Without admitting addiction <g>, I currently have two of the three engines in the 17 series--the B and h&m. Jin’s first 17 was designed with a simple needle-valve carburetor, pushrod-controlled exhaust valve and atmospheric intake valve. Next was the 17B with a throttle-carb and pushrods controlling both the intake and exhaust. The latest 17 jewel is a hit-and-miss. As the vid shows, the h&m does nicely hit and miss. The softer-spring/s mod common to the larger M90 engine should also slow down the 17, if that is a concern. If you have a lathe, turning shoes for the flywheels should add enough weight to slow it down as well.
The 17’s have been easy starting and very reliable runners.
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