Stock 103 piston/head upgrade???
 

I have a 2011 SG, SE h/b, Fatcat, S&S HP103 cam, Evolution 30 tooth compensator, and a Energy One clutch with SE high performance spring.

I want to change out the stock pistons and go with a higher compression piston in hopes that I can gain more torque and hp. I don't know which manufacturer to go with or how hot it will make my bike run. Need advice on that.

I also know that in order to gain more power I need more air. So I'm considering going to a 58mm throttle body. I hear S&S Throttle Hog is the way to go but need some more info. I've seen 58mm kits on Ebay for 600+ but looking to save a few coins if at all possible. Need advice on this too.

SO this off season its either going to be throttle body and pistons for a quick fix. Or just some major head work and build around that as time/money permits.

Looking forward to hearing everyones comments, thanks

Can raise compression by going to a thinner head gasket I believe.

Headwork will get ya more than pistons and/or throttle body. In fact a bigger throttle body is a complete waste without headwork.

you are going to do head work, pistons and 58MM TB to get well into the 100/100 club

from the looks of the stuff you have already you should already be pretty close

Neggy the cam and the other two components got me 105hp and 113 torque.

Oldhippie so doing just headwork is enough and I won't lose the current performance??

I think a 58mm TB is too much for a 103, 50 should be plenty big, but as long as the air can enter and exit fast enough the better. I have a 10.5-1 with MVA heads, 50mm TB, 585 cams, Arlen Ness inverted AC and Supertrapp 2:1:2 stepped headers with X pipe and 26 discs each, and its making 124/121

Headwork

Those are some "happy" numbers... Ya won't get more without headwork. Ya can bump compression milling the heads along with port/valve work. Good head guy can clean up your stock intake too.

thanks guys

www.automotivemachine.com they have very nice heads.