DT125R ARCHIVE

Calum122 · Calum122

How To Skim Barrel & Head Due to this being a common issue I've decided to take the time to type up how I skim my barrels and heads. I've been doing this method for years and it seems to work a trick. By no means am I professional mechanic but I would like to share how it's worked for me.Firstly I would lik...

stillbroke · stillbroke

Many things work the same way more or less. To me pretty much theory just is.. By rights this should be the 4th in a series. Compression is the first test of all tests... Spark is the 2nd test Fuel is the 3rd test, and each of the above has a routine in order to follow, so you are not guessing. Vac Leaks: A...

Seiki · Seiki

This section is for Top end components only.

darkangel · darkangel

Parts you need: Top end gasket set (base gasket, head gasket, exhaust gasket)Piston kit (Piston, rings, expander ring, circlips, piston rod)Top end bearing 1. Remove sidepanels. 2. Remove seat. 3. Remove fuel tank 4. Remove front exhaust and throw away old copper exhaust gasket 5. Drain coola...

djaniero · djaniero

I m doing a top end rebuild on my bike over the weekend, and have read quite a lot of different methods of the best way to run the engine in. I came across this article about running the engine in hard. Quite an interesting read. Some of you guys may have read it already: http://www.mototuneusa.com/brea...

sindre98 · sindre98

Hi i have done a top end rebuild now, rebored barrel too 57 mm. the bike started at the first try but after a little time it made a rattling sound. took the top off and piston was fine but as you can see in the video there is some marks above the exh...

SMurF_12 · SMurF_12

Just wondering what is the biggest size rebore for the stock cylinder without any issues with the powervalve??

BigPhil · BigPhil

Hi guys Have a bit of a problem, dt is rattling fairly loudly so i thought as the main bearings where recently done id take top end apart and inspect bottom end play (minimal to none present) and i replaced the piston and rings and the small end bearing, i also ground powervalve down just in case even thou...

oli_125 · oli_125

Alright, theres a tiny knocking noise that you can barely hear even when listening for it from my topend, probably just exhaust gasses, but i want to fit a new piston anyway, done 30k onit since ive owned it, an its still on origional size. Was wonderingif there would be any point in me dropping the barr...

Grantypanty · Grantypanty

I blew my bike up yesterday & i'm getting it rebored on saterday. My dad who was a mechanic said ride at 30mph for 500 miles. Took me a week to do it. 70 miles a day I did this last time with my honda mtx & it ran like a ****ing beaut afterwards. How would you do it?

L_COLE · L_COLE

http://m.ebay.co.uk/itm/321434297742?nav=SEARCH

Broonmeister · Broonmeister

Alright guys wondering if u could help me. Bought my dt125r in january and it blew up taking the barrel with it. Anyway i replaced the barrel and piston. Put it all back together with a small hole in my exhaust. She ran fine. Pegged the pv open and it was lovellly. Took my exhaust up a friends and we patched i...

spadge · spadge

Can't feel any imperfections but it blew here last time would this be classed as cracked :/

spadge · spadge

just wondering is there a specific tightening method for the head bolts? ive just been trying to tighten in a star like pattern ?

Broonmeister · Broonmeister

Hey guys wondering if you could help me. Piston went on me and took a nasty chunk out or my barrel right on the exhaust port. Ive been scouring everywhere trying to find a replacement but i cant seem to find any? Maybe if someone on here could point me in the right direction. Would even consider buying whol...

zooankski · zooankski

Just put a re bored barrel and 57mm mint aka piston on to a mates bike. Thought I would check compression while I was there and it is only 65 psi. pulled barrel back off and all looks good. Any ideas? Hopefully not a head gasket or that's a tenner down the toilet. -- Edited by zooankski on Sunday 11th of May 2...

SMurF_12 · SMurF_12

As above really. What spark plug should i be using with a 170 bore?? Thanks

Broonmeister · Broonmeister

Hi guys, bought a 2001 dt a few weeks ago, shes run like a dream started first kick everytime, everything fluid wise was changed or topped up oj bike including fresh gearbox oil etc. The other day i was riding home and my dep pipe blew a hole right under the manifold, thinking nothing i plodded onto a frien...

yamahadt125 · yamahadt125

Can someone tell me what a size is a stranded size piston is. will a piston of ebay come wth rings all gapped and ready to be fitted into bike? haven't measured cylinder all looks good so a standed piston should be.fine?

WooDooUK · WooDooUK

Howdy, I was on my way to the MOT station when my 2000(W) DT125r broke down. It just stopped and refused to restart. With no warning what so ever. after cleaning the carb thoroughly, new plug and checking the spark the only thing left was compression. A compression test came back with 80psi (tested onl...

SMurF_12 · SMurF_12

Hey all Just a quick question. How much is a 3MB cylinder & head worth in good condition?? Cheers

Dt Danny · Dt Danny

After my mates come down to have a look at my bike this ends up happing .....

yoshi · yoshi

thinking about doin my top end and fit a mitaka piston of ebay, can anyone recommend a good workshop in london to rebore and get the head skimmed. thanks guys

spadge · spadge

hey guys i seem to post more problems on this than solutions xD the other day my bike was really quiet on the start up i mean like silent as if i was using a standard pipe on it ( dep currently fitted) and after a few miles it finally just got louder im confused. dunno if it was the oil i was using my local garage...

yoshi · yoshi

http://www.ebay.co.uk/itm/400554334666?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649

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
	STICKY: How To (I) Gentle Skim Your Head & Barrel (Preview) How To Skim Barrel & Head Due to this being a common issue I've decided to take the time to type up how I skim my barrels and heads. I've been doing this method for years and it seems to work a trick. By no means am I professional mechanic but I would like to share how it's worked for me.Firstly I would lik...	Calum122	13	1457	Feb 6, 2015 by Calum122
	STICKY: Air Leaks Fault Diagnostics (closed) Air Leaks How To Diagnose Find High Revs Revving (Preview) Many things work the same way more or less. To me pretty much theory just is.. By rights this should be the 4th in a series. Compression is the first test of all tests... Spark is the 2nd test Fuel is the 3rd test, and each of the above has a routine in order to follow, so you are not guessing. Vac Leaks: A...	stillbroke	0	1366	Feb 12, 2013 by stillbroke
	STICKY: Guidelines (Preview) This section is for Top end components only.	Seiki	0	1032	Mar 26, 2012 by Seiki
	STICKY: FAQ - Top end rebuilds, running in, e.c.t (closed) (Preview) Parts you need: Top end gasket set (base gasket, head gasket, exhaust gasket)Piston kit (Piston, rings, expander ring, circlips, piston rod)Top end bearing 1. Remove sidepanels. 2. Remove seat. 3. Remove fuel tank 4. Remove front exhaust and throw away old copper exhaust gasket 5. Drain coola...	darkangel	0	2431	Nov 5, 2007 by darkangel
	Top End Rebuild..Running It In Hard (Preview) I m doing a top end rebuild on my bike over the weekend, and have read quite a lot of different methods of the best way to run the engine in. I came across this article about running the engine in hard. Quite an interesting read. Some of you guys may have read it already: http://www.mototuneusa.com/brea...	djaniero	2	1084	Jun 10, 2015 by Calum122
	rattling and cylinder marks (Preview) Hi i have done a top end rebuild now, rebored barrel too 57 mm. the bike started at the first try but after a little time it made a rattling sound. took the top off and piston was fine but as you can see in the video there is some marks above the exh...	sindre98	4	1117	Mar 25, 2015 by Calum122
	how big can the stock top end go (Preview) Just wondering what is the biggest size rebore for the stock cylinder without any issues with the powervalve??	SMurF_12	6	1277	Dec 22, 2014 by AndyYam
	Rattle !! (Preview) Hi guys Have a bit of a problem, dt is rattling fairly loudly so i thought as the main bearings where recently done id take top end apart and inspect bottom end play (minimal to none present) and i replaced the piston and rings and the small end bearing, i also ground powervalve down just in case even thou...	BigPhil	10	1785	Oct 3, 2014 by tomimsmith1992
	rebore (Preview) Alright, theres a tiny knocking noise that you can barely hear even when listening for it from my topend, probably just exhaust gasses, but i want to fit a new piston anyway, done 30k onit since ive owned it, an its still on origional size. Was wonderingif there would be any point in me dropping the barr...	oli_125	5	1156	Sep 6, 2014 by Victor
	How would you run in your top end piston & rings? (Preview) I blew my bike up yesterday & i'm getting it rebored on saterday. My dad who was a mechanic said ride at 30mph for 500 miles. Took me a week to do it. 70 miles a day I did this last time with my honda mtx & it ran like a ****ing beaut afterwards. How would you do it?	Grantypanty	20	1360	Aug 11, 2014 by Calum122
	I smell Bull**** (Preview) http://m.ebay.co.uk/itm/321434297742?nav=SEARCH	L_COLE	2	1111	Jun 20, 2014 by MDK
	help needed (wasnt sure where to post) (Preview) Alright guys wondering if u could help me. Bought my dt125r in january and it blew up taking the barrel with it. Anyway i replaced the barrel and piston. Put it all back together with a small hole in my exhaust. She ran fine. Pegged the pv open and it was lovellly. Took my exhaust up a friends and we patched i...	Broonmeister	12	1254	Jun 17, 2014 by Victor
	Cracked head? (Preview) Can't feel any imperfections but it blew here last time would this be classed as cracked :/	spadge	1	1182	May 21, 2014 by Calum122
	bolt tightening sequence (Preview) just wondering is there a specific tightening method for the head bolts? ive just been trying to tighten in a star like pattern ?	spadge	2	1015	May 20, 2014 by spadge
	2001 dt125r cylider. (Preview) Hey guys wondering if you could help me. Piston went on me and took a nasty chunk out or my barrel right on the exhaust port. Ive been scouring everywhere trying to find a replacement but i cant seem to find any? Maybe if someone on here could point me in the right direction. Would even consider buying whol...	Broonmeister	1	1073	May 17, 2014 by gooner78
	New build top end compression (Preview) Just put a re bored barrel and 57mm mint aka piston on to a mates bike. Thought I would check compression while I was there and it is only 65 psi. pulled barrel back off and all looks good. Any ideas? Hopefully not a head gasket or that's a tenner down the toilet. -- Edited by zooankski on Sunday 11th of May 2...	zooankski	15	1131	May 12, 2014 by zooankski
	which spark plug for 170 bore (Preview) As above really. What spark plug should i be using with a 170 bore?? Thanks	SMurF_12	2	981	Mar 6, 2014 by Victor
	2001 DT125 starting problem (Preview) Hi guys, bought a 2001 dt a few weeks ago, shes run like a dream started first kick everytime, everything fluid wise was changed or topped up oj bike including fresh gearbox oil etc. The other day i was riding home and my dep pipe blew a hole right under the manifold, thinking nothing i plodded onto a frien...	Broonmeister	20	1349	Feb 14, 2014 by Broonmeister
	Top end rebuild ( 1 2 3 ) (Preview) Can someone tell me what a size is a stranded size piston is. will a piston of ebay come wth rings all gapped and ready to be fitted into bike? haven't measured cylinder all looks good so a standed piston should be.fine?	yamahadt125	89	4256	Jan 26, 2014 by Calum122
	Sudden Compression Loss (Preview) Howdy, I was on my way to the MOT station when my 2000(W) DT125r broke down. It just stopped and refused to restart. With no warning what so ever. after cleaning the carb thoroughly, new plug and checking the spark the only thing left was compression. A compression test came back with 80psi (tested onl...	WooDooUK	8	872	Jan 9, 2014 by AndyYam
	3MB top end value?? (Preview) Hey all Just a quick question. How much is a 3MB cylinder & head worth in good condition?? Cheers	SMurF_12	1	751	Dec 8, 2013 by Calum122
	well **** has hit the fan ( 1 2 3 ) (Preview) After my mates come down to have a look at my bike this ends up happing .....	Dt Danny	70	2944	Nov 27, 2013 by Dt Danny
	where to rebore and get the cylinder head skimmed in london (Preview) thinking about doin my top end and fit a mitaka piston of ebay, can anyone recommend a good workshop in london to rebore and get the head skimmed. thanks guys	yoshi	13	980	Nov 6, 2013 by Dt Danny
	quiet start up ? (Preview) hey guys i seem to post more problems on this than solutions xD the other day my bike was really quiet on the start up i mean like silent as if i was using a standard pipe on it ( dep currently fitted) and after a few miles it finally just got louder im confused. dunno if it was the oil i was using my local garage...	spadge	4	738	Oct 29, 2013 by spadge
	will a tzr 2RHOO cylinder barrel fit a dtr 03bn, still want to use my cylinder head (Preview) http://www.ebay.co.uk/itm/400554334666?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649	yoshi	0	666	Aug 21, 2013 by yoshi
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