Two strokes last a long time.----Most end up on the scrap heap because of mistreatment / mistakes made by owners.-----Ever see a jet skier in operation ?----near constant idle to full throttle all afternoon long.----I call them ----" bumble bees "
A 50 year old motor.----Some will argue.----Step #1 is a compression test.----Post the actual values here.----Then test charge coil and sensor coils with your ohmmeter.