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DT125R Forum -> Top End -> DT won't go past 40MPH. :-(
Post Info TOPIC: DT won't go past 40MPH. :-(
Calum122


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RE: DT won't go past 40MPH. :-(
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Actually is there a number on the top of that piston?

Also i couldnt see it in pics of bits for the bike but is there a YEIS bottle that sits in the inlet manifold?

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Calum122


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Ok. Im telling you that is a 3BN head. The cylinder is 3mb.

Mate go to search and type in dt engines and read up that thread. Lots of useful information that i am not going to recite.

Looks sweet mate. Looks like standard bore. I'd measure it anyway but should mean you'll just need a standard piston.

Hows the barrel?

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Calum122


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Type YEIS on search too. Without this bottle it will affect performance and ruin the engine. Its a vital component.



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Calum122


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But if you dont have it and its sucking in unfiltered air you'll cause premature wear to the engine

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Boxing


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Didn't have any of them boxes on the top end. Sorry for late reply, it was moved into another category.

I guess I'll have to have a look tomorrow and if not, look about buying one.

Should be ready soon, gave family friend the top end, to rebore it and order the pistons.

You say to run it in 500 miles, but on the threads on here, everyone says they ran them in for 300 miles?

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Calum122


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I'd run a top end in for 500 miles but people will tell you all sorts. Definitely no less than 300. 500 and ypu KNOW its run in.

If it was a full engine rebuild then defo 1000.

Yeah thats good mate. Should be sweet mate once you've done that.

Have you found the YEIS?

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Boxing


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Danny0112 wrote:

Yeh they were clean but then i got wet and dry and skimmed the head like that

have read of my post
http://dt125r.activeboard.com/t52871783/guidance-needed-of-you-kind-fellows/

 

Scrim said you didn't clean it properly...

 

 

Also will try and get another gasket.



-- Edited by Boxing on Friday 5th of April 2013 06:54:45 PM

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Boxing


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Just looked at my new gasket, its identical to the old one that was in the head. Nothing different, same make and everything. I'm taking a wild guess here in Danny having another type of gasket? Mine isn't as white, either. It's a metal colour (if that makes sense.)



-- Edited by Boxing on Friday 5th of April 2013 06:58:38 PM

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Ralzy


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It will fit i think you need to order the BR9EIX one & mate any of the gaskets that aint rubber coated are ****ey dont matter what colour white off white they are Athena or Genuine yami is the only way to go for head gasket



-- Edited by Ralzy on Friday 5th of April 2013 07:21:59 PM

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Boxing


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Didn't have one.

Going to buy one.

Got all the top end done. Now awaiting a petrol tank and the YEIS, along with a spark plug.

Pictures to follow shortly.

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Dt Danny


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The gaskets are a massive no no, get anthena trust me i had problems with the ones from that packet, and im having the same trouble im struggling to do 60 and it wont rev past 7k

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i blew my dt up ... but i fixed it.... Then i crashed it.... but i didnt fix it right and 2 scouser's come in the middle of the night and left me with a working bike 
Dt Danny


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This is what that gasket looked like when i tryed it

IMG_0093.JPG



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i blew my dt up ... but i fixed it.... Then i crashed it.... but i didnt fix it right and 2 scouser's come in the middle of the night and left me with a working bike 
Boxing


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Did you clean the head and bottom end with white spirit before putting the gaskets on?

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Dt Danny


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Yeh they were clean but then i got wet and dry and skimmed the head like that

have read of my post
http://dt125r.activeboard.com/t52871783/guidance-needed-of-you-kind-fellows/


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i blew my dt up ... but i fixed it.... Then i crashed it.... but i didnt fix it right and 2 scouser's come in the middle of the night and left me with a working bike 
eG x LoGiKzZ


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the white head gaskets are only fit for the bin, i never had problems with the base gaskets but the cheap head gaskets are awful

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Dt Danny


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aye i might of not done it perfect first time but i spent that money on that anthena and it was the best £12 i spent on this bike lol

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i blew my dt up ... but i fixed it.... Then i crashed it.... but i didnt fix it right and 2 scouser's come in the middle of the night and left me with a working bike 
Boxing


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Also, anyone here know if this spark plug will fit a DT 125?

http://www.ebay.co.uk/itm/Spark-Plugs-NGK-Iridium-IX-Upgrade-1-of-2-listings-Car-Motorcycle-/221124172194?pt=UK_WSJL_Wholesale_GL&var=&hash=item337c0719a2

Item number: 221124172194

Bike won't be running again for another week or two. I'm awaiting a bunch of parts. Hoping to win this petrol tank on eBay.

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Calum122


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You need to put that gasket in te bin mate. Waste of time and money.

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MDK


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must agree Athena or Genuine yami gaskets we are not being silly about buying others its come to light over a lot of years how these cheaper or other make gaskets fail for some reason .

and even with only my time on this forum I have lost count of the amount of times we have told ppl to get Athena or Genuine yami and they do not listen and every time we see another thread weeks later where they need to rebuild again as the gasket went .


going back a page you say the last owner put wrong spark plug in what make model and code was it ? br8 or br9 ? only ask as I did once have a dtr that would only run on a br8 I think it was as it was a 4dl import and there was something about altitude and pressure with some engines and spark plugs .



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good clean up of a old batterd  dtr  95

 
Boxing


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It was a BR8 IIRC, a BR9 goes in, I think.

I can't remember which way around, but the spark plug was too small, and way too tight.

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Dt Danny


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Yeh boxing mate the guys on here are very helpful and will give you really top notch advice

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i blew my dt up ... but i fixed it.... Then i crashed it.... but i didnt fix it right and 2 scouser's come in the middle of the night and left me with a working bike 
Boxing


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P.S just bought this:
http://www.ebay.co.uk/itm/cylinder-head-gasket-athena-GENERAL-ENGINE-PARTS-YAMAHA-DT125R-89-98-734-42-86-/290887746734?pt=UK_Motorcycle_Parts&hash=item43ba42c4ae

Item number: 290887746734

This one the good one?

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Dt Danny


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Looks good to me

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i blew my dt up ... but i fixed it.... Then i crashed it.... but i didnt fix it right and 2 scouser's come in the middle of the night and left me with a working bike 
eG x LoGiKzZ


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yeah thats the gasket you want, not worth trying to use those white ones, simply dont work properly

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MDK


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yeah that gasket looks better for such little money it can realy save you long term .

your doing a great job by the way she gona run great when your done and you will look back and think thank god I did all this fcking about.

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MDK


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thread gone dead any updates ? you sorted it yet

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good clean up of a old batterd  dtr  95

 
Dt Danny


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Well like i said earlyer in this thread mine was playing up and not wanting to rev past 7k so i took the spark plug out gave it a clean and put it back in and now its fine so boxing i dunno if that could of been your problem but a top end re build wont do it any harm :D

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i blew my dt up ... but i fixed it.... Then i crashed it.... but i didnt fix it right and 2 scouser's come in the middle of the night and left me with a working bike 
Boxing


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Sorry for the dead replies.

Been waiting for parts, didn't really want to update without pictures. Tanks here and everything, but can't seem to locate a YEIS. I'm going to a shop and going to see if they can order me one.

Bikes being done now by my dad. Should be running by tonight. :D

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Boxing


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Ordered one from the shop.

This is what you're referring to? :



 

Because mine doesn't even have that clamp or hole for that bottle to go into. :|  



-- Edited by Boxing on Thursday 11th of April 2013 10:05:50 PM

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