DT125R ARCHIVE

MDK · DTR Legend

RE: DT won't go past 40MPH. :-(

Calum122 · Guru

Do not run it without the YEIS. Or at the very least block it up.

Boxing · Guru

Also, the guy in the Kawasaki shop said to me "Oh, there's no point in running the bike in on mineral oil! Just use fully synthetic, it'll be fine, unless you did a bottom end rebuild" I explained to my dad, that they're a shop, they'll tell you that and you blow up your bike, then you need a new bike, they're the people to sell you a shitty chink one. But no, my dads right, I'm wrong.

So when this piston goes, I'll be barking up his tree for money for the rebuild along with "I told you so".

Also the YEIS is a little black box on my model? If so, I may, may have it in the shed. I'll look better tomorrow.

Calum122 · Guru

That YEIS bottle is off a dt125lc.

You want the one for the DTR. Its not as pretty as that one but its important you get the right one.

Run the engine on mineral oil to begin with. You're not going to be thrashing the bike anyway so it won't matter about fully synthetics yet anyway. Once the engine is ran in switch to fully synthetic. It is very logical why you use mineral oils to begin with. It is all here on the forum if you want to learn a thing or two. It is all here.

MDK · DTR Legend

heres how the dtr yeis bottle looks

the one on the left

Boxing · Guru

Mine hasn't even got that black clip for the pipe to go on to. :/

Literally nothing for the YEIS to attach to. :/ Someone must have been messing around with this bike.

Anyway, putting it back together later. And my YEIS is on order at a shop.

Calum122 · Guru

Well in that case you're going to need the inlet manifold that will hold the YEIS. and the gasket as well.

Calum122 · Guru

This looks like the one.

http://item.mobileweb.ebay.co.uk/viewitem?itemId=400419377017&index=7&nav=SEARCH&nid=34272860033

Ralzy · Guru

If you have a full dep you should of done rejetting to suit as soon as put new zaust on mine takes a 240. Best bet take the carb off check the number and see what you have in there

-- Edited by Ralzy on Saturday 13th of April 2013 01:30:42 AM

Ralzy · Guru

If jetting is incorrect it will cause loads of running issues weither it be too rich or to lean. If it is running too lean and not cured it will cause engine seizure Running lean makes the engine run hot. This tends to lead to 'pinging'/'knocking', or preignition. This causes greatly increased cylinder pressures and heat, and can hammer bearings, crack piston rings the list goes on...so its vital to have the correct jetting

-- Edited by Ralzy on Saturday 13th of April 2013 01:20:56 AM

Ralzy · Guru

Its better to run rich than lean It shouldn't really hurt your engine, but it will foul your plug

-- Edited by Ralzy on Saturday 13th of April 2013 01:27:36 AM

Boxing · Guru

Upon further inspection, bike has the holder. Blocked it with some tape.

Been riding it shifting gear at 5,000 RPMs. Maximum of 30MPH.

Happy to have a bike again.

Calum122 · Guru

Hang on. So is the hole blocked up?

Otherwise you SHOULDN'T ride it like i said. It will ruin your engine. Absolutely destroy it!

Dt Danny · Guru

yeh i think he said he did block it up

MDK · DTR Legend

so the bikes all fixed and running now ?

remember no matter how tempted you get dont go rapeing the engine you will regret it later if you do . run it in great and once done she should last you a good while

Dt Danny · Guru

Guys does your engine in wet weather seem to not perform aswell ?

Boxing · Guru

Back to square one.

The YEIS was covered with electrical tape, whether the tape held in for the 40 odd miles or not I don't know. I'll look again tomorrow.

Bike seems very sluggish, just like before. No knocking etc, but extremely under powered struggling up hills etc.

I look at the old piston upon close inspection in the sun, it had "100" stamped on the top.

Been shifting gear every 5,000 RPMs. It keeps bogging down in 6th, at 30MPH. I get it to about 4,000 RPMs full rev it, then it bogs down and stalls unless I pull the clutch in and down shift, but even then I'm down to 20MPH. :|

This is annoying now.

Boxing · Guru

Also, does the DT need upjetting if it's had the full DEP system fitted? And would these symptoms go along with the wrong jet?

It seems like it's absolutely got no 6th gear.

Dt Danny · Guru

Try a new spark plug you could just be getting a week spark

Boxing · Guru

It has a brand new spark plug, when I did the topend.

Will see about upjetting it.

Cheers.

Boxing · Guru

Will strip it down tomorrow and have a look.

Boxing · Guru

It's smoking a lot, so I guess it's running rich.

I've done 40 odd miles on it today as well. I guess there's another piston gone... :|

MDK · DTR Legend

and be 100 % sure that yeis hole is sealed up correct with no leaks use a cork and tape it up well so it is air tight ..thats asumeing you have not got the yeis bottle yet ? if its sucking in air there that will also cause same type of issues

Boxing · Guru

I had tissue and tape, but the tissue got pulled out due to having some carb problems (it was pissing petrol out every where) and then put a bit of tape over it.

Bike will be in bits again tomorrow.

Thanks for all the information.

Dt Danny · Guru

where abouts do you live ?

Boxing · Guru

Leicester.

Calum122 · Guru

You realpy should just wait until you've got that bottle before riding it. Personally. A bit of tape sounds a bit gash amd not worth the risk.

Get the bottle on then ride it. You might find that is your problem.

Otherwise we will start to look at otger reasons. Now we know its not the top end it will have to be something else.

Boxing · Guru

I think it's the upjetting that needs to be done. Can't seem to find 240 and 250 jets? Anyone know where I can get them?

Buying some more of them little ring things, and putting the standard exhaust on. The YEIS bottle should be here soon.

I'll see if it runs any better then.

Calum122 · Guru

Has the carb not got 240 jet already. That is standard jet and you wont need it changed even if you have after market exhaust.

Lets see if its the bottle first mate.

Then we'll worry about spending money.

It might just need a clean. Clean carb. Fresh fuel. New reeds. But we'll go to that later.

Boxing · Guru

Guy on the phone at the shop said the standard jet is 210 for the DT125R 1997. And that's the only one they can order.

Awaiting the bottle now. Should be between 4-7 days.

Ordered some carb gaskets too. As it's showing signs of needing a clean, it pissed out 5 litres of petrol through the overflow and other pipes. Not leaking now, but still going to clean it. And see what jet size I have.