dt125r running problems

[Dusty]

My dt, which I've only had running for a couple of weeks has ground to a halt again today.

I'd been riding it for about half an hour and had just done 5 minutes on dual carriageway with it just about maintaining 65mph (I'm guessing it's restricted?). I turned off onto a country lane and it seemed to start loosing power, kept going for about a mile and then cut out almost like it had run out of petrol.

There was a small amount of smoke coming from around the spark plug and that bit of the engine was very hot. So I let it cool down for 15 minutes and tried to kick it over, but it didn't want to start and it felt like there was less compression. I tried bumping it with no joy and the exhaust made strange 'tshhh' noises.

Have now got it home and checked that the plug and it seems to be sparking ok. Tried bump starting it some more with G's help but it doesn't seem to want to go.



Anyone got any ideas what the problem might be?

Other than this it seemed to have been running ok. I've checked the kill switch, that it has petrol in it and I filled the two stroke the day before yesterday.
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[cagiva gezzer]

Seized? Holed the piston?
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"because one stroke isnt enough and four strokes waste two"

[Dusty]

I don't think it's seized because it still seems to turn over fine.

There might be a hole in the piston I guess it did get pretty damn hot, might also be the rings?

Was hoping somebody might tell me it was something less serious than this.
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[cagiva gezzer]

When they seize they still turn over as everything contracts back down.
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"because one stroke isnt enough and four strokes waste two"

[Dusty]

[killa]

Not sure how old it is but a gasket could have failed.

Or as said before seizure or the rings have disintegrated.
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Cleverly disguised as a responsible adult.
Bike:- Yamaha TRX850 | Killas Biking History | Killas Gaming History | Killas autmotive history

[Smoto Bob]

when you say it was getting very hot did you look at the temperature gauge on the dials? Sounds like you might have an auto lub problem or something as they tend to run for ever and ever if still resticted.

Should still start with lower compression if you have damaged the rings but they are only like £20 to buy new ones. Just check all the usefull things lean it over make sure the overflow s working/ reeds ect. ht lead

Good luck
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F'it DO WHAT EVER MAKES YOU HAPPY!!!!! Even if it screws over everyone else :p
Titz wrote: "..and my 3rd accident was when this police car....."

[Dusty]

[Smoto Bob]

If you lean the bike over really far fuel should piss out just means fuels getting into the carb . If it dont.. then start there

Auto lub, its just infront of the clutch cover theres the oil pump. Auto feeds the right amount of 2 smoke oil to the air/feul intake just before the reeds on your model. Would check that to make sure its working adjusted and getting oil if you do replace the rings ect(which it sounds like you need to do lol).

Just sounds like you rings have gone really, whip it apart and take it to shop. They shouldnt have don any damage to tha barrel so should be quite cheap as well,

Temp gauge, lol you got water in it (only useful gauge lol)
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F'it DO WHAT EVER MAKES YOU HAPPY!!!!! Even if it screws over everyone else :p
Titz wrote: "..and my 3rd accident was when this police car....."

[Dusty]

Cheers mate I'll have a look at it this weekend.

Asked in shop about rings and they said new piston with rings for £50 ??? Seems very cheap.
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[Smoto Bob]

na 50 is about right you can get a cheaper copy one if your realy hard up but wouldnt bother lol
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F'it DO WHAT EVER MAKES YOU HAPPY!!!!! Even if it screws over everyone else :p
Titz wrote: "..and my 3rd accident was when this police car....."

[J.K.R]

the heat could melted a hole on top of the piston or maybe one of your crank seals has given up the ghost and that would explain the smoking (gearbox oil being burned in the cylinder) Just a suggestion!

EDIT: didnt realise the smoke was coming from the head
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