Everything is fine with the bike except for 2nd gear, when i open the throttle all the way i start to sputter as it accelerates, all the other gears are fine

Open throttle, in gear engine builds up revs but road speed drops, especially up hill; is a slipping clutch.

does it take off in 1st

the problem is not your tuning, it is your clutch. Motorcycle clutches are maintained as light as possible to stop heavy pressure on your fingers. often when you increase hp, you must increase your spring pressure on your clutch plates so the first thing is to adjust your clutch, if it is too tight it will slip under load (more load = more slip). second,clutches do wear out so if adjusting does not work you will have to inspect your clutch plates for wear and may even have to increase your spring pressure, this is a big job and you will need special gear to do it

dirty throttle body, check air filter.

2nd gear is bad and so are you shift frok

if it has a kick down cable that could be the problem look for a cable running from throttle to trans that can be adjusted in length

Sounds like you are having a problem with the fuel injection on it. Take it to the dealer.

check your fuel pump and filter,filter may be dirty ,fuel pump may not be pushing anough presser,or your pressure ragulator my be leaking

Hello, wheelies mm not good for your gearbox or clutch, 1st off is the gearbox working OK, does it jump out of 2nd gear under hard acceleration? then we can move on from this point,
Ian