Help
- This topic has 1 reply, 2 voices, and was last updated 9 months ago by
.
-
Posts
-
-
hello, I have a hyosung gt125r 2006, and I want to change my cylinder with a 250 one, and I would like more information about this, if it works in the main, if I have to change the cylinder head as well, the one I have now of 125 works , or should the valves on the 125 cylinder head be changed with 250 valves?
-
Hey. The 125 crank cant support 250cc pistons because extra volume the cylinder makes and extra hp will snap the crank and conrods.
The 125cc cam chains are too slim to spin 250cc camshafts (they use chains that are 2-3x wider and stronger) the 250cc cylinder head also has much stronger springs causing more strain on the crankshaft.
You can however fit some better HD clutch plates and upgrade to 520 chain kit to customize gearing.
Any mods on your 125 cylinders should be *slightly* custom stronger 10% extra valve springs , port polishing , maximum 64-66 piston big bores (custom, i have no info on this as not one really does this) , head skimming. Thats about it for the valves and cylinder heads that way the 125cc crank wont snap away.
// Meditation doesn't mean you have to sit still....
-
Hyosung gt125r
- You must be logged in to reply to this topic.