jeff.sheard
Member
NSF5A Ok, I need help.
Nissan NS5A, 5 hp 4 stroke, replaced the fuel pump, spark plug and cleaned the carburetor this spring. I only put 94 octane in it because that's the only stuff that has zero ethanol around here. It's attached to a 9 foot Achilles inflatable with wood transom and keel.
So the issue:
Only while the hull is planing, at 100% throttle, and top speed, with just me in the boat, after about 20-30 seconds there is a high pitched whirring noise that comes from the engine before it just chokes. (well chokes might not be the right word...she just stalls/dies/turns off)
What's frustrating about this problem is that it only happens when the boat is acting like a planing hull (not a displacement hull) and at high speeds.
The thing will run all day long at 100% throttle if there is 2 people in the boat. And I fished yesterday (trolling at low speeds) for almost 7 hours and I think this thing only drank a tablespoon of fuel. I love this thing...I just wanna go fast!!!!!
Sometimes after this happens, I can pull start it back up and she'll run ok in low-medium rpm.
But other times, I can barely keep it running by playing with the choke, and trying to find that throttle sweet spot that will just let me limp home.
I just don't know where to begin to troubleshoot this thing. Please help!!!
Nissan NS5A, 5 hp 4 stroke, replaced the fuel pump, spark plug and cleaned the carburetor this spring. I only put 94 octane in it because that's the only stuff that has zero ethanol around here. It's attached to a 9 foot Achilles inflatable with wood transom and keel.
So the issue:
Only while the hull is planing, at 100% throttle, and top speed, with just me in the boat, after about 20-30 seconds there is a high pitched whirring noise that comes from the engine before it just chokes. (well chokes might not be the right word...she just stalls/dies/turns off)
What's frustrating about this problem is that it only happens when the boat is acting like a planing hull (not a displacement hull) and at high speeds.
The thing will run all day long at 100% throttle if there is 2 people in the boat. And I fished yesterday (trolling at low speeds) for almost 7 hours and I think this thing only drank a tablespoon of fuel. I love this thing...I just wanna go fast!!!!!
Sometimes after this happens, I can pull start it back up and she'll run ok in low-medium rpm.
But other times, I can barely keep it running by playing with the choke, and trying to find that throttle sweet spot that will just let me limp home.
I just don't know where to begin to troubleshoot this thing. Please help!!!