2004 yamaha blaster
 

I have installed a new wiseco piston on my blaster and rebuilt my carb but i just just dont feel that it drives right. I did put in new jets im not sure what size tho because my friend put them, do you guys know by any chance know what size i should put with the new piston besides that the blaster is 100% stock. Also it does not idle it just turns off when i stop giving it gas i am thinking it could be the jets or the throttle cable? Hope you guys can help.

You do not need bigger jets for the piston, you usually only need new jets when adding an aftermarket air filter and/or pipe. The idle problem could be the pilot jet is wrong or clogged

main jet-280