Question about 2003 Yamaha YZ 250

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Oil out of tail pipe

2001 yamaha 125 oil is coming out of the tail pipe

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I have a 2000 yz 125. just put a new top end on it after i changed the stock pipe to a FMF turbine core 2. I have exxissive black goo comming out of the tail pipe and it is hard to start after it dies. i am using a smokeless synyhetic at 32:1. I dont remember this problem to this extent with the stock pipe but memory fails me. Can anybody help.

Posted on Aug 21, 2009

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Hi,
This is not uncommon.
Things to check first would be your fuel mixture. You might be running a bit rich. You should be using a mix of 3.5 percent synthetic oil.
Being a 2 stroke, the tail pipe cartridge needs replacing from time to time, as it does collect oil with time. If the bike is a bit noisey change the packing.
Always remember that there is oil in fuel used on 2 strokes.
Lastly check the type of oil you are using. Mineral oil does tend to be a bit messy as the mixture requires around 5 percent oil.
Most off road stores now keep good LOW SMOKE oils such as Motrex.
Stick to good synthetic oils !
Cheers
Jon

Posted on Feb 16, 2009

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