The 300 Ninja is actually cheaper than I thought it would be at around $6000-$7000, If someone is outlaying that kind of money for a 250/300 then doing cheap mods are not really recommended & would not be good with any kind of warranty claims
http://www.kawasaki.com.au/news/general ... -availableSome basic mods with any new bike is usually removing any kind of restrictors in the air filter box & possibly in the exhaust, They would be the first basic cheap mods, But for something as small as a 300cc it would need maybe an exhaust & possibly a retune
You would be better off going for a 600 if you need more power, Probably not much heavier feeling to ride
If you have already bought a 300 you might want to look here>
( GIYF )
https://www.google.com.au/search?q=kawa ... 67&bih=471http://www.kawasakininja300.com/forum/1 ... fications/