dont do anything aftermarket to the exhaust or intake without rejetting, let more air in, or out = more fuel, always use a good 2 stroke oil, most of us mix at 32:1, but i ran the injection for over 8 years on my 96, and never needed rebuilt, just use good oil, keep your air filter clean, depends on how dusty it is where you ride, possibly once a week in bad dust
change your tranny oil often, once a month in the summer?? with good 2 stroke tranny oil, and always, always, always warm it up good before riding it
just my try'd and true, make it last long, rules