Yes, maybe half of that, but only way to know exact amount of current/power is to measure it with accurate multimeter from bike, what is running normally.
Smoothening around valve guides??? Here porting means, that they make just better angles to valve seat surrondings. They "CAN also" smoothen and add more material to some places inside chanals, but mainly porting is making better flow to valve seats, when valve starts to open!!! Maybe we think little another way of that "porting"... I heard this from guy, who make engines for dragster cars and have very good tools for modifie heads/inlets, valve seats, equipments to measure flowing / cam timing, dyno, etc...So, i trust him with these things. He ported my 907 heads and he only little smoothening chanals, but concentrate to valve seat angles deeply. I am 100% satisfied to his work.
Btw, what chip You had with Conti 2-1 system ???? If original, then i wouldnt be supriced, if exhaust valves/seats were damaged. That Conti system is VERY open and need surely richer mixture...
As can see, i have started to smoke cigarettes...Btw, not so bad idea to put new guides same time as valve seats.
One reason to wear seats can be really wrong material what cant handle these new fuels. Those 907 times, this unleaded fuel was quite new thing, so it CAN BE, that they tested many seat materials in factory... some were good and some were bad..maybe!
