DT125R ARCHIVE

coastie123 · DTR Senior Member

Full bottom end rebuild kit?

NathanH · DTR Senior Member

Does anyone supply a whole kit; bearings and gaskets etc. Or can anyone list a few sites or companys who supply the parts at a good price? Is it also worth buying a new crank or recon your existing? confuse

Cheers

NORFE · DTR Trusted Engine Builder

recon urs pal

pjme sell all the bits at an ok price

http://www.pjme.co.uk/acatalog/Yamaha_DT125R.html

every fing in there ull need

not much cheaper every where else plus all one order so less postage

all the other gear box bearings are just off the shelf spec so cheap off ebay or ur local shop smile

NathanH · DTR Senior Member

Cheers guys. The thread on the drive end of my crank is wrecked so I may awsell buy a new one, could buy a second hand one then recon but will probably work out about the same. Also NORFE, do you remember my vibration issue? I worked out what it was, when the crank gear nut came off the woodruff key moved meaning the gear that feeds the balancing shaft stopped spinning resulting in the engine being out of balance... causing the vibration. I then fixed the gear by welding the nut on and replacing the key but the damage must have already been done and an enthusiastic ride out killed the big end bearings.

NORFE · DTR Trusted Engine Builder

oh dear lol

oh well recon it all u may aswell do the gearbox bearings then for the extra tenner or so, complete fresh motor then smile

coastie123 · DTR Senior Member

This is the One I was lOoking at

http://www.adrenalin-pedstop.co.uk/p-Top_Racing_original_crankshaft_for_Yamaha_DTR_125cc-3890.aspx

Calum122 · Guru

How hard is it for a bottom end rebuild?

NORFE · DTR Trusted Engine Builder

coastie123 wrote:
This is the One I was lOoking at

http://www.adrenalin-pedstop.co.uk/p-Top_Racing_original_crankshaft_for_Yamaha_DTR_125cc-3890.aspx

there to be avoided so i got told on here mate ! just get a mitaka rod kit and get ur crank rebuilt mate 60 quid loads cheaper !

NORFE · DTR Trusted Engine Builder

depends how mechanically minded u are mate

its simple really just have to follow a manual and get the parts

nothing to them really these small engines

if your in doubt take photos as your stripping it always helps

more you do your self the more you learn and the more satisfaction u get when doing it!

no point paying some one to do some thing you can do your self just need to have some faith lol smile

NORFE · DTR Trusted Engine Builder

HERES ONE

http://www.ebay.co.uk/itm/DT125R-con-rod-kit-DTR125-big-end-small-end-con-rod-DTR-125-FAST-POST-/350532020840?pt=UK_Motorcycle_Parts&hash=item519d562a68#ht_500wt_969

THEN YOU NORMALLY GET PLACES THAT BUILD CRANKS FOR ABOUT 20 QUID

coastie123 · DTR Senior Member

I ended getting my crank rebuilt and it cost me about 20-30 quid... A lot cheaper than new crank!

Calum122 · Guru

Yeah. When I get another mode of transport I'll probably just do it myself. Be a winter job lol.

NORFE · DTR Trusted Engine Builder

cud ride in to the garage

strip and build in a morning then ride out its not a big job

3-4 hours max if you have all the parts and depends how quick u are lol smile

Calum122 · Guru

I am ultra SLOW! I snap most things I touch. I cause more problems than I solve lol. But I'm up for giving it a go to be honest.

Dr Pepper at the end of the day. Dr Pepper...

NORFE · DTR Trusted Engine Builder

just find your self a knackered bottom end to strip and build practice makes perfect most mx 2 strokes bottom ends are the same, just difrent parts/designs

NathanH · DTR Senior Member

I was looking at those cranks from adrenalin, whats the issue with them?!

coastie123 · DTR Senior Member

i know they advertise them DTR/TZR crank...

the issue i know of them is the TZR has a smaller stroke than the DTR - or the other way round...

Im sure someone like Norfe will be able to confirm this!!

NathanH · DTR Senior Member

Anyone got a spare crank then... :)

NORFE · DTR Trusted Engine Builder

i found them and put them in the links section and

look

http://dt125r.activeboard.com/t48387727/any-1-after-a-crank/

Calum122 · Guru

NORFE wrote:
just find your self a knackered bottom end to strip and build practice makes perfect most mx 2 strokes bottom ends are the same, just difrent parts/designs

Fook me NORFE that is a fair point! Lol. I went for a walk thinking about how I was going to do this. What I came up with was to go to a scrappy and buy another DT engine (Plenty there) and ride it with that whilst I work on mine. But WTF haha your idea makes much more sense lol. Just buy a scrappy DT125RE engine and build that one brand new. Then swap it over for mine. Then go ahead and rebuild mine. Spares lol.

No but seriously thats a good point actually. Think I might do that. One day. When I've got a job.

NORFE · DTR Trusted Engine Builder

coastie123 wrote:
i know they advertise them DTR/TZR crank...

the issue i know of them is the TZR has a smaller stroke than the DTR - or the other way round...

Im sure someone like Norfe will be able to confirm this!!

tzr & early dt's stroke are 50.0 mm (1.97 inch)

dtr 3rn1 onwards stroke are 50.7mm (2.00 inch)

so the difference is verry minimal

you could match it with a thinner/ or thicker base gasket !

biggrin

NORFE · DTR Trusted Engine Builder

well i was gonna do same but, its that quick to do if mine dies id just get it done, its only a weekend toy and dont matter to me if its not working/have a van and a car to use. i no alot on here rely on there trusty steed so different for them

best thing my dad ever did he just bought me a couple of scrap motors from a carboot, gave me a tool box and sed crak on

best way to learn smile