I have an '88 230 quadsport. It is bored .30 over, it has a K&N Air Filter and a Cobra Jet Pipe. It still has the stock jetting. I was wondering if it is to lean? What is the stock jetting? And if it is to lean how can I rejet the carb to make it not to lean or to rich.
Thanks in advance.

stock jetting? Don't know take it apart.
Any time you increase the air flow you should
re-jet so you don't burn it up. Air screw=idle(off gas/ backfires), Jet needle clip=midrange(top slot is leanest). Main jet=full-throttle. Go up one size until it burbles then go down one or two sizes.
Check plug.