Re: Engine upgrade
To answer your question directly, bigger valves are expensive and not necessary for just normal driving and/or touring. The easiest and cheapest route to more power are higher compression and a bigger carb. Both changes can be done now or later, easily. If I were you, I'd put in a B or very mild touring cam now, and make changes later if you want. Your present cam is likely worn and should be re-ground anyway, now is the time to do that.
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