With the full crank motor big end ,I saw someone saying this fits HK1616F - NTN but haven't tried one.
The later full crank can be fitted with a power Torque conrod and big end / small end bearings and piston.
The G3 ,I've had a few if there is the slightest kink in the snorkel the engine losses power ,probably the restricted air flow changes the air fuel ratio too much and most likely is why later models had a plastic coiled intake pipe like on a vacuum cleaner.
The G4 can be fitted to a G3 motor if you make a spigot.
