There are different pumps that fit.------The only thing I would do is a new diaphragm if inspection shows it is bad.-----What do you mean by---" tune up "-----Electronic ignition , timing that does not change and fixed jet carburetors.---Makes a traditional tune up a thing of the past.-----Most important thing is a compression test.----Post your numbers here.
Spark plugs, rebuild carbs, and rebuild fuel pump. From what I read on 2 strokes of the carbs are not functioning 100% they will run rich and you won’t get the correct amount of oil in the motor
