1) Performance issue you are trying to correct.
trying to get boat to plane out with friends aboard approx 300-400 lbs more with added weight top speed 13 mph wontget on plane tried having everyone sit in back and in front started with motor trimmed almost all the way in and played with trim a bunch. getting a bunch of splashing up front but wont finally get up on plane. also put a super screamer tube behind with 4 adults 1 kid (1 of adults on tube) and max speed was 12.5 mph. rope seems to drag in water a bunch since i only have transom mounts on either side of engine to attach to and they are only like a foot off the bottom of the boat.
2) Current prop manufacturer, model, aluminum or stainless as a minimum.
-quicksilver aluminum qa2034x 13.75 dia 15 pitch swapped from a stock 17 pitch prop and added a se sport hydrofoil helped a bunch since was not able to plane before with just wife and kid unless in shallow water put se sport hydrofoil on and with stock prop took a bit to plane out but then got up to 30 mph then put 15 pitch prop on and got up in less than a minute and would do top 25 -27
3) Current prop diameter and pitch (required).
4) Wide open throttle RPM and speed with an average load (very helpful)
4800-4900 at 1/4 or so trim 25 mph max mostly 21 ave load 2 adults and 1 kid + gear approx 600 lbs max load 1700 lbs rated
rpm after i fixed the tach which was on the wrong pos now tracks great max motor rpm rated 5250
5) Engine/drive make, model, year, and HP
1997 force by merc 120 hp exlpt
6) Boat make model, year, length and weight
starcraft starship 2000 db 1997 20' weight rated 3000 lbs
I have the shop manual for the motor going through tune-up on engine.
the foil and plate are just even with the bottom of the boat. the engine is at it's highest bolt holes. I replaced all 4 spark plugs and the old ones had normal deposits and some oil on the threads is this normal?
I did find at with the engine off at full throttle position there was still a bit of play with the carb throttle so i tightened up the throttle link. got maybe 1/8" or so of play. Assumed that means that it was not truely at full throttle. after this rpm went up 200 rpm.
I did compression checks on my motor all came back in spec I started timing the engine and at idle it was at 0 degrees is it safe to run the engine more than idle out of the water with a flush rig for a short period of time? was running the boat in the last couple days seemed rough at idle. going to sync carbs at 0 throttle today. how do I tell if I need to replace the fuel pump? sometimes there is a bubble in the inline fuel filter and some times the primer bulb does not get really hard.
should I go to a 4 blade prop to get up on plane with more than min load?
trying to get boat to plane out with friends aboard approx 300-400 lbs more with added weight top speed 13 mph wontget on plane tried having everyone sit in back and in front started with motor trimmed almost all the way in and played with trim a bunch. getting a bunch of splashing up front but wont finally get up on plane. also put a super screamer tube behind with 4 adults 1 kid (1 of adults on tube) and max speed was 12.5 mph. rope seems to drag in water a bunch since i only have transom mounts on either side of engine to attach to and they are only like a foot off the bottom of the boat.
2) Current prop manufacturer, model, aluminum or stainless as a minimum.
-quicksilver aluminum qa2034x 13.75 dia 15 pitch swapped from a stock 17 pitch prop and added a se sport hydrofoil helped a bunch since was not able to plane before with just wife and kid unless in shallow water put se sport hydrofoil on and with stock prop took a bit to plane out but then got up to 30 mph then put 15 pitch prop on and got up in less than a minute and would do top 25 -27
3) Current prop diameter and pitch (required).
4) Wide open throttle RPM and speed with an average load (very helpful)
4800-4900 at 1/4 or so trim 25 mph max mostly 21 ave load 2 adults and 1 kid + gear approx 600 lbs max load 1700 lbs rated
rpm after i fixed the tach which was on the wrong pos now tracks great max motor rpm rated 5250
5) Engine/drive make, model, year, and HP
1997 force by merc 120 hp exlpt
6) Boat make model, year, length and weight
starcraft starship 2000 db 1997 20' weight rated 3000 lbs
I have the shop manual for the motor going through tune-up on engine.
the foil and plate are just even with the bottom of the boat. the engine is at it's highest bolt holes. I replaced all 4 spark plugs and the old ones had normal deposits and some oil on the threads is this normal?
I did find at with the engine off at full throttle position there was still a bit of play with the carb throttle so i tightened up the throttle link. got maybe 1/8" or so of play. Assumed that means that it was not truely at full throttle. after this rpm went up 200 rpm.
I did compression checks on my motor all came back in spec I started timing the engine and at idle it was at 0 degrees is it safe to run the engine more than idle out of the water with a flush rig for a short period of time? was running the boat in the last couple days seemed rough at idle. going to sync carbs at 0 throttle today. how do I tell if I need to replace the fuel pump? sometimes there is a bubble in the inline fuel filter and some times the primer bulb does not get really hard.
should I go to a 4 blade prop to get up on plane with more than min load?
