Old 23rd August 2010, 03:43 PM #1
simpsonbandit simpsonbandit is offline
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simpsonbandit simpsonbandit is offline
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Wink 2002 yz 250 dilemma

hi lads

can anyone shed some light on this problem/ what i need to do to repair/ and where to get parts.....

I changed the plug and airfilter on my yz and went out for a few hours yesterday,she was flying not a bother but it was a bit smokey at first so i put more petrol in the tank to balance the petrol/ 2 stroke mix...and it was grand..
When i got home i looked at the bike and i noticed 3 things

the rubber clamp sleeve that seals the exhaust where front pipe meets the back pipe was loose...maybe the metal rings on the ends of the rubber pipe are worn?

also i noticed small drops of black oil type fluid up on the cylinder head just below where the spark plug sits???

also this black oily was dotted along the middle/rear end of the exhaust and on bits of the frame in the same area???

Any ideas???

Is it possible I put too much air filter oil on the air filter?

Anyone seen this before??

Thanks
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Old 6th September 2010, 02:51 AM #2
fastandy fastandy is offline
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Re: 2002 yz 250 dilemma

probably running far too rich!


need to look at your jrtting /needle position
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Old 6th September 2010, 05:02 AM #3
GaryMunster GaryMunster is offline
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Re: 2002 yz 250 dilemma

best to just leave it and hope it doesnt break
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Old 6th September 2010, 01:17 PM #4
shauncreed shauncreed is offline
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Re: 2002 yz 250 dilemma

Probably running too rich (my cr 250 runs nicely at a mix of 1:28, which means 1litre of fuel to 28 mili-liters of mix). Exhaust is probably just loose and the excess mix is spattering your engine. Do your mix properly and change the bungs on your exhaust (ebay all the way). Leave the jetting. If it was working fine before then thats not your issue. If you go messing with it then you will have problems!
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Old 6th September 2010, 06:30 PM #5
del86 del86 is offline
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Re: 2002 yz 250 dilemma

there should be a little bit of oil come out the pipe after running
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Old 10th September 2010, 05:40 PM #6
fastandy fastandy is offline
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Re: 2002 yz 250 dilemma

Originally Posted by simpsonbandit
hi lads

can anyone shed some light on this problem/ what i need to do to repair/ and where to get parts.....

I changed the plug and airfilter on my yz and went out for a few hours yesterday,she was flying not a bother but it was a bit smokey at first so i put more petrol in the tank to balance the petrol/ 2 stroke mix...and it was grand..
When i got home i looked at the bike and i noticed 3 things

the rubber clamp sleeve that seals the exhaust where front pipe meets the back pipe was loose...maybe the metal rings on the ends of the rubber pipe are worn?

also i noticed small drops of black oil type fluid up on the cylinder head just below where the spark plug sits???

also this black oily was dotted along the middle/rear end of the exhaust and on bits of the frame in the same area???

Any ideas???

Is it possible I put too much air filter oil on the air filter?

Anyone seen this before??

Thanks

is the bike new to ya?
or have you had it a while?
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Old 10th September 2010, 06:02 PM #7
gpman gpman is offline
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Re: 2002 yz 250 dilemma

imo you should stay away from the jetting if you dont know what your at if the bike is standard i always ran mine at 50 to 1 in english this means 5 litres of petrol to 100 millilitres of 2 stroke never had any probs if someone was at the jets and spark plugs before you got it you better find out what they did because the mix will be different to suit the spark plugs and jetting set up
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