DT125R ARCHIVE

superted · superted

hi guys im new to the forum and i have just bought a 2002 dt125r, i just rebuilt the top end as done a 1mm rebore 1mm o/s proxy piston kit, riken rings, little end and top end gasket set. took it out and noticed water trail behind me. been looking and cant see where it comming from, only thing i can see is its on...

NorDt · NorDt

ok so im gonna use the standard barrel untill i get a new powervalve for the 170cc. But the rings on my standard barrel was worn, so i bought some new today. But there is a third ring, Wich i think is called a oil ring or something. I think it goes beneath the bottom piston ring. but im not 100% shure. . ...

CarlosRexx · CarlosRexx

So after trawling the Internet for a 3MB00 head, I put my engine out and notice that my cylinder is already the one I want. That'll teach me for not looking properly. As some of you know it was stolen last weekend sometime as so I've pulled it all apart to do some maintenance before getting it back on the r...

WoZz · WoZz

- -- Edited by WoZz on Friday 12th of July 2013 01:43:11 PM

Harry · Harry

[IMG]https://i886.photobucket.com/albums/ac65/Kona_206/Y57%20XAX%20-%202001%20DT%20R%20125/IMG_2740.jpg[/IM...

DTRJoeW · DTRJoeW

Hey guys Wasnt sure if this was the correct place to post this, but im sure someone could move it or what Anyway, got a 2000 dtr125, ive had like 3 head gasket changes on it since owning it, and every ride i have to top it up with water, it drips slowly and today my coolant bottle cap blew off(expansion) head...

DTRJoeW · DTRJoeW

After rebuilding the dt once again due to a piston going messy on me, which i upload a picture tomorrow, I rebuilt it, using ****ty aftermarket gasket and when lubing the piston up, I didn't use 2 stroke as I was to lazy to get off my ass, I used 4 stroke lawn mower oil which had been sat outside for a bit witho...

Barron89 · Barron89

Does anyone know what the compression rating is for a 3bn head. As I'm going to use a tester tonight. If the compression is about correct does that mean that there shouldn't be a problem in the top end causing a severe lack of power? Or do other factors come into this? Any advice is greatly appreciated!...

CarlosRexx · CarlosRexx

Gold like covering on the bore/cylinder insides and the inside of the crankcasing?

CarlosRexx · CarlosRexx

Ive recently rebuilt my top end and after starting it this morning I have a rattle? Or a metal knocking? It's bizarre as I put everything back as it came out albeit replacing gaskets, piston rings and bearing

DTCrazedKid · DTCrazedKid

So, I've got a YZ 125 engine, and wanna know if the YZ head will fit onto a spare DT 125 engine (with no cylinder) I don't want the bottom end of the YZ one, so if anyone wants, they can buy it from me for cheap without the head.. unless head wont fit to the DT, then i'll jus shift the whole engine.. EDIT: I would...

DTR_NW · DTR_NW

so just bought a standard 1998 dtr can sumone let me know what size the standard piston is what the next size up is (also what size will i have to bore it out) and how much is it ruffly to have it bored and new piston put in thanks in advance guys

gooner78 · gooner78

Just a quick question on the bottom of my cylinder just below the exhaust there is long narrow hole but the base gasket i have will block half of this off its a 3MB00 cylinder will i need to modify the gasket thanks:confuse

NorDt · NorDt

Hey, has anyone here done this before ? And do you know what a safe amount of lowering / skimming would be ?.. If no one knows im gonna measure the squish myself.

NORFE · NORFE

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?VISuperSize&item=290718962241...

DTCrazedKid · DTCrazedKid

yeah so, i've come to the decision that i wanna drill/dremmel out my barrel but idk where to start on doing this, anyone got tips/images/tutorial on what to do with it to make it perfect? i dont wanna start grinding it down till i know exactly wehre to start etc. cheers now

zander · zander

Hi I recently got myself a Yamaha DT 125 RE -06. The piston has ran about 18 000km so I'm about to change piston. My problem is that it's really tight and narrow where the cylinder screws are, and I can't reach them all with my tools. I believe you're able to change piston on these bikes without removing the...

NorDt · NorDt

Hey, I once seized my cyllinder because it had a too small jet, and i pushed the engine too hard for a long time with a passanger. (Worst case scenario ??) But my question is, If the engine has a too small jet. The engine will still be very hot before it seizes right ?. I have no temperature gauge, But if i di...

Ralzy · Ralzy

Not sure if this topic should be here or in the carb section. Sorry in advance admin. Hi lads Anyone know the M size of the Banjo Bolts that holds the carb warmer pipes to the cylinder head? Thanks -- Edited by Ralzy on Wednesday 18th of April 2012 09:15:50 AM

hairdoo · hairdoo

Heard so many stories of ppl buyin wrong/cheap gaskets that i'd post pics of the genuine yamaha gaskets i got during my top end overhaul n rebore

eG x LoGiKzZ · eG x LoGiKzZ

The piston in my tdr is knocking around, too small or rings too small? dont know havent had a good look yet, piston has 050 on the top so i assume its been rebored twice, can it be bored out again?

gooner78 · gooner78

as title says its noticable on start up and when the bikes cold but once its warmed up its not as bad but you can still hear it. Do you think it could be due a rebore last one was 10000 miles ago the thing is it sarts first time every time and still pulls well i can still get 75mph + out of it

NorDt · NorDt

Okay, i asked this before but im still not quiet shure. Theres alot of you guys here that has some older dts. like 90-2000. Im wondering if this bikes has the same barrel as my dt re 04 ?. a 3MB or something like that. And does also the newer dtx have this barrel ?. If there are different barrel on the differ...

jakeDT125 · jakeDT125

does anyone know how to swap out the standard front box cylinder to a external cylinder one like the rear?

gooner78 · gooner78

As title says my rear brake won,t pressurise i,ve bled the system so i know its not that i have really pump the brake pedal to make the piston move a tiny bit at a time and when it reaches the pads it has no power to push on them just wanted to now if i,m in the right area in my potential diagnosis thanks

Topic		Started By	Replies	Views	Last Post
	coolent on my swingging arm (Preview) hi guys im new to the forum and i have just bought a 2002 dt125r, i just rebuilt the top end as done a 1mm rebore 1mm o/s proxy piston kit, riken rings, little end and top end gasket set. took it out and noticed water trail behind me. been looking and cant see where it comming from, only thing i can see is its on...	superted	16	263	Oct 2, 2012 by NEV
	Got a new ring set for the standard piston. Weird third ring ? ( 1 2 ) (Preview) ok so im gonna use the standard barrel untill i get a new powervalve for the 170cc. But the rings on my standard barrel was worn, so i bought some new today. But there is a third ring, Wich i think is called a oil ring or something. I think it goes beneath the bottom piston ring. but im not 100% shure. . ...	NorDt	44	595	Sep 11, 2012 by NorDt
	3MB00 after being stolen (Preview) So after trawling the Internet for a 3MB00 head, I put my engine out and notice that my cylinder is already the one I want. That'll teach me for not looking properly. As some of you know it was stolen last weekend sometime as so I've pulled it all apart to do some maintenance before getting it back on the r...	CarlosRexx	17	271	Sep 10, 2012 by AndyYam
	2.5mm Over Standard Rebore ? (Preview) - -- Edited by WoZz on Friday 12th of July 2013 01:43:11 PM	WoZz	5	381	Sep 6, 2012 by NORFE
	What shall I do? ( 1 2 3 ) (Preview) [IMG]https://i886.photobucket.com/albums/ac65/Kona_206/Y57%20XAX%20-%202001%20DT%20R%20125/IMG_2740.jpg[/IM...	Harry	69	889	Sep 2, 2012 by Harry
	Coolant leaking (Preview) Hey guys Wasnt sure if this was the correct place to post this, but im sure someone could move it or what Anyway, got a 2000 dtr125, ive had like 3 head gasket changes on it since owning it, and every ride i have to top it up with water, it drips slowly and today my coolant bottle cap blew off(expansion) head...	DTRJoeW	11	206	Aug 23, 2012 by AndyYam
	Smokey since rebuild (Preview) After rebuilding the dt once again due to a piston going messy on me, which i upload a picture tomorrow, I rebuilt it, using ****ty aftermarket gasket and when lubing the piston up, I didn't use 2 stroke as I was to lazy to get off my ass, I used 4 stroke lawn mower oil which had been sat outside for a bit witho...	DTRJoeW	4	161	Aug 23, 2012 by AndyYam
	Compression question (Preview) Does anyone know what the compression rating is for a 3bn head. As I'm going to use a tester tonight. If the compression is about correct does that mean that there shouldn't be a problem in the top end causing a severe lack of power? Or do other factors come into this? Any advice is greatly appreciated!...	Barron89	3	164	Aug 21, 2012 by AndyYam
	Whats the.. (Preview) Gold like covering on the bore/cylinder insides and the inside of the crankcasing?	CarlosRexx	6	209	Aug 16, 2012 by FunkeyMunkeyDavid
	Recent rebuild (Preview) Ive recently rebuilt my top end and after starting it this morning I have a rattle? Or a metal knocking? It's bizarre as I put everything back as it came out albeit replacing gaskets, piston rings and bearing	CarlosRexx	14	212	Aug 14, 2012 by CarlosRexx
	YZ 125 Cylinder (Preview) So, I've got a YZ 125 engine, and wanna know if the YZ head will fit onto a spare DT 125 engine (with no cylinder) I don't want the bottom end of the YZ one, so if anyone wants, they can buy it from me for cheap without the head.. unless head wont fit to the DT, then i'll jus shift the whole engine.. EDIT: I would...	DTCrazedKid	2	221	Jul 27, 2012 by NORFE
	Just after some Infor on Cylinder (Preview) so just bought a standard 1998 dtr can sumone let me know what size the standard piston is what the next size up is (also what size will i have to bore it out) and how much is it ruffly to have it bored and new piston put in thanks in advance guys	DTR_NW	11	231	Jul 11, 2012 by Cameron
	base gasket question (Preview) Just a quick question on the bottom of my cylinder just below the exhaust there is long narrow hole but the base gasket i have will block half of this off its a 3MB00 cylinder will i need to modify the gasket thanks:confuse	gooner78	5	181	Jul 11, 2012 by NORFE
	lowering the cyllinder head/skimming it. (Preview) Hey, has anyone here done this before ? And do you know what a safe amount of lowering / skimming would be ?.. If no one knows im gonna measure the squish myself.	NorDt	0	170	Jul 3, 2012 by NorDt
	what a ported cylinder looks like (Preview) http://cgi.ebay.co.uk/ws/eBayISAPI.dll?VISuperSize&item=290718962241...	NORFE	5	296	Jun 3, 2012 by eG x LoGiKzZ
	modding barrel (Preview) yeah so, i've come to the decision that i wanna drill/dremmel out my barrel but idk where to start on doing this, anyone got tips/images/tutorial on what to do with it to make it perfect? i dont wanna start grinding it down till i know exactly wehre to start etc. cheers now	DTCrazedKid	7	248	Jun 1, 2012 by mr karnage
	Removing the cylinder and cylinder head (Preview) Hi I recently got myself a Yamaha DT 125 RE -06. The piston has ran about 18 000km so I'm about to change piston. My problem is that it's really tight and narrow where the cylinder screws are, and I can't reach them all with my tools. I believe you're able to change piston on these bikes without removing the...	zander	15	309	May 19, 2012 by zander
	Temperature of the engine ? (Preview) Hey, I once seized my cyllinder because it had a too small jet, and i pushed the engine too hard for a long time with a passanger. (Worst case scenario ??) But my question is, If the engine has a too small jet. The engine will still be very hot before it seizes right ?. I have no temperature gauge, But if i di...	NorDt	10	198	Apr 23, 2012 by NORFE
	Banjo Bolts that holds the carb warmer pipes to the cylinder head (Preview) Not sure if this topic should be here or in the carb section. Sorry in advance admin. Hi lads Anyone know the M size of the Banjo Bolts that holds the carb warmer pipes to the cylinder head? Thanks -- Edited by Ralzy on Wednesday 18th of April 2012 09:15:50 AM	Ralzy	3	186	Apr 18, 2012 by NORFE
	GASKETS (Preview) Heard so many stories of ppl buyin wrong/cheap gaskets that i'd post pics of the genuine yamaha gaskets i got during my top end overhaul n rebore	hairdoo	5	182	Apr 4, 2012 by xGINCATx
	How many times can you bore out a barrel? (Preview) The piston in my tdr is knocking around, too small or rings too small? dont know havent had a good look yet, piston has 050 on the top so i assume its been rebored twice, can it be bored out again?	eG x LoGiKzZ	7	203	Mar 31, 2012 by eG x LoGiKzZ
	knocking from the cylinder on start up (Preview) as title says its noticable on start up and when the bikes cold but once its warmed up its not as bad but you can still hear it. Do you think it could be due a rebore last one was 10000 miles ago the thing is it sarts first time every time and still pulls well i can still get 75mph + out of it	gooner78	4	191	Mar 13, 2012 by Calum122
	Different dts different barrels ? (Preview) Okay, i asked this before but im still not quiet shure. Theres alot of you guys here that has some older dts. like 90-2000. Im wondering if this bikes has the same barrel as my dt re 04 ?. a 3MB or something like that. And does also the newer dtx have this barrel ?. If there are different barrel on the differ...	NorDt	4	223	Feb 26, 2012 by NorDt
	master cylinder ( 1 2 ) (Preview) does anyone know how to swap out the standard front box cylinder to a external cylinder one like the rear?	jakeDT125	31	558	Feb 22, 2012 by mr karnage
	is my rear master cylinder fooked (Preview) As title says my rear brake won,t pressurise i,ve bled the system so i know its not that i have really pump the brake pedal to make the piston move a tiny bit at a time and when it reaches the pads it has no power to push on them just wanted to now if i,m in the right area in my potential diagnosis thanks	gooner78	3	153	Jan 20, 2012 by gooner78
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