Stock 103 piston/head upgrade???
#1
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
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
#4
#6
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
#7
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#8
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.
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