madmikesmech wrote on 08/31/18 at 13:47:59:Hello Michael,
Just saw this post,will this piston add loads of Xtra power without a better cam? I'm currently running a jetted up stock carb, Yamaha RaptorPC, and a Jardine turnout exhaust, and of coarse th he Versy cct
YES.
They are 10.5:1 pistons just like the larger bore versions and WILL add punch regardless of other mods you may or may not do. Just pull out the stock piston and do a good fresh hone, clean it good, and install the pretty shiny Wiseco. Yea, you do need to put the cylinder and head and stuff back on, that does help. 😂
Then go ride. You can hear the difference in the exhaust, a new crispness in the sound, and feel it in the power pulses when the cylinder fires.
Hold your hand behind the muffler when you rev the engine and feel it in how the exhaust pulses are pushed out with more force.
A break-in of about 100 miles or so, riding normally and occasionally cranking the throttle to wide open for a second or two and let off and go back to cruise. This forces the pistons against the cylinder walls and encourages a good “seating” between rings and cylinder.