DT125R ARCHIVE

tomimsmith1992 · tomimsmith1992

hello lads just had another piston failure, looks like the locating pin has disappeared allowing the piston ring to rotate and catch the exhaust port. the pictures are attached. What do you lads think could be the cause, i know it was overheating previously due to the wrong jetting, which was sorte...

tomimsmith1992 · tomimsmith1992

Hi again lads following my previous thread i brought a mitika piston and i have fitted it, now there is a distinct ticking noise from the top end. i can only assume this is piston slap. there is no movement on the con rod and it speeds up as revs increase. the noise is present when clutch is pulled in aswell...

tomimsmith1992 · tomimsmith1992

Hi lads looking for a bit of piston advice iv got a 2000 plate dtr with 16000 miles on the clock (dont know if thats legit or not lol) i have brought 2 piston kits in two months these are cheep ebay ones you can get for £22. so the story goes like this brought the bike and the first thing i do is a top end rebuild n...

spadge · spadge

hey guys currently rebuilding another dt but i seem to run into stupid problems and i panic over nothing and always need a second opinion so where better to come than here :D anyhoo just got this new barrel and it measures 55.5mm at the bottom of the bore and dead 56mm at the top im not too sure if this will c...

madrevs · madrevs

This morning riding to work there was a strange vibrating noise at low revs.on the way home it was still there.after around 5 miles the vibration almost went.but then the bike lost bottom end power and was a bit boggy but over 6k revs it still had power.i nursed it the last 5 miles home without letting go o...

Darren · Darren

hi, can anyone tell me where i can get an oversized piston 66.5mm identical to the dtr (same deck height etc). or even better what other bikes use identicle pistons in the above size much appreciated

Calum122 · Calum122

I bought a wossner piston from this website: http://www.forged-pistons.co.uk/ could pay via paypal so that suits me. I recieved a confirmation via paypal but nothing from them themselves saying they have at least recieved the order. Anyway i'm thinking it might be a wild goose chase And was wond...

sebamax2 · sebamax2

so in the dt that i have recently bought when i taken of the cylinder the piston was even bigger than in my other dt which has oversized tzr 58.4 piston. so what does this one have if its even bigger than that

sebamax2 · sebamax2

hi guys so i looked at my old piston and it says 2.00 so i was trying to find one to replace it but pjme has wierd sized after +1 os. i dont know what to get 57.90 or 58.15

Skintt125 · Skintt125

As above lads, Just wondering, as the last thing I want is the chrome barrel fcuked! haven't the money for a new bike yet!! Bikes at 14k miles now and I can nearly be 100% certain the piston was never changed!

Jaybean · Jaybean

hi ya, can anyone tell me if i can get rid of my 2 stroke tank,and just mix the 2 stroke with the petrol,or will this damage the oil pump? Thanks Jay

Barron89 · Barron89

I've been the biggest idiot and completely forgot about the 2t oil! I was rushing to drive 25 miles in the dark and rain on the motorway and the bike kept cutting out over 50 I couldn't work out why so I stupidly kept starting it again with some revs to stir it into life! It only dawned on me to check the oil aft...

zander · zander

http://www.pjme.co.uk/acatalog/Yamaha_DT125R_Engine_Parts_Top_End.html

Calum122 · Calum122

This is actually starting to do my nut in. Can anyone help with this please? Basically there is lots of contradicting informaiton out there on the net with Standard Piston Sizes for different codes of barrels. For Example directly from the Haynes manual: Cylinder barrel Standard bore ID: T...

stillbroke · stillbroke

ai ****ed my bike up by using an old circlip on the piston,anyway its now got deep score marks and was wondering of im going to get away with a 1.50 or even less i dont really wanna take it to 2 mm as thats when they start to go wrong im told cheers

stillbroke · stillbroke

as above how do i go about measuring the end gap on my piston rings on a 1 mm overbore? the haynes specifications state 00.35mm -00.45 but this will be different on an oversize piston surely thanks alot

James Appleby · James Appleby

when doing my head gasket a few weeks back i relised i could with one finger move the piston side to side not loads but like it had to much play , is this right as i thought they should be tight in the bore i was thinking possibly a new set of rings its a standard piston as far as i know abd just touch the 20,000 mil...

stillbroke · stillbroke

as above i just got a new piston and it seems stupidly tight all the sizes are the same and its the same piston ,also 1 ring was thicker than the other the thicker ring would only fit the bottom i have put the piston in the cylinder in the hope that it sat in there for a few hours will aid re fitting it

Jack_92dtr · Jack_92dtr

Hi guys, I got my new piston and rings today is the wider ring for the top and thinner one for the bottom thanks

ezegreenfingers · ezegreenfingers

[IMG][IMG]https://i1250.photobucket.com/albums/hh540/Ezegreenfingers/ecc6402b45485a4...

DT200R MACCA · DT200R MACCA

done about 8mile on my bike and all was fine then started it up about 3 hours l8r and it was still ok got to about 5mile doing 60 at 8rpm in 4th gear and the bike start lossing power/bogging thought it was petrol so i put it on RES then came to a set of lights and it was trying to cut out so i kept revving it and every...

James Appleby · James Appleby

looking for a good compnay to rebore ans supply piston decent piston not over priced ?? cheers lads

SkinBobUk · SkinBobUk

Long story short I got a TDR 125 the other day, my first bike. Anyway first trip out didn't go to well. I barely got 5 mins from my house and it was bogging down as if it was flooded, if i let of the gas it was fine but wouldn't go above 5k rpm. So i pulled over and made sure i'd not left the choke on or anything sill...

JackParker · JackParker

Hi, stripped my top end as head was leaking, found the problem, 2 of the studs are loose, so put 2 inserts in the holes and skimmed the head and top of barrel, thats that sorted. The barrel has a slight scratch init, would problys be ok but iv decided to get it bored. Only thing is its already been bored to the...

zooankski · zooankski

Just received my new Mitaka piston and rings. It looks like one of the rings is wider than the other?? if this is the case then i assume it is the bottom one?. Also where does the thin metl strip go? obviously behind one of the rings but not sure why.

Topic		Started By	Replies	Views	Last Post
	F**kin Pistons What do you lads think Piston ring snapped (Preview) hello lads just had another piston failure, looks like the locating pin has disappeared allowing the piston ring to rotate and catch the exhaust port. the pictures are attached. What do you lads think could be the cause, i know it was overheating previously due to the wrong jetting, which was sorte...	tomimsmith1992	20	3044	Jan 7, 2015 by tomimsmith1992
	Ticking Noise from top End Piston slap (Preview) Hi again lads following my previous thread i brought a mitika piston and i have fitted it, now there is a distinct ticking noise from the top end. i can only assume this is piston slap. there is no movement on the con rod and it speeds up as revs increase. the noise is present when clutch is pulled in aswell...	tomimsmith1992	1	1706	Aug 20, 2014 by MDK
	cheap piston kits failing 2 in 2 months Bad Pistons cheap pistons broken piston rings cheap piston rings (Preview) Hi lads looking for a bit of piston advice iv got a 2000 plate dtr with 16000 miles on the clock (dont know if thats legit or not lol) i have brought 2 piston kits in two months these are cheep ebay ones you can get for £22. so the story goes like this brought the bike and the first thing i do is a top end rebuild n...	tomimsmith1992	4	2580	Aug 17, 2014 by AndyYam
	will this cause piston slap ? (Preview) hey guys currently rebuilding another dt but i seem to run into stupid problems and i panic over nothing and always need a second opinion so where better to come than here :D anyhoo just got this new barrel and it measures 55.5mm at the bottom of the bore and dead 56mm at the top im not too sure if this will c...	spadge	8	2023	Apr 23, 2014 by spadge
	now a non runner ( 1 2 3 4 5 … 11 ) (Preview) This morning riding to work there was a strange vibrating noise at low revs.on the way home it was still there.after around 5 miles the vibration almost went.but then the bike lost bottom end power and was a bit boggy but over 6k revs it still had power.i nursed it the last 5 miles home without letting go o...	madrevs	329	17136	Apr 18, 2014 by madrevs
	66mm+ oversize pistons (Preview) hi, can anyone tell me where i can get an oversized piston 66.5mm identical to the dtr (same deck height etc). or even better what other bikes use identicle pistons in the above size much appreciated	Darren	1	1525	Mar 11, 2014 by sebamax2
	Where to get wossner pistons from? (Preview) I bought a wossner piston from this website: http://www.forged-pistons.co.uk/ could pay via paypal so that suits me. I recieved a confirmation via paypal but nothing from them themselves saying they have at least recieved the order. Anyway i'm thinking it might be a wild goose chase And was wond...	Calum122	19	2933	Feb 17, 2014 by Calum122
	what size piston is it (Preview) so in the dt that i have recently bought when i taken of the cylinder the piston was even bigger than in my other dt which has oversized tzr 58.4 piston. so what does this one have if its even bigger than that	sebamax2	0	1659	Nov 29, 2013 by sebamax2
	+2mm oversize (Preview) hi guys so i looked at my old piston and it says 2.00 so i was trying to find one to replace it but pjme has wierd sized after +1 os. i dont know what to get 57.90 or 58.15	sebamax2	9	2156	Oct 26, 2013 by sebamax2
	How many miles before piston should be changed??? ( 1 2 ) (Preview) As above lads, Just wondering, as the last thing I want is the chrome barrel fcuked! haven't the money for a new bike yet!! Bikes at 14k miles now and I can nearly be 100% certain the piston was never changed!	Skintt125	33	6063	Jun 29, 2013 by Energized
	can i get rid of 2 stroke tank? (Preview) hi ya, can anyone tell me if i can get rid of my 2 stroke tank,and just mix the 2 stroke with the petrol,or will this damage the oil pump? Thanks Jay	Jaybean	4	1869	Jun 28, 2013 by MDK
	Ran oil dry! Then carried on running! (Preview) I've been the biggest idiot and completely forgot about the 2t oil! I was rushing to drive 25 miles in the dark and rain on the motorway and the bike kept cutting out over 50 I couldn't work out why so I stupidly kept starting it again with some revs to stir it into life! It only dawned on me to check the oil aft...	Barron89	28	3183	Jun 28, 2013 by the only way is YAMAHA DTR
	Why does PJME have wierd sizes on Mitaka pistons after 1.00mm oversize? (Preview) http://www.pjme.co.uk/acatalog/Yamaha_DT125R_Engine_Parts_Top_End.html	zander	5	1887	Jun 7, 2013 by Calum122
	Piston Sizes For Different Barrels 3BN 3MB 4FU Coded Barrels (Preview) This is actually starting to do my nut in. Can anyone help with this please? Basically there is lots of contradicting informaiton out there on the net with Standard Piston Sizes for different codes of barrels. For Example directly from the Haynes manual: Cylinder barrel Standard bore ID: T...	Calum122	15	4940	May 21, 2013 by Calum122
	got to have another rebore its at 1.00 now but the scor marks are quite deep is it possible to go to 1.5 ? ( 1 2 ) (Preview) ai ****ed my bike up by using an old circlip on the piston,anyway its now got deep score marks and was wondering of im going to get away with a 1.50 or even less i dont really wanna take it to 2 mm as thats when they start to go wrong im told cheers	stillbroke	35	4140	Mar 10, 2013 by stillbroke
	how to measure piston ring end gap on a +1mm overbore? (Preview) as above how do i go about measuring the end gap on my piston rings on a 1 mm overbore? the haynes specifications state 00.35mm -00.45 but this will be different on an oversize piston surely thanks alot	stillbroke	5	2037	Mar 2, 2013 by NORFE
	piston wobble ? (Preview) when doing my head gasket a few weeks back i relised i could with one finger move the piston side to side not loads but like it had to much play , is this right as i thought they should be tight in the bore i was thinking possibly a new set of rings its a standard piston as far as i know abd just touch the 20,000 mil...	James Appleby	13	2311	Feb 4, 2013 by James Appleby
	piston ridiculously tight (Preview) as above i just got a new piston and it seems stupidly tight all the sizes are the same and its the same piston ,also 1 ring was thicker than the other the thicker ring would only fit the bottom i have put the piston in the cylinder in the hope that it sat in there for a few hours will aid re fitting it	stillbroke	12	2018	Jan 27, 2013 by Calum122
	Wider Piston ring (Preview) Hi guys, I got my new piston and rings today is the wider ring for the top and thinner one for the bottom thanks	Jack_92dtr	3	1463	Jan 17, 2013 by Calum122
	Need help (Preview) [IMG][IMG]https://i1250.photobucket.com/albums/hh540/Ezegreenfingers/ecc6402b45485a4...	ezegreenfingers	9	2049	Jan 6, 2013 by GADGET
	think my rings might of gone (Preview) done about 8mile on my bike and all was fine then started it up about 3 hours l8r and it was still ok got to about 5mile doing 60 at 8rpm in 4th gear and the bike start lossing power/bogging thought it was petrol so i put it on RES then came to a set of lights and it was trying to cut out so i kept revving it and every...	DT200R MACCA	17	2010	Jan 1, 2013 by BigPhil
	any one recommend some one to rebore and provide piston (Preview) looking for a good compnay to rebore ans supply piston decent piston not over priced ?? cheers lads	James Appleby	7	1461	Dec 8, 2012 by superted
	Dead piston..... ( 1 2 ) (Preview) Long story short I got a TDR 125 the other day, my first bike. Anyway first trip out didn't go to well. I barely got 5 mins from my house and it was bogging down as if it was flooded, if i let of the gas it was fine but wouldn't go above 5k rpm. So i pulled over and made sure i'd not left the choke on or anything sill...	SkinBobUk	42	3364	Nov 17, 2012 by SkinBobUk
	Anyone got there dt bored to 58.4 and using the tzr piston? (Preview) Hi, stripped my top end as head was leaking, found the problem, 2 of the studs are loose, so put 2 inserts in the holes and skimmed the head and top of barrel, thats that sorted. The barrel has a slight scratch init, would problys be ok but iv decided to get it bored. Only thing is its already been bored to the...	JackParker	5	1562	Oct 13, 2012 by louisBOSS
	new piston (Preview) Just received my new Mitaka piston and rings. It looks like one of the rings is wider than the other?? if this is the case then i assume it is the bottom one?. Also where does the thin metl strip go? obviously behind one of the rings but not sure why.	zooankski	1	1411	Oct 13, 2012 by FunkeyMunkeyDavid
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