DT125R ARCHIVE

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

was advised to do a plug chop when rebuilding my top end can any one tell me what this is means and advantages cheers

DTRUS · DTRUS

hi all not been on here for a whle. i have a yamaha dt125r 1999 i started the bike a few weeks back and there was a rattling sound from the engine. turned out top piece of the piston had broke of and most of a ring. some of the cylinder had got a little scraped i used a wet and dry sand paper to smooth the marks out....

fused420 · fused420

So i have finally got round to starting my engine rebuild but i'm stuck already, lol, I can't get the front sprocket off! The engine is on my front room floor so i don't have the option of putting the back brake on (live n learn!), so I've got a big pair of grips to hold the sprocket and a breaker bar, but its n...

bobo · bobo

i keep topping up my gearbox oil and the next day its back at the bottom of the sight glass no visible oil leaks,engines only done 4,000 miles any ideas anyone.

PatMan · PatMan

Hello treacles picked my cylinder head and barrel up yesterday with all new piston etc etc, the bore is now a plus 2mm so a 58mm, I now have to dermal/grind the powervalve down 2mm aswell? As of course with the powervalve shut the piston will now go up and down in the barrel, (I just tested all this before I p...

Reef · Reef

Cant really explain what its called but its located close to the fuses on the right hand side of the RE (might not apply to dtr's but see pic below) lol anyway when i was trying to get my bike to start the other day with my mate (knows a bit about bikes) he noticed this block with 2 pipes coming out of the bottom...

PatMan · PatMan

Hello Lads I want to take my oil pump screws out to make sure the oil pump is ok and NOT faulty before I put all my new top end back together, but when Yamaha put the screws back in they have used a lock glue type thing and one of them will not come out the bloody thing, its so tight its unreal, and of course dont wa...

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

iv fitted a new engine to my dtr 125 the problem is i get about half hour ride each time full power lovely then it all of a sudden gets slugish reli bad then dies and will not start ! iv checked everything carb i have a spark ect then i change the spark plug and it work fine for the same amount of time now its done i...

NorthEast · NorthEast

http://www.piaggiospares.co.uk/spares/epc2.asp?PageiD=20&modelID=9136&m=YAMAHA+DT125R+++1990+OIL+TANK&uID=0

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

took off my flywhell to get to my stator today when i put it back on its consantly clicking all kind of nosies any idea ?????

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

well tomorrow i was planning on swaping the ehine from my 1990 dt for the same engine but 03 with just over 5000 miles !! im under the impression that i can chuck it in and it will work run etc as the looms 88-03 are the same is this correct as the last thing i want to do is take my current one the 1990 out and the 03...

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

does any one know if a IGNITION PICK UP from a 2003 wrk on a 1990 just the pick up / pulser

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

does any one know if the thing that picks the spark up off the flywheel be the same in all dt engine or are they diffrent unsure as im fitted a 03 engine and removing the 1990 i know i have to change the stator but is the pick up soilnoid the same

stroker · stroker

Hey guys had to strip my engine down due to play in the crank All is going well, found the bottum rings are seized in flush within the piston but the barral looks to be ok and there is no pick up markd on the old piston so all gd there Now have any of you got any tips on removing the clutch hub without the proper to...

NORFE · NORFE

whats the smallest rear sprocket any ones managed to fit as lookin at the rear hub it looks pretty big ?????

tripr · Status: Online

i think my small end bearing disintergrated on the way home i was takin it easy on the new rebore an everything so i need one of them now too my piston well the damage thats gone on is wierd ill whack up a pic if anybody has any advice on what went wrong id appreciate it triprGuru Status: OnlineP...

NorthEast · NorthEast

http://imageshack.us/photo/my-images/442/carbb.jpg/-- Edited by NorthEast on Thursday 5th of January...

Energized · Energized

Hey guys my first problem has arisen, so to speak, with the DT. Well i went out for a spin today, stopped off at the shop, got some supplies and went to turn the ignition on and the pv cycle sounded as normal then afterwards went a bit mental and sounded like a coffee grinder. I thought nothing of it and road o...

Grantypanty · Grantypanty

I got a flat sided carb mikuni & the float's bent. found on on the net for a tzr125 but it looks exactly like mine.. & it did say dt125.. but not sure to take the chance.

Grantypanty · Grantypanty

My carb looks the exact same as the one i'm buying,it's a flat side carb 2kr upgrade & it's for a tzr125 but also says that it could be used for a dt... Dooes anyone think i should get it? as i was gonna get another offroad.. help D:!!!!

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

hi i owe a 1990 dtr and i am picking another engine up a yamaha dtr dt 125 dt125 03 3RM 4BL Y-1 will this go stright in should the magneto wire be the same ect ?

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

having a bit of trouble with my carb cant get it to idle and it drops and revs all over the place and wen its reved i allmost cuts out well i though air screw idle screw but no i think the float hight could be wrong does any one know the setting also i found the needle was to high so moved it back to its standerd pos...

NorDt · NorDt

Hey, Im from norway so please excuse my english if its bad, I bough a 170cc cyllinder kit from athena just before the winter set in this year, But i cant get it to run cleanly, Im so upset, since i was expecting a big change, But actually, Its slower than it used to, This is my set up Athena 170cc, Mikuni tm 3...

NORFE · NORFE

well just so happens that santa bought my mate a new dyno machine for xmas..... I'v just been speaking to him and hes got him self a unit in knottingley and in the process of setting up shop ! he races 4 strokes and bought it for his own use really for setting up his bike but said he'd be happy to offer me and who...

NORFE · NORFE

http://www.ebay.co.uk/itm/DERBI-GPR125-2005-GPR-POWER-VALVE-SERVO-/220921191388?pt=UK_Motorcycle_Parts&hash=item336feddbdc#ht_568wt_1037

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Topic		Started By	Replies	Views	Last Post
	plug chop ? (Preview) was advised to do a plug chop when rebuilding my top end can any one tell me what this is means and advantages cheers	1990dtr (aka THIEF)	9	153	Jan 17, 2012 by stroker
	running problem after new piston/rings (Preview) hi all not been on here for a whle. i have a yamaha dt125r 1999 i started the bike a few weeks back and there was a rattling sound from the engine. turned out top piece of the piston had broke of and most of a ring. some of the cylinder had got a little scraped i used a wet and dry sand paper to smooth the marks out....	DTRUS	12	200	Jan 17, 2012 by NORFE
	Front Sprocket Removal (Preview) So i have finally got round to starting my engine rebuild but i'm stuck already, lol, I can't get the front sprocket off! The engine is on my front room floor so i don't have the option of putting the back brake on (live n learn!), so I've got a big pair of grips to hold the sprocket and a breaker bar, but its n...	fused420	15	207	Jan 16, 2012 by NEV
	using gearbox oil (Preview) i keep topping up my gearbox oil and the next day its back at the bottom of the sight glass no visible oil leaks,engines only done 4,000 miles any ideas anyone.	bobo	9	253	Jan 16, 2012 by NORFE
	Rebore sorted but need some advice!!!!! (Preview) Hello treacles picked my cylinder head and barrel up yesterday with all new piston etc etc, the bore is now a plus 2mm so a 58mm, I now have to dermal/grind the powervalve down 2mm aswell? As of course with the powervalve shut the piston will now go up and down in the barrel, (I just tested all this before I p...	PatMan	24	266	Jan 16, 2012 by NORFE
	C02 emissions block?? (Preview) Cant really explain what its called but its located close to the fuses on the right hand side of the RE (might not apply to dtr's but see pic below) lol anyway when i was trying to get my bike to start the other day with my mate (knows a bit about bikes) he noticed this block with 2 pipes coming out of the bottom...	Reef	13	184	Jan 16, 2012 by Reef
	Oil pump screws (Preview) Hello Lads I want to take my oil pump screws out to make sure the oil pump is ok and NOT faulty before I put all my new top end back together, but when Yamaha put the screws back in they have used a lock glue type thing and one of them will not come out the bloody thing, its so tight its unreal, and of course dont wa...	PatMan	4	122	Jan 16, 2012 by PatMan
	big help someone please !!! (Preview) iv fitted a new engine to my dtr 125 the problem is i get about half hour ride each time full power lovely then it all of a sudden gets slugish reli bad then dies and will not start ! iv checked everything carb i have a spark ect then i change the spark plug and it work fine for the same amount of time now its done i...	1990dtr (aka THIEF)	10	146	Jan 15, 2012 by NORFE
	Tank Recovery (Preview) http://www.piaggiospares.co.uk/spares/epc2.asp?PageiD=20&modelID=9136&m=YAMAHA+DT125R+++1990+OIL+TANK&uID=0	NorthEast	10	163	Jan 13, 2012 by NEV
	flywheel help (Preview) took off my flywhell to get to my stator today when i put it back on its consantly clicking all kind of nosies any idea ?????	1990dtr (aka THIEF)	7	130	Jan 12, 2012 by NORFE
	NEED SOME HELP ! ( 1 2 ) (Preview) well tomorrow i was planning on swaping the ehine from my 1990 dt for the same engine but 03 with just over 5000 miles !! im under the impression that i can chuck it in and it will work run etc as the looms 88-03 are the same is this correct as the last thing i want to do is take my current one the 1990 out and the 03...	1990dtr (aka THIEF)	42	309	Jan 11, 2012 by 1990dtr (aka THIEF)
	IGNITION PICK UP ! (Preview) does any one know if a IGNITION PICK UP from a 2003 wrk on a 1990 just the pick up / pulser	1990dtr (aka THIEF)	0	100	Jan 11, 2012 by 1990dtr (aka THIEF)
	spark pick solenoid up bracket (Preview) does any one know if the thing that picks the spark up off the flywheel be the same in all dt engine or are they diffrent unsure as im fitted a 03 engine and removing the 1990 i know i have to change the stator but is the pick up soilnoid the same	1990dtr (aka THIEF)	0	83	Jan 11, 2012 by 1990dtr (aka THIEF)
	Clutch hub removal?? (Preview) Hey guys had to strip my engine down due to play in the crank All is going well, found the bottum rings are seized in flush within the piston but the barral looks to be ok and there is no pick up markd on the old piston so all gd there Now have any of you got any tips on removing the clutch hub without the proper to...	stroker	12	193	Jan 9, 2012 by stroker
	rear sprocket (Preview) whats the smallest rear sprocket any ones managed to fit as lookin at the rear hub it looks pretty big ?????	NORFE	2	116	Jan 7, 2012 by NORFE
	strange piston damage help (Preview) i think my small end bearing disintergrated on the way home i was takin it easy on the new rebore an everything so i need one of them now too my piston well the damage thats gone on is wierd ill whack up a pic if anybody has any advice on what went wrong id appreciate it triprGuru Status: OnlineP...	tripr	19	237	Jan 7, 2012 by NORFE
	mikuni flatslide carb parts (Preview) http://imageshack.us/photo/my-images/442/carbb.jpg/-- Edited by NorthEast on Thursday 5th of January...	NorthEast	5	136	Jan 6, 2012 by NorthEast
	Powervalve Help (: (Preview) Hey guys my first problem has arisen, so to speak, with the DT. Well i went out for a spin today, stopped off at the shop, got some supplies and went to turn the ignition on and the pv cycle sounded as normal then afterwards went a bit mental and sounded like a coffee grinder. I thought nothing of it and road o...	Energized	2	139	Jan 5, 2012 by Energized
	Need help comparing carbs!! Buying one but not sure if it's ok help! (Preview) I got a flat sided carb mikuni & the float's bent. found on on the net for a tzr125 but it looks exactly like mine.. & it did say dt125.. but not sure to take the chance.	Grantypanty	1	100	Jan 4, 2012 by tripr
	Need help with comparing this carb with mine!!! (Preview) My carb looks the exact same as the one i'm buying,it's a flat side carb 2kr upgrade & it's for a tzr125 but also says that it could be used for a dt... Dooes anyone think i should get it? as i was gonna get another offroad.. help D:!!!!	Grantypanty	0	92	Jan 4, 2012 by Grantypanty
	yamaha dtr dt 125 engine (Preview) *hi i owe a 1990 dtr and i am picking another engine up a* *yamaha dtr dt 125 dt125 03 3RM 4BL Y-1 will this go stright in should the magneto wire be the same ect ?*	1990dtr (aka THIEF)	2	114	Jan 4, 2012 by 1990dtr (aka THIEF)
	28mm flatside carb (Preview) having a bit of trouble with my carb cant get it to idle and it drops and revs all over the place and wen its reved i allmost cuts out well i though air screw idle screw but no i think the float hight could be wrong does any one know the setting also i found the needle was to high so moved it back to its standerd pos...	1990dtr (aka THIEF)	2	122	Jan 3, 2012 by 1990dtr (aka THIEF)
	Athena 170cc kit, Help?? ( 1 2 ) (Preview) Hey, Im from norway so please excuse my english if its bad, I bough a 170cc cyllinder kit from athena just before the winter set in this year, But i cant get it to run cleanly, Im so upset, since i was expecting a big change, But actually, Its slower than it used to, This is my set up Athena 170cc, Mikuni tm 3...	NorDt	54	670	Jan 3, 2012 by miguelNS
	cheep dyno day (Preview) well just so happens that santa bought my mate a new dyno machine for xmas..... I'v just been speaking to him and hes got him self a unit in knottingley and in the process of setting up shop ! he races 4 strokes and bought it for his own use really for setting up his bike but said he'd be happy to offer me and who...	NORFE	4	113	Jan 2, 2012 by Nathlaad
	CHEEP SERVO (Preview) http://www.ebay.co.uk/itm/DERBI-GPR125-2005-GPR-POWER-VALVE-SERVO-/220921191388?pt=UK_Motorcycle_Parts&hash=item336feddbdc#ht_568wt_1037	NORFE	0	97	Jan 1, 2012 by NORFE
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