Good motor monitor your plugs(tan-like perfectly roasted marshmallow) for proper jetting to keep from burning down.Check all the grease fittings,check chain case lube,brake fluid res,belt height at secondary should be barley above sheave.Check Bogey wheel bearings for ease of motion,if they fel gritty get some new bearings for them,Proper track tension.I believe there is an online manual for all the specs
mine is relatively stock accept for clutching,so pretty tame compared to vmax4.I like this for reliability as I cant afford to rebuild the motor