cutting out but wen i hit the power valve made a big diffrence so really want to get it working :)	1990dtr (aka THIEF)	11	178	Dec 28, 2011 by bagpuss
	dt 125 r 2003 - lack of mid range power, awesome top range though! (Preview) Hi Chaps, having decided to get back into motorbikes after 20 years I got hold of a dt 125r. She has had a rebore and has about 80 miles under her belt since. The bike is quick through the gears and pulls well upto 5000 rpm but then sort of feels groggy throttle wise. She will pull me up most hills in 6th gear so...	timmy222	3	163	Dec 25, 2011 by Brewski92
	Speeeeeeed ! (Preview) i see alot of people say there bike do 80 , 90 some 100 but i can seem to get mine 1990 to budge over 70 and from 65 to 70 it seems to struggle any ideas to get quicker ?????	1990dtr (aka THIEF)	2	138	Dec 23, 2011 by Seanyftw
	2002 DT125R (Preview) y0. Picked up a 2002 DT125R couple of weeks back, 1 previous owner and has just had a full rebuild. Ran it in for 500 miles and have now started giving it the beans. I have fitted a dep end can, taken out the reed switch and cut open the pipe and removed the restrictors and cat. But still when i get to 8000 revs t...	DT125XLewis	2	125	Dec 23, 2011 by tripr
	pick up bracket (Preview) dont know if any one would know or have the little bracket that the spark pick up soilnoid sit on ?????	1990dtr (aka THIEF)	3	153	Dec 22, 2011 by 1990dtr (aka THIEF)
	SOUND TEST (Preview) http://www.youtube.com/watch?v=nf5hSk2y6l8 check it out i think it sounds mint for a 125 this is with the pv pegged open	sheldonherron	1	120	Dec 22, 2011 by RudiRulez
	What sprockets for better top end? (Preview) Hi all, I am after some sprockets which will give me better top speed, I can get 80mph but that is screaming the bike, it sits nicely at 60mph on the way to work. 70 is in the powerband abit too. So i would like to comfortabley sit at 70mph not 60mph. Which sprocket set up to go for? I don't actually know what is...	Joe-2LT	5	146	Dec 18, 2011 by DT-R_bradders
	need info on this carb (Preview) need some info on this carb pics to follow	1990dtr (aka THIEF)	1	125	Dec 16, 2011 by DT-R_bradders
	Throttle and oil position (Preview) Were should the pump be or what should line up with what ???	dtx zac	3	127	Dec 16, 2011 by DT-R_bradders
	bike starts when cold but not when hot? (Preview) Hi guys i have a 1988 dt125 lc that splutters in the low revs then clears in mid range then splutters again in the higher revs. I have just had the barrel rebored, fitted a new coil and battery, the carb has been cleaned and the reed valve has been checked. when i took the bike out the other day it started fine...	bagpuss	24	312	Dec 16, 2011 by bagpuss
	Cold starting issues.. (Preview) Hey again guys! More problems now :( Serious cold starting difficulty, upon first attempt to start the bike revs to around ~3000rpm (with choke) as it should, then bogs out and dies.. Try kicking it again with the same choke position it'll hit about 1000rpm and bog out... and throttle use and it floods...	Dufferz	3	172	Dec 14, 2011 by mr karnage
	Carbs witch is better (Preview) i currently have a bottle top carb and i see you can get ones with 2 screws on the top instead witch one is better ???	1990dtr (aka THIEF)	8	147	Dec 14, 2011 by 1990dtr (aka THIEF)
	how many miles to run in ? (Preview) as above closed the powervalve so i dnt get a bit cheeky and end up on the back wheel lol	azbo b29	8	157	Dec 13, 2011 by satelliteone
	2 stroke (Preview) bought a second hand 2 stroke pump fitted to my bike how much 2 stroke should it pump ? constant or dribble ?????	1990dtr (aka THIEF)	17	218	Dec 11, 2011 by GADGET
	rattle from top end after rebuild ?? (Preview) just put new piston and rings in and theres a slight rattle/vibrating noise coming from the top end ?? anyone else got this or had it havent rebored the barrel still standard 56mm pistin is a nice fit, it goes away when im hitting roughly 6k rpm or its still there and i cant hear itover my dep lol any ideas ??...	neilmanns	10	154	Dec 11, 2011 by tripr
	ypvs help please !! heres a video of setup, can someone please check for me (Preview) http://www.youtube.com/watch?feature=player_profilepage&v=nLHOut8EkEo	sheldonherron	2	113	Dec 9, 2011 by sheldonherron
	Piston rings (Preview) Think my bije could do with a ring change as there only seems to be one ring on the piston i see piston kits on ebay ? non genuine will they wear quicker do they still wear the same ?	1990dtr (aka THIEF)	21	192	Dec 9, 2011 by tripr
	2 stroke pip were does it go ???? (Preview) just fitted a new 2 stroke pump to my 1990 dtr and people say the pipe go into in inlet manafold but i have no nippe for it to go too , were my friends newer bike does were does my one go all i can see it a clean gold nipple on the carb ???	1990dtr (aka THIEF)	2	110	Dec 9, 2011 by 1990dtr (aka THIEF)
	DT125 2005RE white engine oil ( 1 2 ) (Preview) i recently got a dt and i decided to change the oil after doing this and running the bike i noticed the engine oil has gone milky white? any ideas what this is...this is my first 125 2 stroke bike and to what i have read its something to do with water what am i best to do? any checks i can do myself?	romeopat	35	782	Dec 8, 2011 by romeopat
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