Yamaha Billet Head Domes

Our Yamaha Billet Head Domes are manufactured from 7075 aluminum alloy which is much stronger than standard 6061 series alloy.  We also have a unique combustion chamber design that positions the spark plug closer to the piston enhancing the efficiency of combustion thus increasing power.  Domes are available in 31cc for standard bore to second over and must run on 100+ octane fuel.  The 35cc standard bore dome would be the choice for pump fuel.  If running an 85+mm bore the domes are available in 35cc and 39cc respectively.