2003 Yamaha YZ 125 "pilot light jet gas fired" Questions

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Question about Yamaha YZ 125 Motorcycles

1 Answer

...pilot screw 1/4 turn counter clockwise. Check the float level. Before putting the slide back in the throat of the carb, move the clip on the jet needle one notch lower.Put the rest of the carb back ...

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Question about Yamaha YZ 125 Motorcycles

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...pilot jet usage due to an accumulation of fine particles in the fuel which build up and block the pilot jets. Above about 3000rpm, it runs on mains jets. If this is the problem, you can use a high ...

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Question about Yamaha YZ 125 Motorcycles

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...pilot jet. This thing ran great all last summer and now in not even 200 miles this year it's not rideable. Backfiring out of the exhaust is usually an ignition problem. Unburned fuel is getting ...

Question about Yamaha YZ 125 Motorcycles

1 Answer

...light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your ...

pilot/slow jet, and throttle slide. 3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle. 4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet. 5. 3

Question about Yamaha YZ 125 Motorcycles

1 Answer

pilot/slow jet, and throttle slide. 3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle. 4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet. 5. 3

...light through each one of them them. Put things back together and go for a test drive. That's a loaded question and the answer is as vague as the offered details - it needs a tune up. I'll make the ...

Question about Yamaha YZ 125 Motorcycles

1 Answer

...pilot jet and related passageways are cleared. < < READ CLOSELY > > Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two ...

Question about Yamaha YZ 125 Motorcycles

1 Answer

...pilot jet area. < < READ CLOSELY > > Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in ...

Question about Yamaha YZ 125 Motorcycles

1 Answer

...pilot circuit is clear. You will need to pull the carb and clear the idle circuit. While the carb is out, move the clip on the jet needle down one notch. Two may be needed but start with one. ALWAYS ...

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