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has this machine been sitting for a while if so deffinatly clean the carb. i cant help you much with the adjusting part sorry but if you take the carb apart before removing any adjusting screw count how many turns it takes to seat the screw then just put it back to that setting when finished cleaning. most will have an idle air adjustment for fine tuning idle and low end performance make note of how many turns it is out if the pilot jet is correct between 1 and 2 turns out will generally be were it is when adjusted correctly. if you find its out much more than that you need to check the spring under the screw that keeps it from backing out and/or the size of the pilot jet. the exhaust problem deffinetly needs to be addressed. a 2 stroke relies heavily on the expansion effect of the exhaust system to scavange exhaust from the cylinder. with out a properly functioning exhaust the spent gasses have a hard time escaping the cylinder good luck let me know what you find
 
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