We just got the new GTM CNC forged weight matched 820cc pistons. These are drop-in, meaning no crank re-balancing required. Dyno info posted below.
We'll try to keep a set in stock. Click on the pic below or HERE. Yes this will require my ECU Flash Tool for a corrected map, or if you have purchased one already, map update is free with piston purchase from us.
You can have your cylinders bored and re-coated yourself, or I will try to offer a core exchange at additional cost of course.
Porting: For those who have asked, unlike the heron heads, the stock Mk III hemi cylinder head casting/porting is actually quite good, and not worth any effort to try and maximize them. Not saying small gains can’t be had, but cost wouldn’t be worth it... point of diminishing returns.
Contact me direct for more info direct email; Info at GuzziTech.com
Forged and weight matched 820cc piston on left, stock cast on right:
Dyno graph below... Same bike, bone stock 749cc (green tracers) vs. GTM 820cc (blue tracers). Both are with stock exhaust and small amount fuel tweaking. See below for the GTM 2-1 and fuel tweaked.
V7 III GTM 820 w/GTM 2-1 exhaust:
We'll try to keep a set in stock. Click on the pic below or HERE. Yes this will require my ECU Flash Tool for a corrected map, or if you have purchased one already, map update is free with piston purchase from us.
You can have your cylinders bored and re-coated yourself, or I will try to offer a core exchange at additional cost of course.
Porting: For those who have asked, unlike the heron heads, the stock Mk III hemi cylinder head casting/porting is actually quite good, and not worth any effort to try and maximize them. Not saying small gains can’t be had, but cost wouldn’t be worth it... point of diminishing returns.
Contact me direct for more info direct email; Info at GuzziTech.com
Forged and weight matched 820cc piston on left, stock cast on right:
Dyno graph below... Same bike, bone stock 749cc (green tracers) vs. GTM 820cc (blue tracers). Both are with stock exhaust and small amount fuel tweaking. See below for the GTM 2-1 and fuel tweaked.
V7 III GTM 820 w/GTM 2-1 exhaust: