I have a 1988 Johnson 110h.p. VRO on an 18 foot Crestliner aluminum bowrider. My prop is a 14x17. Top speed is 32 m.p.h.(GPS) and the highest rpm's I can achieve is 4900. I have checked compression and I am getting 95 on (3) cylinders and 89 on (1) cylinder. I am using new Champion QL77JC4 plugs...
