Question about 2003 Yamaha DT 125 R
The first thing to do is get a new stock spark plug. Hook up the plug wire then have someone kick the lever while you hold the metal side of the plug against the bare metal cylinder head looking for spark while the starter is being kicked. If no spark is seen, find out why. Use a meter to check the handlebar and side stand switches for proper operation. How good is the battery? Are there any wires abraded or disconnected? Has the pulse generator, coil or CDI gone bad?
If spark is present, Be sure the air cleaner is clean. A dirty filter restricts the air the carb needs. Okay, you have spark and you have air, now you need gas. Start by draining the carb. Condensation from the gas tank can get into the carb float bowl and build to the point the carb is feeding only water into the engine. Engines don't run well on water. When starting the bike, do not go nuts with the throttle. Every twist on the throttle sends a shot of gas into the engine. Too many twists can flood the engine. Your bike is water cooled. Good gaskets/seals are needed on the cylinder and head. At this point we will assume the coolant system is not leaking.
Posted on Mar 22, 2011
Testimonial: "thank you so much for the advice, ive checked everything that you've mentiond on ur list, but it is still not starting, can u sugest anything els.thnx"
Check your ex it ma be plugged coment on bike nothing to do with spark I did not give any info on spark matter just why it might not run and rev.
Posted on Dec 18, 2011
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Posted on Jan 02, 2017
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