Mauro have released some new Valvola .21 parts. It's a new induction system with a reversed drum intake that shoots the fuel up directly to the ports. The crank shaft is balanced to. The drum seemt o have the ramp plug in aluminium and the over all weight of that unit seems to be much lower then the stock heavy drum. There have only been one batch produced so far for the counter rotating gearbox "V" motor but it will most likely be available in the direct drive motors also by 2010.
LINK to the German forum where I've found the pics and info.
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