...This is in regards to my 1971 Mercury 1150 (115 HP) outboard.
Problem: When I advance the throttle to wide open it will sputter and pop as well as only reaching 3200 RPM.
...If I back the throttle off of wide open a touch it will stop sputtering/popping and slowly climb to 3800-4000 RPM. When I do reach near the 4000 RPM mark I have tried to advance to WOT and it will start to sputter/pop and drop the RPM back down to 3200.
This motor has me about ready to sink it to the bottom of the lake
Here is a list of work/test I have done.
1. Rebuilt the fuel pumps and replaced the exterior fuel lines along with primer bulb. I also drained the gas tank.
2. Rebuilt the carburetors and set floats to spec. Checked the High speed jet size.
3. I have tested for spark on all of the cylinders as well as the quality. They jump a 7/16" gap.
4. Compression is 130# +/- 2# on all cylinders.
5. replaced dissy cap with new/used, as well as a new carbon button for the rotor inside of cap.
6. Checked HT wires at night for arcing, they checked OK
7. Testes coil and switch box by jumping brown term to white term, then arcing black. They tested OK.
8. Replaced the old wires on the motor.
9. Tested voltage at switch box, I have 12v at red term and 12v at white with ign. key on.
10. I have replaced the ign. switch (it was faulty)
11. When cranking I have at least 9.6v on the switch box.
12. Did a link&sync. Max advance is set to 23 deg. and primary pickup is set to 3 deg.
13. I have verified the carb butterflies are opening fully.
14. New spark plugs, L76V
It seems once the throttle engages the secondary pickup is when the sputtering/popping happens. If I hold it wide open without engaging the secondary it will run fine. Does this seem odd?
The motor idles/starts fine. When I have it WOT I tried to hit the choke as well and it dropped RPM so I know its getting fuel.
I have a 17 pitch prop.. Its on a 19' closed bow, v-hull. I have never ran this setup before.
I am completely stumped can anyone figure this one out for me
...I will buy ya a beer!
Problem: When I advance the throttle to wide open it will sputter and pop as well as only reaching 3200 RPM.
...If I back the throttle off of wide open a touch it will stop sputtering/popping and slowly climb to 3800-4000 RPM. When I do reach near the 4000 RPM mark I have tried to advance to WOT and it will start to sputter/pop and drop the RPM back down to 3200.
This motor has me about ready to sink it to the bottom of the lake
Here is a list of work/test I have done.
1. Rebuilt the fuel pumps and replaced the exterior fuel lines along with primer bulb. I also drained the gas tank.
2. Rebuilt the carburetors and set floats to spec. Checked the High speed jet size.
3. I have tested for spark on all of the cylinders as well as the quality. They jump a 7/16" gap.
4. Compression is 130# +/- 2# on all cylinders.
5. replaced dissy cap with new/used, as well as a new carbon button for the rotor inside of cap.
6. Checked HT wires at night for arcing, they checked OK
7. Testes coil and switch box by jumping brown term to white term, then arcing black. They tested OK.
8. Replaced the old wires on the motor.
9. Tested voltage at switch box, I have 12v at red term and 12v at white with ign. key on.
10. I have replaced the ign. switch (it was faulty)
11. When cranking I have at least 9.6v on the switch box.
12. Did a link&sync. Max advance is set to 23 deg. and primary pickup is set to 3 deg.
13. I have verified the carb butterflies are opening fully.
14. New spark plugs, L76V
It seems once the throttle engages the secondary pickup is when the sputtering/popping happens. If I hold it wide open without engaging the secondary it will run fine. Does this seem odd?
The motor idles/starts fine. When I have it WOT I tried to hit the choke as well and it dropped RPM so I know its getting fuel.
I have a 17 pitch prop.. Its on a 19' closed bow, v-hull. I have never ran this setup before.
I am completely stumped can anyone figure this one out for me
...I will buy ya a beer!