SOURCE: i have a 1992 yz125 im getting good spark and fuel
Your spark should be a fat blue spark. Do a compression check, as it should get at least 100 psi or more, and do it with the throttle wide open. Make sure the air filter is clean!
Testimonial: "thanks "
SOURCE: 1988 yz125 air fuel mixture screws where are they
all thats been set at the factory--only thing can ajust is idle speed--the jets or float level may hav issues and the magneto cud be weak at kick
SOURCE: my bike wont start
Hello and happy thanksgiving.
As you must know the fuel injection on this is electronic, the fuel injector is turned on and off very quickly by the computer control module referred to as the "ECM" to supply a metered amount of fuel to the engine as needed based on the inputs from the various sensors such as the throttle position and other sensors, this is called injector "PULSE" to check and see if your injector is pulsing you will need to buy a little tool called a "NOID" injector tester, it plugs into the injector connector and when the engine turns over the Noid will flash very quickly. Also you have never mentioned whether you have had the ECM (computer control module) tested for fault codes, when it senses a problem or a sensor that is out of normal range it will record a code for this fault. You will need the factory tool (called a scanner) to do this test it is essential that this test be performed or more wasted money can be spent on replacing perfectly good parts. You can buy a Noid tester from any auto parts store like NAPA, just make sure your bike has the standard BOSCH fuel injector connector, it the connector is a different design then you will need the factory tool.
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