IMO anytime you buy a bike you should clean the carbs. Check the jetting, do a leakdown test and put new plugs in so after riding for awhile you can see how the plugs look. Some people use 32:1, 40:1 or I think I've seen people use ams oil at 50:1 if I'm not mistaken. Depends on the oil. Most applications are 32 or 40:1 for the most part