You wouldn’t want to run an engine with old engine oil. That would be dangerous for the engine. Such a performance part would not come off cheap even if you were purchasing it second hand. Not to mention for the time period in which such an engine would work, it would utilize more patrol than usual. As you can see with just one lack in maintenance your over all cost on the vehicle increases. As far as ATV parts are concerned well it is impossible to make people stop buying second hand performance parts. The thing is that new parts are just too much expensive for everyone to afford. A second hand part has many disadvantages to it. For instance it would already be worn off at the time of purchase. If not well then it would pretty soon wear out. Apart from that a second hand part would never allow the vehicle to reach its optimum potential. Further more a second hand part could damage other parts of the vehicle as well.
There are ways in which you could find new performance ATV parts for a rather lesser price. You need to keep in mind that the price might be less but a second hand part would still be cheaper. One simple way is to use the internet and explore the local market. Apart from that you could purchase these parts from a whole sale shop.