o1 yz 125 will not stay running
Posted July 17, 2007 - 06:06 PM
Posted July 17, 2007 - 08:51 PM
Posted July 17, 2007 - 10:02 PM
Posted July 18, 2007 - 06:02 AM
Posted July 18, 2007 - 06:31 AM
Posted July 18, 2007 - 07:30 AM
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Posted July 19, 2007 - 06:31 AM
Posted July 19, 2007 - 04:35 PM
A. Is there gas in the tank?
B. Is the gas flowing into the carb? Pull the gas line and check.
A. Is the spark plug good? Are you getting a nice strong spark? Is it weak?
B. If the spark is weak, remove the cap and push the plug right into the wire itself. Is it still weak? If not you've got a bad cap. If it is you might have a bad plug or something wrong electrically.
3. Pull the air-cleaner and run it in the garage TEMPORARILY without it. Does it suddenly run better? If so, clogged air filter. DO NOT RUN THE BIKE WITHOUT THE AIR CLEANER FOR ANY REAL LENGTH OF TIME.
4. Carb. Crack the float bowl and make sure it's got gas in it. If not it's clogged. If its over-flowing then it's got something else in the carb clogged. With the bowl off let the floats down, does the gas flow? If not, something is clogged. If all of these look ok, then you could at this point pull the carb off and give it a real cleaning just to be 100% sure.
5. Start tracing wire. Make sure nothing is cut or a wire is hosed. You can also pull out an Ohm meter to test the different parts (Rectifier if so equipped, Coil, stator etc).
Those are the top 5 and the order I personally use to do quick troubleshooting with running problems. Since yours may be an under-load issue, it could be any of the above. Is it the MINUTE You put it in to gear or will it rev in gear fine on a stand but dies when you sit on it?
Posted July 19, 2007 - 06:47 PM