DT125R ARCHIVE

the only way is YAMAHA DTR · Guru

RE: THE holy grail, 3XP00 cylinder prodject

the only way is YAMAHA DTR · Guru

little update,

i changed my order to standard size piston

what i didn't know is that the nikasil was plated straight to the barrel without a steel sleeve

the plating is in perfect condition, these barrels where never made to be rebored, because the plating is so hard,

the wr200's in the USA are all steel sleeved, and the nikasil ones are gold dust to the yankys as an upgrade according to the guy who i bought the piston from.

no idea where the plated barrels were released blankstare

but the wiseco rings are fine to run in my barrel so alls good

NORFE · DTR Trusted Engine Builder

iv never nown a plated sleeve on any bike pal, all the mxers are just plated straight on to the barrel all the bores iv seen are either sleeved or plated confuse

the only way is YAMAHA DTR · Guru

ye i know but it looked like it had a sleeve from looking at the top of the barrel. was just an outline where the old gasket had been

NorDt · Guru

But what if the engine of one of those are seized ??, Are they unborable ?. Someone told me that since the dt 125s has nicasil in the barrel, They cant be bored :S can someone explain this ?. cause theres not uncommon to bore a dt barrel..

stroker · DTR Senior Member

Plated is just far more trouble, have you seen how much to get a bararal replated?

Much prefer sleev

NORFE · DTR Trusted Engine Builder

all plated cylinders have to be machined or chamically stripped of the old plating

repaired /welded or what ever then bored slightly over size

then there plated over size then diamond honed to spec size

sleeved cylinders normally get 4-5 over bore sizes befor the sleeve has to be pressed out and a new one fitted

then honed to spec size

smile

stroker · DTR Senior Member

Yep, hence why its costly, plus cant bore it to a bigger cc

NORFE · DTR Trusted Engine Builder

dont they make over size pistons for the wr 200 then pal?? confuse

the only way is YAMAHA DTR · Guru

nikasils can be rebored, not as much as a sleeved barrel and it is very expensive nikasil plating unless you got contacts smile

but they do make oversized pistons and steel sleeves (about £60) for the wr200,

the nikasil barrels are rare shizz biggrin and more "racey" nikasil is hard as fook and even if the piston skirt melts the barrel doesn't score, usually the bore gets covered in a thin layer of melted piston giving the illusion of a scored barrel, but this can be fixed easy

not using the bike as a comuter just pleasure...

NORFE · DTR Trusted Engine Builder

yeah i no they can, i thort with what he was saying is the wr 200 only comes in 1 size thought it was odd lol

yeah its hard but iv managed to kill a few barrels specially hondas as there weak on the exhaust bridges, and plating chips and all sorts if the piston siezes bad, but yes most is ally welded on to it theat can be chemically stripped, then honed then used again

but its way to expensive for my liking, if things go wrong once ite £120

where as if its got a liner in its 20 quid a rebore biggrin

the only way is YAMAHA DTR · Guru

today i fitted M10 helicoil kit to the head studs, the person before drill them with a handdrill on the p1ss to 10mm

redrilled and tapped the exhaust studs

pistons here very nice quality similar to the wossner i have

masked up head and barrel ready to be powder coated

cranks at the Depo

the only way is YAMAHA DTR · Guru

little update,

cranks here, small end bearing and crank bearing, atually made by KOYO JAPAN

barrels powdercoated White, heads going to be Blue

just got to wait until my garages work is done so i can get the engine out,

Calum122 · Guru

I just jizzed in my pants!

Calum122 · Guru

This thread is wicked!

the only way is YAMAHA DTR · Guru

thanks,

got to do some modding to the primary drive gear and magneto

but got some very skilled people helping me on this prodject smile

Calum122 · Guru

So excited for you. Have you got a decent video camera? I wana hear her when you first fire her up!!!

Calum122 · Guru

To be honest I'm probably not the only one.

the only way is YAMAHA DTR · Guru

ye, i have a good camera, will probably get it on a dyno even though they are very variable and not that accurate,

got to get the fmf exhaust,

i will be selling my DEP and topend with the wossner piston 600miles since rebore and 3mb head if anyones interested

Calum122 · Guru

I would be, but I got a million and 1 other problems to sort out first haha! I'm actually looking to get a full DEP system when I start doing performance. Any better than the gutted standard? I only really want it for looks. So that means i'm looking at a new one cause otherwise whats the point right?

the only way is YAMAHA DTR · Guru

wont fit your re

Calum122 · Guru

True. But a brand new one will. Which is what I would want cause I want it looking spanking. Greese her up from day one.

birdys3 · DTR Respected Member

right am sure this has probabally been covered b4 so sorry guys, but ive been offered a wr200 barrell and head no piston, wud it fit my 02 dtr bottom end??????
and if so wud there be much involved or wud it be a strait swap??? the cylinder looks pretty simaler

Calum122 · Guru

birdys3 wrote:
right am sure this has probabally been covered b4 so sorry guys, but ive been offered a wr200 barrell and head no piston, wud it fit my 02 dtr bottom end??????
and if so wud there be much involved or wud it be a strait swap??? the cylinder looks pretty simaler

I'm no expert but a whole complete bottom end rebuild. The idea here is that you could 'fool' the cops in thinking you own a 125. 125 number plate and frame so it wouldn't come up by the police. The stroke length is different so new crank is needed. It's a lot of work mate. If you've got a full license then just get the bike. Unless you like a challenge and are very knowledgable

birdys3 · DTR Respected Member

birdys3 wrote:
right am sure this has probabally been covered b4 so sorry guys, but ive been offered a wr200 barrell and head no piston, wud it fit my 02 dtr bottom end??????
and if so wud there be much involved or wud it be a strait swap??? the cylinder looks pretty simaler

the only way is YAMAHA DTR · Guru

buy it, and sell it and make a profit smile

does it have a steel sleeve or plated bore?

they are rare as fook , so clean it up and paint it then make some £££ or do a conversion wink

gooner78 · Guru

the only way is YAMAHA DTR wrote:

ye, i have a good camera, will probably get it on a dyno even though they are very variable and not that accurate,
got to get the fmf exhaust,
i will be selling my DEP and topend with the wossner piston 600miles since rebore and 3mb head if anyones interested

Hi mate i would be very intrested in the wossner piston and recently rebored cylinder could you pm me with a price thanks

the only way is YAMAHA DTR · Guru

it will be a while before i sell that or the dep

the only way is YAMAHA DTR · Guru

i have orderd a gilera sc125 engine to fit my wr barrek to because its a shame to dismantle a perfectly good engine,

pistons seized on standard bore aparently

parts that i wont need will be

barrel 3mb00 with powervalve

or i could sell the powervalve with servo as a Kit for someone that hasnt got the servo

head 3mb

crank

looks like it comes with a pv servo

inlet manifold and reeds

boost bottol

maybe cdi if included

parts should be ready after the 22nd as im going away, but might have them off the engine before

the only way is YAMAHA DTR · Guru

and starter motor