Question about 2003 Yamaha YZ 125

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My yz 125 made a loud popping noise when i tried to kick it up now it wont start any suggestions

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They can do this from time to time. What can happen is the expansion chamber gets pumped with fuel vapor and then can be ignited, causing a large backfire. I hate to attempt to answer your question with a question, but how old is the piston and ring? A ring won't last very long in a 125. For racing, it's changed every race. For joy riding 15-20 hours of run time and it's time for a ring at least. Weak compression can make it impossible to start. If you have perfect compression the cause for the non-start could be something as simple as a burned up or fouled spark plug.

Start by re-ringing the motor (you can do this for about $25 inside of 2 hours time). Clean the carb out, clean the air filter, fill the tank with fresh fuel and replace the spark plug (NGK B9ES - from Autozone for $1.89). If the bottom end of the engine is good, the above steps should get it fired up - providing your ignition system is good, and based on the apparent backfire, I would say you have spark.

Scott

Posted on May 17, 2011

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SOURCE: my yz 125 made a loud popping noise when i tried

Try putting a new sparkplug in could be fouled out. loud pop was just a back fire.

Posted on May 18, 2011

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