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Yamaha DT 125 R won?t start

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culpan
Renault 5 Driver



Joined: 10 Jun 2004
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PostPosted: 18:09 - 07 Mar 2005    Post subject: Yamaha DT 125 R wonít start Reply with quote

Hi people,
I have recently bought myself a DT 125R 03 model but I am having trouble starting it. It is second hand with only 400 miles on the clock but the guy I bought it from had not used it for almost 3 months and has just been sat outside under a blanket.

For the first couple of days it was running ok and did a few miles to try and blow some of the crap out the exhaust (which landed on my shiny wheels) but it didnít like being revved much nor did it go well in first or second gear.

Now it has given up all together it cut out on me for no reason yesterday, so the spark plug came out which was all oiled up so was cleaned and it would idle at just over 2k for a few minutes then would die again. I think it mite be something to do with the jetting but the problem is that I donít have a service manual or anything so am unable to try and find the problem.

Donít suppose any one knows whatís up with it / how to fix the problem?
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craigT19
Jolly Green Giant



Joined: 09 Feb 2002
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PostPosted: 20:42 - 07 Mar 2005    Post subject: Reply with quote

the jetting will always remain constant so i wouldnt think it would be that, try de-coking the exhaust as u said your self it hasnt been run "hot" for a while.

All the best
____________________
Yamaha factory trained mechanic

Crying or Very sad in memory of pops. sadly missed Crying or Very sad 1945-2003
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mr jamez
World Chat Champion



Joined: 04 Aug 2003
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PostPosted: 20:47 - 07 Mar 2005    Post subject: Reply with quote

If it has been sat for 3 months the petrol might have gone off, and if there was still petrol in the carb then it might have turned into a gummy mess, perhaps consider stripping it down and giving it a good clean. Have you tried a new spark plug? check that there is a big fat blue spark as well. Also a compression test may be in order just to check the top end is OK.
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Scooby
Scrappy Doo



Joined: 26 Mar 2002
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PostPosted: 20:50 - 07 Mar 2005    Post subject: Reply with quote

Clean the plug up and get the bike running, then go and thrash the tads off it. It has done 400 miles so is more or less run in so don't worry about that too much. Just go and thrash it, 2 strokes need to be thrashed. Once you've given it a good thrash it should run okay, so then drop the oil and it should be fine.
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culpan
Renault 5 Driver



Joined: 10 Jun 2004
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PostPosted: 23:35 - 07 Mar 2005    Post subject: Reply with quote

Ok cheers guys will give all them a go and let you know how it goes. Thumbs Up
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Frost
World Chat Champion



Joined: 26 May 2004
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PostPosted: 00:49 - 08 Mar 2005    Post subject: Reply with quote

Fresh petrol and 2 stroke oil would be first one the list. Gearbox oil would be worth checking along with a new spark plug.

Provided the bik isnt drinking coolant etc, then the only likely problem would be the powervavle. If it is jammed open, closed, or in backwards it would cause performance issues.
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