The engine in the Hustler 3700
Fitment for the Hustler 3700 centres on the Shibaura N843: 1.1L / 69 cu in, 3-cyl inline, 75 x 85 mm bore x stroke, about @ 2600 rpm, Tier 3 & 4. Serial number on the block settles the exact version. New-surplus and rebuilt stock ships from Houston.