DT125R ARCHIVE

if piston had 100 stamped on it that means its been over bored to 1.00mm so really need to clarify what piston youve put back in this and what you had it bored to ,not having the yeis bottle on or sealing with electrical tape will allow un metred air into it causing an air leak that leak will be sufficient enough to cause all the problems your having with that bike!,and un mixed air that gets past the inlet will cause problems .

some cause high rpm the most severe will stop it starting all together .

this jet is the correct one for you to be using : http://www.yamahamotorcyclespares.co.uk/spares/partImage.asp?GPN=Z68%3C696989%3DF6&uid=0
this is the yeis bottle you should be using :http://www.yamahamotorcyclespares.co.uk/spares/partImage.asp?GPN=Z8JY68%3A%3D65555&uid=0
this is the head gasket you SHOULD use :http://www.yamahamotorcyclespares.co.uk/spares/partImage.asp?GPN=Z8GS666%3D65755&uid=0
this is the base gasket you SHOULD use :http://www.yamahamotorcyclespares.co.uk/spares/partImage.asp?GPN=Z9KZ668%3A65555&uid=0

240 main jet is a safe in the middle jet you should have no problems with it ,as a process of elimination if you have had her bored correctly etc etc and it STILL wont run correctly then its because you havent replaced this yeis bottle ,also upon looking at your inlet somone has reduced the hole size in there with a piece of rubber tube you need to take that out and also make sure you have the little pipe going into the side of it thats your 2 stroke pipe.

this is the correct oil for you to run in on :http://yambits.co.uk/castrol-act-evo-two-stroke-engine-oil-p-8742.html?osCsid=uhni6fre7pv133rcspi20fdrv2

the reason you run in on this oil is to help bed the rings and get everything seated properly.

i speak from experience and have paid the price time and time again do the above and youl have a sweet little bike .dnt do it and youl have a ****ing nightmare .

Calum122 wrote:

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Very good still. But i'm more worried about the unfiltered air damaging the engine.

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cheers callumage :), it will do eventually ,one day he will strt it up say in the garage where air is a little more restricted .it will rev up and die at that point he will again have to rebore etc .etc  i will never ever ever skimp on anything to do with intake or anywhere where 2 mating surfaces meet its a big no no .

Boxing wrote:

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This is a right pain in the backside. Will get oil and jet.

Been running it on synthetic, like my dad said listening to that bloke in the shop. :/

I guess it's fucked then.

Will check the condition of the piston soon. And waiting for the YEIS.

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 good mate make sure you get all of the above i know its dear but you will think "why didnt i do this in the 1st place" if your taking the cylinder off you will have to replace the base gasket to go genuine you wont regret it ,

can you clarify what piston size you have now and what the bore size is now ?

if it deoesnt improve i would next lay bets on either spark plug,air filter,rust in tank if it doesnt improve then next id have the pv locked open unoperational by servo .if all of that doesnt make a difference chances are your cdi is playing up

I put the choke on, blip the throttle start it, flick the choke off and leave it running with no rev. I take a good 10 minutes to get ready, then pull off and change gear a 3K RPMs.

I did three heat cycles of letting it tick over and warm up, then off and let it get cold, then another heat cycle.

And then I did it again before going for petrol. It's all good now, just awaiting parts.

mine is as the picture although the cases have been changed the cylinder is like the rest here , got no piccies its at endlefields being repaired

-- Edited by stillbroke on Sunday 14th of April 2013 08:39:31 PM

The other day all was good.



Was just waiting for the YEIS.

Opened the shed door today, saw this:



Exhaust is pissing oil out at the silencer part. The rubber clip wasn't on properly.

Anyway, got the carb off!



ALL the screws have the heads smashed up, and way too tight. Some right retards been messing around with this bike. Going to get around to stripping the carb down and looking what jet size its running at currently.


Bike now:


Will all be done properly now.

Not ran it since the other day.

I've had my bike absolutely thrashed out of the box. Stolen. Ran with no oil. Ramped by me. And its never missed a beat. Still on original bore. Bike is as sound as a pound.

I know my bike was thrashed by the previous owner because he told me lol. He was very honest and I appreciated it. But like said i've had head gasket go. Warped head. Over heating.

Sorted it out and it is still sound.

Very good bike well impressed with its robustness.

98 on a dt, think ya speedo is out mon haha

i struggle to get to 95 on my DRZ haha

f'ed around with it, added a turbo by the sounds of it mon haha

**** sake i cant undo this can i?

yes! that will be it ! i changed the cases so if the top was tuned to fook and bottom was changed over that would be the problem no?

Nathlaad wrote:

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Take the turbo off lad hahahaha

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 mate its the powerband you see ive got the rainbow one !