DT125R ARCHIVE

gooner78 · gooner78

I took my bike out for a gentle run after work as the engines just been fully rebuilt and I wanted to to start running it in but I only done 2 miles when I noticed the temp guage was three quarters of the way up so I returned home. I was wondering if this is normal when you first start running an engine as I have on...

benjarminx · benjarminx

hi guys the other day my bike was reving to max revs on startup, first thing i thought was airleak, checked the manifold, huge tear! bought a new manifold installed it properly with gasket maker/sealent and went to start it and the same bloody thing is happening! i sprayed wd40 everywhere manifold, p...

dread123 · dread123

anyone experience this? had tiny very tiny water leak ontop of head- thought it was a leak or gasket had gone. on closer inspection there were tiny droplets leaking from where the 3bn stamp was? took the head off and confirmed a half inch crack along bottom of writing?? anyone experienced this? not sur...

wheelie boy · wheelie boy

my dt125 is leaking water from sparkplug not much tho not loosing power or awt and on hi revs sounds like its chokeing then afta a few mins its ok i can nail it

slob · slob

My pain continues guys, hopefully you can get some sort of idea whats wrong from the videos. Is it an airleak? Or is it the engine drawing in all the petrol it can for some reason. Thanks in advance guys, good to be back btw, missed the forum just been so busy and the bike just did my DT morale in with the hea...

Jesse_DT · Jesse_DT

So, just replaced my water pump oil seal and oil pump oil seal due to finding oil in my coolant. Also seem to have another problem, the bike isn't smoking very much and after taking it for a 3/4 mile test ride, smoked white quite a bit. could this be steam? The bike also won't rev cleanly through the rev rang...

Dt Danny · Dt Danny

would removing the water expansion tank off effect the cooling system ?

otty · otty

Hello, So I did my top-end rebuild with Athena 170cc kit. All gaskets new etc... Today I ran it and it started leaking somekind of iron-coloured fuel-like-smelling liquid from exhaust from the cylinder. Also the spark plug was covered with it. I was wondering if it could be some coolant that went into...

zander · zander

So now it bogged for real... need a full topend rebuild, yay It's good because I dont have any summerjob, so now I can waste time on the DT :) bad thing is, now it's gonna cost -.- my guess why it bogged is either because I recently started using another 2t oil and didn't drain the oil system OR it is cause it he...

Dt Danny · Dt Danny

i did the head gasket in college and this one is the one that came off only 3 months old i think and its anthena -- Edited by Danny0112 on Tuesday 21st of May 2013 03:22:50 PM

zander · zander

So I changed the cylinder head gasket at my brother buut, I were too lazy to fill up the cooler, because I thought I've been running without water in the cooler all the time for the past half year since the gasket was leaking... without problem... anyways, so the heat lamp started glowing and it used to do...

zander · zander

I think my top end gasket is broke since my coolant level always drops, and if I dont fill it up, it overheats quite easy... soo, I ordered home a new top end gasket, but it's been like this since I changed the gasket and I've been to lazy to do smthing about it... until I read about someone else with this prob...

Dt Danny · Dt Danny

well my dt has been slowly loosing coolent so i took it into the workshop in college and put a pressure tester on the cooling system and then i started my engine and the pressure slowly went up :/ but this time im doing it in college with the tutors to help me so i shouldnt get it wrong

stillbroke · stillbroke

as above the engine is freshly rebuilt and im running pre mix just cant work this one out as it was running fine (yesterday my first outing) then aroun5 5 yesterday it started playing up and now just will not idle off choke if i throttle it its fine but im having to wrestle with it gotta make mayday run any he...

Rastazak · Rastazak

Hey there, I have just recently removed my barrel and head to replace the base gasket on my 2003 dtr. The cylinder and piston etc are from the athena 170 kit. On inspection i have noticed the piston has some small scratches on the reed valve side. It appears that the reed valve petals or block have been s...

Boxing · Boxing

Hi all. I have a 1997 DT, today is my 17th birthday so I've only just got it road legal. Took it out thinking it'd be quicker than my ped, and it won't go past 40. And it won't rev past 6-7K RPMs. I've looked at the powervalve, its open fully and working. It's got a full DEP exhaust, and still a rev limiter. But i...

Rastazak · Rastazak

Can a mod delete this please? it wont seem to let me do it. An updated version of this thread has been re-posted with pics. Thanks -- Edited by Rastazak on Tuesday 23rd of April 2013 09:49:39 AM

stillbroke · stillbroke

really need a temp sensor urgently but cant be paying the price asked for them any ideas if there is another that will fit ?

slob · slob

As in the title guys, it is cyclying nicely and sparking but it won't start. I took the spark plug out and it was dry as a bone so obviously no fuel is getting in somehow, any ideas?

MDK · MDK

Whats your thoughts on the sound of the engine its the TZR by the way lol ... bear in mind no power valve fitted and after marked k/n style air filter

Dt Danny · Dt Danny

Right here is my situation if you havent read my last topic, my bike blew up and ive took it apart and found fragments of the piston in the crank case when i came to clean the fragments out, the crank out before it was stuck maybe because it was left over night with no head on ? or something else serious. so im s...

stillbroke · stillbroke

as above this is the 3rd top end build im having to do getting really pissed off with it now .i dont know if having the powervalve flush with the port could be causing the pistons to keep mashing up what could be the problem

CarlosRexx · CarlosRexx

So, on both my bikes now the thermostat has failed and caused the bike to run unusually hot. The pin that guides the inside comes out and gets stuck so the thermosat either cant open or gets jammed. It's pissing me off. I've just had the rebuild done and put in the bike but didn't wanna run it without a therm...

tunertom · tunertom

hey, my bike overheated today and cut out on me, it didnt seize luckily. what is the correct amount of water to put into the radiator and how do i go about it? is it right to fill it ALL the way to the top? as i filled it all the way to the top when it overheated, this is the first time i changed the fluid in the b...

benjarminx · benjarminx

Hi guys i bought a project dt and it had a few parts missing tomorow im going to see/buy a 1992 dt125 i was wondering would the 1992 powervalve be compatable with a 52 dt125? also i know its kinda of the wrong section but also would the 92 carb be fine on the 52 dt125? regards ben

Sub Forum	Topics	Posts	Last Post
CYLINDERS - Read Only Anything Cylinder related	73	1040	Jan 18, 2016 by the only way is YAMAHA DTR
CARBS - Read Only Anything Carb related	90	907	Sep 14, 2016 by Calum122
POWERVALVES - Read Only Anything Powervalve related	49	500	Apr 14, 2016 by The Bandit
AIR FILTER - Read Only Anything Filter related	10	85	Sep 20, 2015 by dan28
JETTING - Read Only Anything Jetting related	12	78	Nov 6, 2014 by scrimsmustang
PISTONS - Read Only Anything Piston related	29	698	Jan 7, 2015 by tomimsmith1992

Topic		Started By	Replies	Views	Last Post
	Bike Running Hot After Full Rebuild (Preview) I took my bike out for a gentle run after work as the engines just been fully rebuilt and I wanted to to start running it in but I only done 2 miles when I noticed the temp guage was three quarters of the way up so I returned home. I was wondering if this is normal when you first start running an engine as I have on...	gooner78	23	364	Aug 2, 2013 by gooner78
	Well pissed off! Any input help!!! (Preview) hi guys the other day my bike was reving to max revs on startup, first thing i thought was airleak, checked the manifold, huge tear! bought a new manifold installed it properly with gasket maker/sealent and went to start it and the same bloody thing is happening! i sprayed wd40 everywhere manifold, p...	benjarminx	8	296	Jul 26, 2013 by benjarminx
	cylinder head cracked? (Preview) anyone experience this? had tiny very tiny water leak ontop of head- thought it was a leak or gasket had gone. on closer inspection there were tiny droplets leaking from where the 3bn stamp was? took the head off and confirmed a half inch crack along bottom of writing?? anyone experienced this? not sur...	dread123	0	176	Jul 23, 2013 by dread123
	leaking water (Preview) my dt125 is leaking water from sparkplug not much tho not loosing power or awt and on hi revs sounds like its chokeing then afta a few mins its ok i can nail it	wheelie boy	9	324	Jul 23, 2013 by MDK
	Bike Revving up full throttle on it's own after rebuild. ( videos inside ) (Preview) My pain continues guys, hopefully you can get some sort of idea whats wrong from the videos. Is it an airleak? Or is it the engine drawing in all the petrol it can for some reason. Thanks in advance guys, good to be back btw, missed the forum just been so busy and the bike just did my DT morale in with the hea...	slob	23	863	Jul 22, 2013 by ShaunyBoy
	Losing power (Preview) So, just replaced my water pump oil seal and oil pump oil seal due to finding oil in my coolant. Also seem to have another problem, the bike isn't smoking very much and after taking it for a 3/4 mile test ride, smoked white quite a bit. could this be steam? The bike also won't rev cleanly through the rev rang...	Jesse_DT	18	369	Jul 21, 2013 by Jesse_DT
	Expansion bottle (Preview) would removing the water expansion tank off effect the cooling system ?	Dt Danny	7	232	Jun 25, 2013 by Energized
	Weird liquid problem after top-end rebuild (Preview) Hello, So I did my top-end rebuild with Athena 170cc kit. All gaskets new etc... Today I ran it and it started leaking somekind of iron-coloured fuel-like-smelling liquid from exhaust from the cylinder. Also the spark plug was covered with it. I was wondering if it could be some coolant that went into...	otty	15	312	Jun 7, 2013 by Calum122
	Yup so the cylinder and piston are screwed (Preview) So now it bogged for real... need a full topend rebuild, yay It's good because I dont have any summerjob, so now I can waste time on the DT :) bad thing is, now it's gonna cost -.- my guess why it bogged is either because I recently started using another 2t oil and didn't drain the oil system OR it is cause it he...	zander	8	258	Jun 6, 2013 by zander
	Is this fooked or not fooked (Preview) i did the head gasket in college and this one is the one that came off only 3 months old i think and its anthena -- Edited by Danny0112 on Tuesday 21st of May 2013 03:22:50 PM	Dt Danny	6	237	May 24, 2013 by FunkeyMunkeyDavid
	Bogged from heat, should I worry? (Preview) So I changed the cylinder head gasket at my brother buut, I were too lazy to fill up the cooler, because I thought I've been running without water in the cooler all the time for the past half year since the gasket was leaking... without problem... anyways, so the heat lamp started glowing and it used to do...	zander	8	254	May 23, 2013 by Seanyftw
	Skimming the cylinder head (Preview) I think my top end gasket is broke since my coolant level always drops, and if I dont fill it up, it overheats quite easy... soo, I ordered home a new top end gasket, but it's been like this since I changed the gasket and I've been to lazy to do smthing about it... until I read about someone else with this prob...	zander	13	308	May 15, 2013 by zander
	looks like i need a new head gasket (Preview) well my dt has been slowly loosing coolent so i took it into the workshop in college and put a pressure tester on the cooling system and then i started my engine and the pressure slowly went up :/ but this time im doing it in college with the tutors to help me so i shouldnt get it wrong	Dt Danny	10	315	May 15, 2013 by Grantypanty
	bike wont run without choke on when off it revs to 4k and then dies clarification on screws please! (Preview) as above the engine is freshly rebuilt and im running pre mix just cant work this one out as it was running fine (yesterday my first outing) then aroun5 5 yesterday it started playing up and now just will not idle off choke if i throttle it its fine but im having to wrestle with it gotta make mayday run any he...	stillbroke	16	283	May 6, 2013 by Boxing
	Scratches on psiton skirt + blow-by? (Preview) Hey there, I have just recently removed my barrel and head to replace the base gasket on my 2003 dtr. The cylinder and piston etc are from the athena 170 kit. On inspection i have noticed the piston has some small scratches on the reed valve side. It appears that the reed valve petals or block have been s...	Rastazak	9	233	Apr 27, 2013 by NORFE
	DT won't go past 40MPH. :-( ( 1 2 3 4 5 … 9 ) (Preview) Hi all. I have a 1997 DT, today is my 17th birthday so I've only just got it road legal. Took it out thinking it'd be quicker than my ped, and it won't go past 40. And it won't rev past 6-7K RPMs. I've looked at the powervalve, its open fully and working. It's got a full DEP exhaust, and still a rev limiter. But i...	Boxing	256	3478	Apr 26, 2013 by Boxing
	Scratches on piston skirt + possible blow by? (Preview) Can a mod delete this please? it wont seem to let me do it. An updated version of this thread has been re-posted with pics. Thanks -- Edited by Rastazak on Tuesday 23rd of April 2013 09:49:39 AM	Rastazak	2	213	Apr 23, 2013 by Calum122
	other temerature senders that will fit the dt (Preview) really need a temp sensor urgently but cant be paying the price asked for them any ideas if there is another that will fit ?	stillbroke	2	209	Mar 23, 2013 by NEV
	Bike won't start getting no fuel. (Preview) As in the title guys, it is cyclying nicely and sparking but it won't start. I took the spark plug out and it was dry as a bone so obviously no fuel is getting in somehow, any ideas?	slob	17	281	Mar 19, 2013 by slob
	THOUGHTS ON ENGINE SOUND (Preview) Whats your thoughts on the sound of the engine its the TZR by the way lol ... bear in mind no power valve fitted and after marked k/n style air filter	MDK	2	284	Mar 17, 2013 by MDK
	guidance needed of you kind fellows ( 1 2 3 4 5 … 9 ) (Preview) Right here is my situation if you havent read my last topic, my bike blew up and ive took it apart and found fragments of the piston in the crank case when i came to clean the fragments out, the crank out before it was stuck maybe because it was left over night with no head on ? or something else serious. so im s...	Dt Danny	255	3418	Mar 17, 2013 by Dt Danny
	could my powervalve being flush with the exhaust port be causing so many rebuilds ? ( 1 2 ) (Preview) as above this is the 3rd top end build im having to do getting really pissed off with it now .i dont know if having the powervalve flush with the port could be causing the pistons to keep mashing up what could be the problem	stillbroke	54	781	Mar 7, 2013 by MDK
	Thermostat problems (Preview) So, on both my bikes now the thermostat has failed and caused the bike to run unusually hot. The pin that guides the inside comes out and gets stuck so the thermosat either cant open or gets jammed. It's pissing me off. I've just had the rebuild done and put in the bike but didn't wanna run it without a therm...	CarlosRexx	3	231	Feb 13, 2013 by NORFE
	Overheating? is this right? (Preview) hey, my bike overheated today and cut out on me, it didnt seize luckily. what is the correct amount of water to put into the radiator and how do i go about it? is it right to fill it ALL the way to the top? as i filled it all the way to the top when it overheated, this is the first time i changed the fluid in the b...	tunertom	20	354	Feb 3, 2013 by Seanyftw
	Dt125 power valve Compatibility? (Preview) Hi guys i bought a project dt and it had a few parts missing tomorow im going to see/buy a 1992 dt125 i was wondering would the 1992 powervalve be compatable with a 52 dt125? also i know its kinda of the wrong section but also would the 92 carb be fine on the 52 dt125? regards ben	benjarminx	1	176	Feb 3, 2013 by Calum122
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