Aside from borekits like MTRT, TWH, SUN why not add this 4 valve cams Head on your Yamaha MIO. As far as I know it would be better if you upgrade your Bore, A big valve is also a must for upgrade. I’ve read from scooter forums that in order to attain the capability of your upgrade it would be better to have this both upgrades done side by side.
So here on my pictures collected from sir MONXJL, by the way his also selling this parts.It’s a 4 valve , FLECHE Head assemble.
Feast your eyes on this wonderful upgrade. Price is not available. You can post your comments and inquiries below.
Pictures courtesy: monXJL