banshee tuning question

[daygoslow]

i recently killed my banshee on a trail ride with some friends so i finally had to break down and get everything together for a rebuild. while doing so a friend of mine offered to make a me a deal on his top end off of his banshee since he was about to put his race motor on that frame. the top end has maybe 2 hours on it and it was priced right. now to my actual question after my ramble. my new set-up includes a stock set of cylinders that are full race ported (not triple ports) with 68.5 mm pistons.
i am trying to establish a safe baseline to start tuning from. in memphis i am at approx. 350ft above sea level, i am running the airbox with lid, snorkel removed (of course) k&n and pro-flow adapter with stock carbs. what main jets should i start with 320? 340? what needles at what position? i know the air box and lid are power robbing but when i ride in the woods with my 4x4 friends the air-box and lid are added insurance in the water and are help full for a little extra throttle response. any guidance or suggestions would be appreciated.

thanks
Donald

[ASRBanshee]

Hey I have the same setup and running needles 3rd groove 30 pilot and 300 mains
I think that is a good starting point if not perfect

[dajogejr]

It has full porting and you're running a full airbox AND Lid? Let that thing breathe...

You sure they're 68.5mm pistons and not 66.5? 68.5 is big bore sleeves AND a bore...

With an airbox and lid, 27.5 pilots and 300 mains should be plenty, will probably end up with 280s.

I have to be honest, you have a motor ready to go and you're choking it with stock carbs and a lid.

If you can, get 28mm or 30mm carbs, and get K&N lid or outerwears lid to keep the gunk out... You're robbing the engine of performance....just my .02

[bshee]

ive never messed with or even really seen the k&n lid but im using the outerwears lid and an outerwears prefilter...if you got fenders an unless your playing submarine you could get away wihtout the air box lid...