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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
1999 Yz125
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[QUOTE="Rich Rohrich, post: 1469758, member: 16241"] Oil dripping out of the silencer is a consequence of another problem not cause of your bike not running right. If the bike is jetted too rich, or the ignition/sparkplug has an issue oil will end up in the silencer can because the fuel isn't burning properly. Get a Yamaha service manual and start with the basics. Clean fresh fuel with the proper amount oil mixed in. Clean the carb to make sure all the jets are doing their job and check the float level. Pull the silencer and repack it, if it's full of oil then it can't do it's job. Put in a new properly gapped spark plug and make sure you a verify there is good spark when you kick it over. Check to make sure you have the right amount of compression. Verify the oil from the transmission crankcase isn't getting sucked into engine because of a bad seal (very low oil level in the trans is a clue that the seal is bad). Check and clean all the connections and grounds in the ignition system. When they get dirty or corroded bikes don't like to run. The manual will have a troubleshooting section you can follow if these things don't help. [/QUOTE]
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Forums
MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
1999 Yz125
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