DT125R ARCHIVE

mr karnage · mr karnage

when i bought it it started after about 10 kicks and it died after about 2 minutes. i stripped the bike and rebuilt it, havent touched the engine except from cleaning the carb, new gearbox oil and 2 stroke oil. ive got a spark and petrol is going through but it just doesnt want to start. also when i push the...

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

i was looking to get a K&n style filter to replace my standerd one as some idoit has drilled holes into it would it be better with the K&n style one or would it go beter standerd ?

Joe-2LT · Joe-2LT

on way to work this morning at 7.15am, dark, wet and windy! Just coming off the duel carridge way, dropped a gear and noticed that at the high end of the rev range it was spluttering badly. Then on the sliproad waiting in traffic, it conked out.... Started straight back up though. But was really strange....

Derbyian · Derbyian

When the power valve does it cycle/clean what way should it go?

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

i was looking to replace the piston and rings in my bike and i found this kit YAMAHA DT125R STANDARD 56.4MM PISTON KIT DT125 DT 88-90 from a place called bike devils for 30 pound would this last does any one know if it would be any good ?

Reef · Reef

Gonna replace all the oils and coolant before I start riding the dt properly but I need to ask for some advice regardin transmission oil.. In the manual it says I need sae1030 oil but after reading old transmission posts the only ones I can see recommended is 10-40 oil, silkolene?? Can you use 1040 or sho...

romeopat · romeopat

Hello again got an 05 re and the kick start only kicks when the bike is leant to the right I have re seated this a few times but if I try while bike is up as normal my foot goes straight down.....any ideas

DTPOWER · DTPOWER

okay so its time to get a new chain and sprockets ... i have never changed a chain or sprockets before. so... what are the sizes of the chain and sprockets that i should get ? i want an o-ring chain and i've checked with yamaha but they only had normal chains for normal prices.. so i've been searching Ebay fo...

kevin · kevin

Hey chaps, not been on here for a while after blowing the engine, losing interest and locking the dt in the shed for 5 months. Last week I got the enthusiasm back again, ordered all the parts and started stripping. Managed to get it all apart and back together again without to much hassle but now its all ba...

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

does any one know the carb setting for 1990 dtr

dt125lee · dt125lee

hi there i hear a Rough Noise When kicking the Bike Over as the bike dosent run properly yet i dont know if it still makes the noise when warm, the nosie sounds as if there is no oil in the crank but there is its a dry sound any help thanks :D

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

this seems a ovi question but new too all this the other day i took the power valve out of my bike to clean looking futher in i could see the piston and it looked like it only had one piston ring top one ? bottom missing the bike starts and rides bogs at low revs slow untill his 7 and a half ????

DangerousDave87 · DangerousDave87

alright guys, my bikes being a **** n the engines seized whilst I was trying to kick it over. Just looking for people's thoughts on my options, rebuild, new engine or bigger engine. any advice appreciated

Derbyian · Derbyian

I've got slightly milky oil in the gear box so going to change the water pump seal. Anything to be extra carefull of? Sounds like a pretty straight forward job? Any pointers will be appreciated

dt125lee · dt125lee

Hello there iv e got a 1998 dt125 and had to rebuild it from scratch anyway it starts up and runs for about 5 seconds and then bogs out, i have blown the jets out when i cleaned the carb shall i check the float in the car, and is there a idle screw on these Dt's many thanks :')

Dufferz · Dufferz

Any thoughts? Was just torquing it up... felt like it had plenty more to go and it snapped. bastard thing! ****ty bolt! its right inside, and i cant see a way to get it out..

Dufferz · Dufferz

Hey again guys... Having some serious issues with my bike again.. Symptoms: Not starting with no choke, with choke it starts, revs to about 5000rpm (by itself) then sounds like it floods out and dies. Tried: Top-end rebuild +2.00 (PV ground to suit), both crank seals, Carb mixture screw, jet needle p...

Derbyian · Derbyian

Speedo cable snapped, stripped the drive on the front wheel.... Full of mud and crap.... Cleaned it all out and put fresh grease in then fitted a new cable but it still don't work? Any info? Cheers

Derbyian · Derbyian

hi all.... new to the forum and could do with a little help just purchased a 2003 dt and wont rev past 7000 -7500rpm under load? but when free revving it wil reach 11000rpm ish. stripped and cleaned the power valve...set it up to the spec on the link. taken the reed switch out and put it out the way, engine nu...

dtr200691 · dtr200691

i know there are limitless post about these problems but i can never find a staight anser and most dts are slightly different so any advice would be much appreciated. this is my second dtr 2003 and unlike my first one this runs sweet as a nut but when come to open her up there is no powerband seems to have all...

gasto · gasto

I bought a dt200r engine which i am planing to put on my tdr after rebuiting it.I going to use the tdr wiring loom and the cdi.Comparing the engines i see that the flywheel advance stamp is differnet between the 2 engines.The stator and the pickup on the other side is identically the same ,even have the sa...

dt125lee · dt125lee

hello there i have a dt125 1998 and the bike was in bits when i bought it and now im retraceing the steps of how to build it ive had the bike up and running but puttin the petrol stright into the carb, and also with the heater pipe on and its return and the main petrol feed however there still seem to be vaccu...

DTRJoeW · DTRJoeW

Quick question, dont moan lads. Anyway, i wanna know if my powervalve is set up properly, like is it working properly? as i have no idea how to do it :/ my mates got a 06 dt x with a full dep system and i have a 2000 dtr with bigone expanny and a dep end can and air intake funnel taken off under the seat, when we was...

Dingle001 · Dingle001

Anyone had experience of the Athena pattern gasket sets? Particularly whether the head gasket blows or not.

azbo b29 · azbo b29

no compression ive either done the rings or the piston really cnt be arsed with it now just after i spent alot a money on loads of bits it goes bang typical ent it

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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
	dtr doesnt want to start (Preview) when i bought it it started after about 10 kicks and it died after about 2 minutes. i stripped the bike and rebuilt it, havent touched the engine except from cleaning the carb, new gearbox oil and 2 stroke oil. ive got a spark and petrol is going through but it just doesnt want to start. also when i push the...	mr karnage	12	184	Dec 8, 2011 by mr karnage
	Air filter (Preview) i was looking to get a K&n style filter to replace my standerd one as some idoit has drilled holes into it would it be better with the K&n style one or would it go beter standerd ?	1990dtr (aka THIEF)	9	143	Dec 8, 2011 by Energized
	Few issues with my DTR.... (Preview) on way to work this morning at 7.15am, dark, wet and windy! Just coming off the duel carridge way, dropped a gear and noticed that at the high end of the rev range it was spluttering badly. Then on the sliproad waiting in traffic, it conked out.... Started straight back up though. But was really strange....	Joe-2LT	1	89	Dec 8, 2011 by xGINCATx
	Clockwise or anti clockwise? (Preview) When the power valve does it cycle/clean what way should it go?	Derbyian	9	186	Dec 8, 2011 by xGINCATx
	piston kit (Preview) i was looking to replace the piston and rings in my bike and i found this kit YAMAHA DT125R STANDARD 56.4MM PISTON KIT DT125 DT 88-90 from a place called bike devils for 30 pound would this last does any one know if it would be any good ?	1990dtr (aka THIEF)	4	108	Dec 7, 2011 by tripr
	Transmission oil?? (Preview) Gonna replace all the oils and coolant before I start riding the dt properly but I need to ask for some advice regardin transmission oil.. In the manual it says I need sae1030 oil but after reading old transmission posts the only ones I can see recommended is 10-40 oil, silkolene?? Can you use 1040 or sho...	Reef	18	275	Dec 7, 2011 by tripr
	kick start not gripping (Preview) Hello again got an 05 re and the kick start only kicks when the bike is leant to the right I have re seated this a few times but if I try while bike is up as normal my foot goes straight down.....any ideas	romeopat	1	78	Dec 6, 2011 by ToySoldier
	Time to get a new chain and sprockets (Preview) okay so its time to get a new chain and sprockets ... i have never changed a chain or sprockets before. so... what are the sizes of the chain and sprockets that i should get ? i want an o-ring chain and i've checked with yamaha but they only had normal chains for normal prices.. so i've been searching Ebay fo...	DTPOWER	15	487	Dec 4, 2011 by ToySoldier
	Stiff bits (Preview) Hey chaps, not been on here for a while after blowing the engine, losing interest and locking the dt in the shed for 5 months. Last week I got the enthusiasm back again, ordered all the parts and started stripping. Managed to get it all apart and back together again without to much hassle but now its all ba...	kevin	8	149	Dec 2, 2011 by kevin
	carb setting ? (Preview) does any one know the carb setting for 1990 dtr	1990dtr (aka THIEF)	1	108	Dec 2, 2011 by xGINCATx
	Rough Noise When kicking the Bike Over??? (Preview) hi there i hear a Rough Noise When kicking the Bike Over as the bike dosent run properly yet i dont know if it still makes the noise when warm, the nosie sounds as if there is no oil in the crank but there is its a dry sound any help thanks :D	dt125lee	4	112	Dec 2, 2011 by dt125lee
	Piston ring or rings ??? (Preview) this seems a ovi question but new too all this the other day i took the power valve out of my bike to clean looking futher in i could see the piston and it looked like it only had one piston ring top one ? bottom missing the bike starts and rides bogs at low revs slow untill his 7 and a half ????	1990dtr (aka THIEF)	5	116	Dec 1, 2011 by Dufferz
	Engine seized, options? (Preview) alright guys, my bikes being a **** n the engines seized whilst I was trying to kick it over. Just looking for people's thoughts on my options, rebuild, new engine or bigger engine. any advice appreciated	DangerousDave87	7	172	Dec 1, 2011 by azbo b29
	Water pump seal (Preview) I've got slightly milky oil in the gear box so going to change the water pump seal. Anything to be extra carefull of? Sounds like a pretty straight forward job? Any pointers will be appreciated	Derbyian	4	135	Dec 1, 2011 by romeopat
	Dt just rebuilt Starts and dies Help Please (Preview) Hello there iv e got a 1998 dt125 and had to rebuild it from scratch anyway it starts up and runs for about 5 seconds and then bogs out, i have blown the jets out when i cleaned the carb shall i check the float in the car, and is there a idle screw on these Dt's many thanks :')	dt125lee	19	256	Nov 29, 2011 by mr karnage
	Removing snapped off oil drain bolt.... (Preview) Any thoughts? Was just torquing it up... felt like it had plenty more to go and it snapped. bastard thing! ****ty bolt! its right inside, and i cant see a way to get it out..	Dufferz	7	125	Nov 29, 2011 by xGINCATx
	Bike not starting nicely again! (Preview) Hey again guys... Having some serious issues with my bike again.. Symptoms: Not starting with no choke, with choke it starts, revs to about 5000rpm (by itself) then sounds like it floods out and dies. Tried: Top-end rebuild +2.00 (PV ground to suit), both crank seals, Carb mixture screw, jet needle p...	Dufferz	4	111	Nov 27, 2011 by Dufferz
	Speedo still not working? (Preview) Speedo cable snapped, stripped the drive on the front wheel.... Full of mud and crap.... Cleaned it all out and put fresh grease in then fitted a new cable but it still don't work? Any info? Cheers	Derbyian	0	64	Nov 26, 2011 by Derbyian
	2003 dt125 7000rpm??? (Preview) hi all.... new to the forum and could do with a little help just purchased a 2003 dt and wont rev past 7000 -7500rpm under load? but when free revving it wil reach 11000rpm ish. stripped and cleaned the power valve...set it up to the spec on the link. taken the reed switch out and put it out the way, engine nu...	Derbyian	6	135	Nov 26, 2011 by NEV
	powerband wont come on ( 1 2 ) (Preview) i know there are limitless post about these problems but i can never find a staight anser and most dts are slightly different so any advice would be much appreciated. this is my second dtr 2003 and unlike my first one this runs sweet as a nut but when come to open her up there is no powerband seems to have all...	dtr200691	33	489	Nov 26, 2011 by dtr200691
	Flywheel query (Preview) I bought a dt200r engine which i am planing to put on my tdr after rebuiting it.I going to use the tdr wiring loom and the cdi.Comparing the engines i see that the flywheel advance stamp is differnet between the 2 engines.The stator and the pickup on the other side is identically the same ,even have the sa...	gasto	6	172	Nov 24, 2011 by gasto
	Carb Hoses and pipes were they go help please (Preview) hello there i have a dt125 1998 and the bike was in bits when i bought it and now im retraceing the steps of how to build it ive had the bike up and running but puttin the petrol stright into the carb, and also with the heater pipe on and its return and the main petrol feed however there still seem to be vaccu...	dt125lee	3	142	Nov 24, 2011 by dt125lee
	How to tell if the YPVS is open properly? (Preview) Quick question, dont moan lads. Anyway, i wanna know if my powervalve is set up properly, like is it working properly? as i have no idea how to do it :/ my mates got a 06 dt x with a full dep system and i have a 2000 dtr with bigone expanny and a dep end can and air intake funnel taken off under the seat, when we was...	DTRJoeW	0	113	Nov 24, 2011 by DTRJoeW
	Athena Gasket sets (Preview) Anyone had experience of the Athena pattern gasket sets? Particularly whether the head gasket blows or not.	Dingle001	3	273	Nov 23, 2011 by Dufferz
	dts gone bang (Preview) no compression ive either done the rings or the piston really cnt be arsed with it now just after i spent alot a money on loads of bits it goes bang typical ent it	azbo b29	2	117	Nov 22, 2011 by 220 tubz
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