Which Big Bore kit should I get??

[exkid300]

I have a 300 ex and i was just wondering which big bore kit should i get?? the 330 big bore kit or the 390 big bore kit. Im gonna be useing the bike mainly for long distance riding and sumtimes racing but I need a durable bike.. which size 330 or 390??? both of the kits are on fourstroke tech.com.. Thanx

[underpowered]

i would say the 330 will be more reliable than the 390. the 330 is a nice improvement over stock, i dont think you will be dissapointed with a 330.

[humblesquirel21]

id vote 330 from everytihng i have heard