I would drop that gas/oil autolube device, since mixing gas to the fuel directly on the gas tank is more safe, and you know exactly how much oil is going in. If this autolube fails, then you can either have too much oil in your mixture, or even worse, no oil at all. Said that, put in a new spark plug (the one recommended for you bike) and give the carb a good clean. Try to find out what jets you are using, the position of the needle clip, and the number of turns (out from fully closed) on the air screw. After you find these out, then try to find your bike´s stock carb specs. While you are checking things, also check the condition fo the reeds, and the timing.
If your carb is way off from the stock specs, then try to reset things back to stock, and then you can start fine tuning it for your altitude/weather and gas.
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1992 YAMAHA WR500ZD, among others. |