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HZ is the regular version, and HZ-R is the version that carburetor has DRS system. The engine displacement is from 14.95 c.c. at 91 grade up to 17.17 c.c. at 105 grade. The diameter of piston is from 27.7mm to 29mm, and the stroke is from 24.8mm to 26mm, which means that not only the piston becomes larger, but also the crankshaft has changes to accommodate larger stroke. Furthermore, the carburetor also has big differences such as the large-sized inlet. 17.17cc 29.0mm 26.0mm 2000-16.500Rpm 3.8ps-15,000Rpm 608,4g FEATURES: Same mounting dimensions as a .90 cu in engine Machined blue anodized aluminum heatsink cylinder head Velocity stack increases airflow and enhances engine performance Backplate accepts the Futaba BPS-1 RPM sensor for the GY701 and CGY750 gyros Ideal bore and stroke ratio for lowest vibration
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