hi, i just got a 96 ninja 250 with 3900 km off my boss. im new to bikes, so here are the qustions.
1, what grade oil should i use?
2, can stock carbs be rejetting? im making a custom exhaust for it. mostly for looks since the bike is slow as hell no matter what u do on it. but i'd like to run it a little rich so i dont melt the valves with a shorten pipes