The ADA Racing Billet Heads for the Yamaha 701 are made from 6061-T6 aluminum and CNC machined for consistency and performance. This head uses the stock head bolts and is clear anodized for protection against corrosion and feature dual water outlets for additional cooling. Head shell includes o-rings that fit into the grooves in the head shell and brass fittings. Head shells are available in standard or girdled version for those running higher compression and looking for extra insurance. The girdled version requires the girdled hardware kit sold separately. Multiple dome configurations are available to tailor to your specific engine needs. Two domes are included with this kit, additional and replacement domes are available separately. 

NOTE: ADA Racing optional pipe bracket available for exhaust systems that mounts to the head like the stock 3-bolt exhaust. 

ADA YAMAHA 81MM BORE DOMES
Billet dome has .005” squish relief at 82.5mm (fits up to 83mm piston) with a 4˚ angle.

YA2137L - 37cc 170lbs/91 Octane
YA2135L - 35cc 185lbs/91 Octane
YA2134L - 34cc 192lbs/95 Octane
YA2133L - 33cc 200lbs/100 Octane
YA2131L - 31cc 215lbs/110 Octane
YA2129L - 29cc 230lbs/115 Octane

NOTE: 35cc Dome for 100 Octane with Dry Pipe