The 1987 model year, now absent the three-wheelers due to the CPSC ban, saw the engine receive a five-millimeter longer connecting rod, accompanied by a piston with a wrist pin bore raised five millimeters.
The 1987 model year, now absent the three-wheelers due to the CPSC ban, saw the first major upgrade to the Fourtrax. The engine received a five-millimeter longer connecting rod, accompanied by a piston with a wrist pin bore raised five millimeters.