DT125R ARCHIVE

madrevs · DTR Senior Member

now a non runner

MDK · DTR Legend

WOULD say do some of the standard type checks .

you say you changed plug ? is there a good spark with the plug resting against head

and strange sounds of feelings when you try to kick it ?

maybe take exhaust of if possible have a look at piston and rings also any signs of oil in rad once its sat over night same as is water level ok along with any signs of water in gearbox oil .

3 main things to go throu

electrical -

fuel/air -

mechanical -

madrevs · DTR Senior Member

Water levels ok will check for oil after work tomoro.theres a good spark when resting on exhaust.plug smells of fuel but I know the carb is seeping fuel from the seals and the mixture screw has been partially drilled out and hole filled (bodge till I found another carb).new carb was ordered yesterday.compression feels ok but im sure it used to feel stiffer and has felt less for a couple of weeks.is it possible to do a compression test with engine cold.maybe all this is linked to the top speed issue I have.glad ive got a car as a backup.also you can hear the piston moving up and down when you kick it.is this normal didnt sound rattly when riding it home though.

madrevs · DTR Senior Member

Also engine started up first kick when leaving work but took a good 7 kicks to get going this morning however I hadnt used it for a week or so

sebamax2 · Guru

change the plug. i was strugling with my other dt for the whole day to get it started, took the head off took the magneto off to check if woodfoof wsnt snaped at the end of the day put a new spark plug in and it started 1st kick without easy spray

madrevs · DTR Senior Member

Will get a new plug from work and try that.thanks

madrevs · DTR Senior Member

New plug fitted tonight still nothing kicked over about 15 times removed plug again plug wasnt wet and smelt very slightly of fuel.should it be dripping with fuel after that many kicks in various throttle positions.also when kicking over exhaust made a funny squelch y noise only way I can describe it lol.but only did it the once

NEV · Guru

is the float sticking in bowl, cutting off fuel/? try undoing the drain screw at bottom of float chamber see if petrol pisses out. Theres a start anyroad.

AndyYam · Guru

compression test, take the pipe off and look up the port at the piston/bore condition. check fuel is coming from the tank, check the filter that sits in the fuel inlet on the carb.

Keep trying things until you find the cause. If compression feels like its gone down then chances are the rings/ piston are damaged so the best option imo would be either the top end off or even easier the exhaust option.

If that all looks good then its a carb problem. Strip, clean ( including all jets) and check the carb settings.

If it turns out its dirt in the carb blocking jets then trace back where its come from. ie. fuel filters in carb and tank damage. air filter needs cleaning replacing.

madrevs · DTR Senior Member

Will see if I can get the exhaust off tomorrow and have a look.drain screw on carb is rounded off butvthe carb is wet with fuel not enough to drip but its definetly leaking.what about spraying easy start into the air box whilst kicking it will a 2 strokevrun on easy start might help diagnose fuel fault.air filter was cleaned and oiled a couple of weeks ago.surely there would be no compression at all if top end had gone though.

MDK · DTR Legend

you tried the drop a bit of fuel down plug hole put plug back in then kick ? if it fires that way can some times lead you to its a fuel.air problem

madrevs · DTR Senior Member

Thats a good idea will give that a try tomorrow. Thanks

madrevs · DTR Senior Member

After trying the fuel down the cylinder it still refuses to start and theres definetly compression still on the kickstart also if it was a piston issue surley it wouldnt of got me the 5 miles home still with plenty of power in the powerband.the engine still sounded sweet just deep like there was a hole in the air box really boggy sound

MDK · DTR Legend

hard to pinpoint what it could be chances are if one of us was standing by the bike we would find the problem in seconds but its hard by reading how some one else says it feels or sounds ..

only thing I can say is dont keep tinkering with diffrent things do things in a order almost a check list in your head eliminating what is ok one by one should lead you to what is not ok .

so try to work out is it

mechanical - engine -gearbox -pv ect

fuel/air combustion - spark - power - air leaks -pv -seals -

electrical - cdi /coil- wireing lose connections or bad earths - plug - cap- cut out switches -

test and check each part and cross them of as good in your head or on paper .

you had the exhaust of and looked at piston-rings with a light is the compression good or just ok ?

SOMETIMES a little video trying to kick it or push starter down with your hand and sounds or rattles can help us guys try to help .

-- Edited by MDK on Tuesday 21st of January 2014 03:43:59 PM

madrevs · DTR Senior Member

Understand what your saying will see if I can get a video.its hatd to say about compression it feels ok though like it has been for a while.will see if I can get a compression tester tomorrow and do a cold compression test

madrevs · DTR Senior Member

Have now got a video how do I upload it to the forum all I can see is a option for images thanks

MDK · DTR Legend

we tend to put them on youtube .

or you can try a video hosting site videobam.com/

madrevs · DTR Senior Member

http://m.youtube.com/channel/UCOFfObv8Da8Mmktha3n5z6w/videos?view=1

hopefully this will work

-- Edited by madrevs on Thursday 23rd of January 2014 07:50:53 AM

MDK · DTR Legend

madrevs wrote:
http://m.youtube.com/channel/UCOFfObv8Da8Mmktha3n5z6w/videos?view=1

hopefully this will work

-- Edited by madrevs on Thursday 23rd of January 2014 07:50:53 AM

the link works but no videos on that account ??

once you upload it to youtube copy the link then on here go to here and when replying click advanced editor reply .

then you should see a page like this ?? click the youtube button and past the url in there .

madrevs · DTR Senior Member

Thanks

-- Edited by madrevs on Thursday 23rd of January 2014 11:05:28 AM

MDK · DTR Legend

madrevs wrote:
Thanks

-- Edited by madrevs on Thursday 23rd of January 2014 11:05:28 AM

this video is sett to private ....meaning no one can view it lol

madrevs · DTR Senior Member

Ooops have changed it too public now can u tell ive never used youtube lol

MDK · DTR Legend

was that video with the plug out or in ?

madrevs · DTR Senior Member

That was with the plug in all the way

MDK · DTR Legend

madrevs wrote:
That was with the plug in all the way

looks very slack then as thou very low or no compression when I do that I realy have to push down and it gets harder as the piston reachs the top .

madrevs · DTR Senior Member

Ohh really might be piston after all then will whip the exhaust off tonight and take a pic of the bore and piston
more money lol

MDK · DTR Legend

madrevs wrote:
Ohh really might be piston after all then will whip the exhaust off tonight and take a pic of the bore and piston
more money lol

thats only my opinion butraly looks way to easy to kick and sounds like no commpression . see what others say also

still good to take zaust of and have a look . tbh when a bike is used lots I take the zaust of at least once a month just to clean up bolts and lube them a little .. saves from breaking them if they become rusted to death . and good to keep a eye on the old piston

try get some good light up there and take pics if need be .

AndyYam · Guru

Very silly idea to try and start it with your hand. quick way to a broke wrist.

Very low on compression. Sounds like piston/ring issues to me. Id take the exhaust of and see what you can see. Looks like its only held on with a cable tie anyway :P.

MDK · DTR Legend

AndyYam wrote:
Very silly idea to try and start it with your hand. quick way to a broke wrist.

Very low on compression. Sounds like piston/ring issues to me. Id take the exhaust of and see what you can see. Looks like its only held on with a cable tie anyway :P.

yeah I got a kick back once it bloody hurt . and lol at the cable tie

madrevs · DTR Senior Member

Oi thats my professional exhaust mount took me ages to make that
Well that confirms it must be the top end as theres definetly not enough force there to break someones wrist.was only using my hand cos had to hold camera aswell