first banshee. needs rebuild. suggestions?

[Tommygunn]

i bought a 03 banshee today. i have been wanting a shee for about 10 years now but always rode tight trails so never bought one. now that i am riding the dunes a lot, i want to build it just for that (but also trail ride it). i do know it needs a top end rebuild. if i am going into the motor, i want to give it more power. what can i do? i am unsure what has been done to it. the guy said it had 68mm pistons? he didnt really sound like he knew what he was talking about but it does run good, just hard to start when its cold. doesnt have a lot of compression. not looking to break the bank, just rebuild it and give it more power at the same time. maybe 400cc or 420cc? whats required, how much will it run me? i want it to stay reliable but be much faster at the same time. looking for the best bang for the buck. any suggestions?

 

Thanks

Edited January 16, 2012 by Tommygunn

[bansheeman_05]

There are a ton of mods you can do to wake your shee up. You can get some aftermarket exhaust and reeds, put a timing plate and advance the timing, put a K&N on it, etc etc. Make sure you jet the carbs to your mods though so you don't end up with a mess. I am not positive but I think that 68mm may be the max bore you can get outta stock jugs. You will have to rip into her and see what you got for sure and go from there. Welcome to the HQ!

[Larry's Shee]

List your current mods. Befor you tear it apart do a compression and leakdown test. Have you tried cleaning the carbs? Checked the reeds? Both those items can cause hard starting. Look on any of the sponser sites and decide if a 421 will "break the bank"

[Tommygunn]

right now it has full system Pro Circuit exhaust, 35mm carbs and K&N filters. we are going to tear into the motor this week and see what size the pistons are. if they are NOT 68mm, we are going to go to a 68mm, port it, and get some dome heads and bump the compression up to 11:1. i've been looking into the 4mil cranks but i cant decide if it will be worth it or not. did a compression test and both read about 100psi.

[guns4children]

just go 4mil. if someone would have told me that when i first came here it would have saved me a few Gs

[Tommygunn]

just go 4mil. if someone would have told me that when i first came here it would have saved me a few Gs

 

well we tore into it and the top end was shot. the pistons had A LOT of play in cylinders. the port job that the previous did was pure crap. i ended up buying a stage 5 Trinity kit from a guy who never had it installed. i got Trinity cylinders that have been ported by Trinity, new pistons (65mm 0r 65.5mm, can't remember), trinity head with the domes, using a thinner gasket to bump up the compression a little more. should have around 12.5:1 compression. is this a good set up? total mods would be:

 

mods listed above running on 110

35mm carbs with k&n filters, no airbox

pro circuit exhaust

boyesen reeds

 

anything else i can do to bump up the power? what kind of power can i expect once we get it finished? is this going to be a good set up for trail riding and going to the dunes once or twice a year?

 

thanks