Melting spark plug is too lean. exhaust gas high temps caused by too much air. your oil to fuel ratio is correct, but your air to fuel ratio is not. adjust your needle clip position to add more fuel to the carb by lowering the C clip. this will raise the needle, giving you more fuel for the same amount of air. also check air filter element for tears.
what about the air mix screw what would be a good setting for that?and what clip position do you recomend on the needle jet?and the filter is good its new.
Screw: bottom it out then rotate counter clockwise 2.5 turns. Needle: set clip on needle 1 position higher than it is now. Did you buy an air filter that requires oiling? if so, did you oil it?
correction: lower the C clip on needle to raise the needle height therfore adding more fuel.
yes i did oil the filter,and i will move the clip on the needle the air screw is already set to that thanks for the help hopefully this will fix it getting a little tired of buying pistons.
what plug gap should i use?
plug gap comes set from factory. But I will pull out the manual and let you know what it says.
0.5 - 0.6 mm gap
Raising the needle and playing with the air screw isn't going to fix this issue. Change the jets if you want to quit melting plugs and pistons. This is assuming you have premix in your fuel. 32:1 is the leanest I would suggest for a 125. I raced using 24:1 back when this bike was new (2003).
Adjusting the air screw alters the effect of the pilot jet - it won't increase the maximum volume through the jet. Adjusting the needle is a fine tuning thing - mainly for the mid range. Change the pilot jet and main jet. Go to your local shop and get their recommended starting point - this is the fastest way. If they don't have an answer, go to a real shop.
To check the timing, you need a dial indicator.
Scott
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Raising the needle and playing with the air screw isn't going to fix this issue. Change the jets if you want to quit melting plugs and pistons. This is assuming you have premix in your fuel. 32:1 is the leanest I would suggest for a 125. I raced using 24:1 back when this bike was new (2003). Adjusting the air screw alters the effect of the pilot jet - it won't increase the maximum volume through the jet. Adjusting the needle is a fine tuning thing - mainly for the mid range. Change the pilot jet and main jet. Go to your local shop and get their recommended starting point - this is the fastest way. If they don't have an answer, go to a real shop. To check the timing, you need a dial indicator.
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thanks for all the help!!
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