Custom patriot and webra 120
I've not been inside a Webra 120 but it sounds like it was designed to be as slow and weak as a 4 stroke 120.
With the mods I've suggested, It will definitely make power at 16K RPM however as Jeremy has suggested there may be design limitations that prevent this from happening. Such as:
1) Connecting rod too weak
2) Ring too heavy causing ring float
3) Insufficient transfer flow area in the crankcase
4) Too small a crankshaft ID for fuel/air charge at high RPM's
If none of the above are true; It could definitily be made to scream.
If any of the above are true then you need to look for another engine because no 2 stroke is going to give you the power to make that big Patriot fast below 14K RPM.