DT125R ARCHIVE

gooner78 · gooner78

Do they make much of a difference i've got one that i will be fitting once i get my cylinder back from being rebored and are there any other adjustments i need to do to once its fitted thanks

grifter · grifter

Hi guys, i have recently had a new engine (recon) put in my bike was fine at first flies when pv kicks in. Just my top speed is dog poo i only get about 55-57mph also i have noticed some oil?? leaking from the rivets in the exhaust and some oil spatter marks on the casing near the pv (see pic). Any help would be a...

gooner78 · gooner78

After i finished my topend rebuild the other week i was filling up the rad and bleeding the system i went to top up the expansion bottle and the coolant that was already in there looked like it has not been circulating for ages it was dirty and there was like a tide mark that had formed in the expansion bottl...

mr karnage · mr karnage

just bought practical sportbikes mag just for the reason it had a tzr250 in so the guy had put in a stepped woodruff key, increasing the timing to +4 degrees advanced now ive been looking this up and its quite a common mod one guy put a +7 degrees advanced key on his dt and said it flew i know that the standard...

steve0200 · steve0200

hi guys ive just bought a 1999 dtr its completly standard and untouched,everything seems to be workig as it should,it starts 1st or second kick,it ticks over fine,and revs ok in nutral(it spluters abit in high revs )when i ride it its ok untill 6k revs then it just coughs and spluters,it does that in eve...

ShaunyBoy · ShaunyBoy

hi guys, a friend from work has a aprillia mx (2010), after work we started our bikes and smoked a ciggy whilst they warmed up.... we cruised down the high street at simular speeds (not pushing it) we both pulled up at the red light and knew we where going to have alittle race. my dt was mush slower than his m...

gooner78 · gooner78

Do you really have to run it in for 500 miles i've had quick look online and some say 3 heat cycles and some say do not go above half throttle for 200 miles and some say just ride it as normal i,ve only done 6 miles on the new top end riding it gently its going to take ages as i only do around 20 miles a week:disbeli...

R10BJN · R10BJN

Hi all, Im new to this forum so a big hi to everyone before I start. Ive bought a 03 plate DTR with an Athena 170cc barrel on. It also has a full dep sport exhaust and the plug in the clocks has been disconected. The snorkal has been removed and its running a 240 main jet. The bike runs well and has plenty of powe...

Uhe-95 · Uhe-95

Hi, my bike dies when i give full throttle and the bike is in neutral! I fixed it one time by adjusting the power valve then i drove it for a couple of miles and then it fu*ked up again :P maybe the power volve adjuster is not working properly? Does any one know? :D Please Help :D Thanks for answers :D P.S Sor...

northy2111 · northy2111

Hi all I've recently had a rebore, new piston and rings,small end bearing head gaskit etc all done by professional .The problem I have now is that my engine sounds a bit rough, it was run in correctly and goes really well now(800 miles since rebore).The sound is mainly when comming off the throttle, mea...

ShaunyBoy · ShaunyBoy

cant find the step by step guide to derestricting my bike can anyone help?

gasto · gasto

While it's cold everything seems ok,Starts easy and idling fine.Once it get hot,over 75-80C the bike is bogging like it runs out of fuel and dies.It only starts with the choke on but once i open the throttle dies.If it get cold it runs nice again.The carb is cleaned.What else should i check?

NathanDavies · NathanDavies

http://www.ebcbrakesdirect.com/bike/parts_clutch.asp?part=clutch&make=YAMAHA&model=51to125&year=DT+125+R+%2888-03%29&sec=#

DTR_NW · DTR_NW

so in first gear when i set off at 8000 rpm it sunds like its straining and theres loss of power like it needs more air or something but 2 3 4 5 6 are all perfect any ideas on whats causing this ??? or is 1st gear just a very short gear on DTRs only ever had a DTX

gareth_iowc · gareth_iowc

evening all, what are the signs of a lean mixture? at low and high revs? thanks

2T_Toe · 2T_Toe

I've got a DT230 engine but I'm looking into running it on on a 125 loom and cdi so I can get rid of the traction control system it comes fitted with. After having a look over the 230 lump, there is a small black unit/cylinder fitted to the oil feed line between the oil pump and the carb. It's fitted just a...

dillboi1988 · dillboi1988

wonder if one of you could help me-my dtr 03 plate is spluttering like made whenever coming into the power band,its not so bad in lower gears but certainly alot worse in higher gears- i pulled onto the motorway and recently it has been spluttering sort of bogging then accelerating bogging then accel...

ezegreenfingers · ezegreenfingers

Got. A 2002 dtr 125 does any body no why it's slower than my kx 8o would a new piston and rings make a lot of difference

NorDt · NorDt

Okay. I got a case. I have 2 engines. one stock that has never been opened up. done 25 000 km. Thats not alot really. And then i have my own engine. wich has done 43 000 km. But has new main bearings and crank. My problem is that my own engine that is 100% perfect condition with all new crank and bearings. Has...

Reef · Reef

Alrite lads, havnt been on the dt for a couple of weeks now due to working a lot but today i had the time to get it out to take it to work. Thing is when i was riding down i needed to stop somewhere so i turned it off for a couple of mins and when i came to turn it on with the key it didnt want to, meaning it didnt want to...

mr karnage · mr karnage

so when the bikes on a stand where the wheel is up in the air its fine but when i put it down and wheel it, it sometimes pulls like its in first gear and i can hear the piston on its revolution but it goes away and starts again when it wants to. also i cant kick it without the clutch in the nuetral light is on and it...

NorDt · NorDt

So my bike has all of a sudden startded going from 1st to neutral when i want it to go in 2nd. And sometimes when it goes into 2nd. It jumps back to neutral after 1-2 seconds. Is my gears starting to brake. Or is this most likely a oil problem ? too much / wrong oil ?

DTR-POWERVALVE-FTW · DTR-POWERVALVE-FTW

whats involed when u replace a bore do u need a new piston etc .... can i use a second hand barrel? help :(

gooner78 · gooner78

can anyone recommend a decent place to have the bottom end of my dtr rebuilt thanks.

Calum122 · Calum122

So I was having an argument with my friend. We always argue and I swear each and everytime we argue he is ALWAYS right! I'm only arguing because what he says is just so out of the ordinary. Anyway... He reckons that an RD350 engine should fit in a DT frame with a none or a little bit of modification to the fra...

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
	3MB Cylinder Head (Preview) Do they make much of a difference i've got one that i will be fitting once i get my cylinder back from being rebored and are there any other adjustments i need to do to once its fitted thanks	gooner78	23	433	Oct 1, 2012 by Cameron
	Help needed please (Preview) Hi guys, i have recently had a new engine (recon) put in my bike was fine at first flies when pv kicks in. Just my top speed is dog poo i only get about 55-57mph also i have noticed some oil?? leaking from the rivets in the exhaust and some oil spatter marks on the casing near the pv (see pic). Any help would be a...	grifter	8	161	Sep 26, 2012 by tripr
	expansion bottle (Preview) After i finished my topend rebuild the other week i was filling up the rad and bleeding the system i went to top up the expansion bottle and the coolant that was already in there looked like it has not been circulating for ages it was dirty and there was like a tide mark that had formed in the expansion bottl...	gooner78	3	126	Sep 14, 2012 by NEV
	stepped woddruff key/advanced ignition timing (Preview) just bought practical sportbikes mag just for the reason it had a tzr250 in so the guy had put in a stepped woodruff key, increasing the timing to +4 degrees advanced now ive been looking this up and its quite a common mod one guy put a +7 degrees advanced key on his dt and said it flew i know that the standard...	mr karnage	16	202	Sep 13, 2012 by mr karnage
	1999 dtr coughs and spluters at 6k revs(its fine untill then) any ideas? (Preview) hi guys ive just bought a 1999 dtr its completly standard and untouched,everything seems to be workig as it should,it starts 1st or second kick,it ticks over fine,and revs ok in nutral(it spluters abit in high revs )when i ride it its ok untill 6k revs then it just coughs and spluters,it does that in eve...	steve0200	14	168	Sep 4, 2012 by eG x LoGiKzZ
	im gonna need some help (Preview) hi guys, a friend from work has a aprillia mx (2010), after work we started our bikes and smoked a ciggy whilst they warmed up.... we cruised down the high street at simular speeds (not pushing it) we both pulled up at the red light and knew we where going to have alittle race. my dt was mush slower than his m...	ShaunyBoy	28	227	Sep 1, 2012 by NEV
	Running in a new piston (Preview) Do you really have to run it in for 500 miles i've had quick look online and some say 3 heat cycles and some say do not go above half throttle for 200 miles and some say just ride it as normal i,ve only done 6 miles on the new top end riding it gently its going to take ages as i only do around 20 miles a week:disbeli...	gooner78	5	137	Aug 29, 2012 by NORFE
	Running Problems (Preview) Hi all, Im new to this forum so a big hi to everyone before I start. Ive bought a 03 plate DTR with an Athena 170cc barrel on. It also has a full dep sport exhaust and the plug in the clocks has been disconected. The snorkal has been removed and its running a 240 main jet. The bike runs well and has plenty of powe...	R10BJN	16	221	Aug 27, 2012 by R10BJN
	DT125X dies when full throttle, in neutral. Help! dt bike dt125x 125 power valve exhaust (Preview) Hi, my bike dies when i give full throttle and the bike is in neutral! I fixed it one time by adjusting the power valve then i drove it for a couple of miles and then it fu*ked up again :P maybe the power volve adjuster is not working properly? Does any one know? :D Please Help :D Thanks for answers :D P.S Sor...	Uhe-95	5	1544	Aug 23, 2012 by Uhe-95
	Rattle noise when I slow down (Preview) Hi all I've recently had a rebore, new piston and rings,small end bearing head gaskit etc all done by professional .The problem I have now is that my engine sounds a bit rough, it was run in correctly and goes really well now(800 miles since rebore).The sound is mainly when comming off the throttle, mea...	northy2111	8	174	Aug 22, 2012 by GADGET
	derestricting (Preview) cant find the step by step guide to derestricting my bike can anyone help?	ShaunyBoy	2	124	Aug 16, 2012 by Calum122
	Bike dies when gets hot. (Preview) While it's cold everything seems ok,Starts easy and idling fine.Once it get hot,over 75-80C the bike is bogging like it runs out of fuel and dies.It only starts with the choke on but once i open the throttle dies.If it get cold it runs nice again.The carb is cleaned.What else should i check?	gasto	6	173	Jul 17, 2012 by NEV
	Clutch kit? (Preview) http://www.ebcbrakesdirect.com/bike/parts_clutch.asp?part=clutch&make=YAMAHA&model=51to125&year=DT+125+R+%2888-03%29&sec=#	NathanDavies	7	351	Jul 12, 2012 by NORFE
	weird gearing ?? (Preview) so in first gear when i set off at 8000 rpm it sunds like its straining and theres loss of power like it needs more air or something but 2 3 4 5 6 are all perfect any ideas on whats causing this ??? or is 1st gear just a very short gear on DTRs only ever had a DTX	DTR_NW	7	174	Jul 12, 2012 by gareth_iowc
	lean mixture (Preview) evening all, what are the signs of a lean mixture? at low and high revs? thanks	gareth_iowc	3	188	Jul 12, 2012 by gareth_iowc
	DT230 oil feed question (Preview) I've got a DT230 engine but I'm looking into running it on on a 125 loom and cdi so I can get rid of the traction control system it comes fitted with. After having a look over the 230 lump, there is a small black unit/cylinder fitted to the oil feed line between the oil pump and the carb. It's fitted just a...	2T_Toe	6	163	Jul 9, 2012 by the only way is YAMAHA DTR
	bike spluttering also lossin water from expansion bottle (Preview) wonder if one of you could help me-my dtr 03 plate is spluttering like made whenever coming into the power band,its not so bad in lower gears but certainly alot worse in higher gears- i pulled onto the motorway and recently it has been spluttering sort of bogging then accelerating bogging then accel...	dillboi1988	14	233	Jul 8, 2012 by DTrick125sm
	What's wrong with it (Preview) Got. A 2002 dtr 125 does any body no why it's slower than my kx 8o would a new piston and rings make a lot of difference	ezegreenfingers	0	132	Jul 7, 2012 by ezegreenfingers
	Need some advice. got two engines. Wich one do i tune ? (Preview) Okay. I got a case. I have 2 engines. one stock that has never been opened up. done 25 000 km. Thats not alot really. And then i have my own engine. wich has done 43 000 km. But has new main bearings and crank. My problem is that my own engine that is 100% perfect condition with all new crank and bearings. Has...	NorDt	9	165	Jul 4, 2012 by NorDt
	RE Not turning on properly :/ (Preview) Alrite lads, havnt been on the dt for a couple of weeks now due to working a lot but today i had the time to get it out to take it to work. Thing is when i was riding down i needed to stop somewhere so i turned it off for a couple of mins and when i came to turn it on with the key it didnt want to, meaning it didnt want to...	Reef	1	94	Jun 30, 2012 by NEV
	weird problem after rebuild ( 1 2 ) (Preview) so when the bikes on a stand where the wheel is up in the air its fine but when i put it down and wheel it, it sometimes pulls like its in first gear and i can hear the piston on its revolution but it goes away and starts again when it wants to. also i cant kick it without the clutch in the nuetral light is on and it...	mr karnage	46	516	Jun 30, 2012 by mr karnage
	Bike jumping from 2nd gear to neutral.. (Preview) So my bike has all of a sudden startded going from 1st to neutral when i want it to go in 2nd. And sometimes when it goes into 2nd. It jumps back to neutral after 1-2 seconds. Is my gears starting to brake. Or is this most likely a oil problem ? too much / wrong oil ?	NorDt	2	124	Jun 28, 2012 by NorDt
	cracked bore :( (Preview) whats involed when u replace a bore do u need a new piston etc .... can i use a second hand barrel? help :(	DTR-POWERVALVE-FTW	3	174	Jun 25, 2012 by DTR-POWERVALVE-FTW
	bottom end rebuild (Preview) can anyone recommend a decent place to have the bottom end of my dtr rebuilt thanks.	gooner78	2	138	Jun 25, 2012 by fused420
	RD350 Engine Rd 350 DT Conversion Swap (Preview) So I was having an argument with my friend. We always argue and I swear each and everytime we argue he is ALWAYS right! I'm only arguing because what he says is just so out of the ordinary. Anyway... He reckons that an RD350 engine should fit in a DT frame with a none or a little bit of modification to the fra...	Calum122	9	1877	Jun 24, 2012 by Power valve kid
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