Ok, first the boat... 1984 Rinker V170 powered with a 2.5L 120 HP I/O, max RPM is 4300. I believe the stern drive unit is a Alpha One (can anyone confirm or deny?) the gear ratio is stamped 1.98R. Dry weight is 1700, typical "wet" weight is ~2550, the boat is used for cruising/tubing/occasional skiing
The problem(s);
When slowly throttling up from idle it will sputter and die around 1500 RPM. If I go from idle (in gear) to WOT it would stumble around 1500, almost die, and then pick up again. I have replaced the plugs (properly gapped), replaced the fuel filter and set the timing/checked the advance (8* @ 700 RPM in gear, 37* @ 1900 RPM). The points have been switched to electronic ignition by a previous owner. I believe a carb rebuild is in order...
When I got the boat it had a 15 1/4 x 21 prop, it had trouble coming out of the hole with a total weight of just under 2200 pounds. Max RPM was 3600 (trimmed for max RPM). Max speed was 35 (according to the dream-o-meter)... it would take it a good minute or so to come on plane...
Today we swapped on a 14 1/4 x 17 to try tubing behind... we were loaded to 2700 pounds... it still had trouble coming on plane... But it was better than the other prop @ 2200... With the boat at 2500 pounds and another 200 on the tube max RPM was 3200 (trimmed for max RPM). I don't remember looking at it before we through the tube out... Max speed is unknown because the dream-o-meter went on strike today...
After we had been running around for a bit today, the engine started to get a little warm (160*, it normally runs 110 with a new thermostat) so we put it to an idle until it got down to 140* then shut it down for about 10 minutes (extended cigarette break) then started it up... Temp was back to normal, so I put it in gear and slowly accelerated to 1000 RPM (no tuber) once it got to 1000 I put it wide open (to avoid stalling @1500) it started to accelerate, at @2000 I heard a *POW* then the engine free revved until I cut the throttle (about 4000 RPM)... At that point in time I had no forward or reverse...
My first question is where do I start to look for the source of this "pow" so I can get it mobile again?? Once I get that fixed it will be getting a carb kit (assuming a compression check comes back normal)...
The problem(s);
When slowly throttling up from idle it will sputter and die around 1500 RPM. If I go from idle (in gear) to WOT it would stumble around 1500, almost die, and then pick up again. I have replaced the plugs (properly gapped), replaced the fuel filter and set the timing/checked the advance (8* @ 700 RPM in gear, 37* @ 1900 RPM). The points have been switched to electronic ignition by a previous owner. I believe a carb rebuild is in order...
When I got the boat it had a 15 1/4 x 21 prop, it had trouble coming out of the hole with a total weight of just under 2200 pounds. Max RPM was 3600 (trimmed for max RPM). Max speed was 35 (according to the dream-o-meter)... it would take it a good minute or so to come on plane...
Today we swapped on a 14 1/4 x 17 to try tubing behind... we were loaded to 2700 pounds... it still had trouble coming on plane... But it was better than the other prop @ 2200... With the boat at 2500 pounds and another 200 on the tube max RPM was 3200 (trimmed for max RPM). I don't remember looking at it before we through the tube out... Max speed is unknown because the dream-o-meter went on strike today...
After we had been running around for a bit today, the engine started to get a little warm (160*, it normally runs 110 with a new thermostat) so we put it to an idle until it got down to 140* then shut it down for about 10 minutes (extended cigarette break) then started it up... Temp was back to normal, so I put it in gear and slowly accelerated to 1000 RPM (no tuber) once it got to 1000 I put it wide open (to avoid stalling @1500) it started to accelerate, at @2000 I heard a *POW* then the engine free revved until I cut the throttle (about 4000 RPM)... At that point in time I had no forward or reverse...
My first question is where do I start to look for the source of this "pow" so I can get it mobile again?? Once I get that fixed it will be getting a carb kit (assuming a compression check comes back normal)...
