Dr. Velocity
Cadet
- Joined
- Jul 24, 2007
- Messages
- 24
First of all, here's what's been done on the boat:
New alternator
New battery
New plug wires
New plugs
New rotor
New distributor cap
Timing checked: 10? BTDC @ 900 RPM, 36? BTDC @ 4000 RPM
New impeller
New Fuel pump
New inline fuel filter
Carburetor Rebuild kit
Lots of seafoam run through engine
Running the boat in the driveway in neutral, applying full throttle causes the engine to stumble and die. If I give it a bit of throttle (to take to around 2000 rpm) and then open the throttle wide open, it hesitates and then gains RPM. Even running at 3000 RPM, when WOT is applied, it hesitates for a second and then gains RPM.
I've checked the accelerator pump and it's squirting plenty of fuel into the carb throat. I haven't checked the engine compression yet, could this be the cause?
It's probably worth noting that when the engine was run on 87 octane fuel, the hesitation was almost non-existent. However, the engine pinged quite a bit on 87 octane fuel. Currently, it has 91/93 octane fuel in it with some octane booster as well. I'm wondering if this could be a bit too much octane?
Also, when I put the flame arrester on the carb (actually, just the plate with the crankcase vent tube attached), the engine runs considerably rougher. Is this a symptom that something is wrong deep inside the engine?
New alternator
New battery
New plug wires
New plugs
New rotor
New distributor cap
Timing checked: 10? BTDC @ 900 RPM, 36? BTDC @ 4000 RPM
New impeller
New Fuel pump
New inline fuel filter
Carburetor Rebuild kit
Lots of seafoam run through engine
Running the boat in the driveway in neutral, applying full throttle causes the engine to stumble and die. If I give it a bit of throttle (to take to around 2000 rpm) and then open the throttle wide open, it hesitates and then gains RPM. Even running at 3000 RPM, when WOT is applied, it hesitates for a second and then gains RPM.
I've checked the accelerator pump and it's squirting plenty of fuel into the carb throat. I haven't checked the engine compression yet, could this be the cause?
It's probably worth noting that when the engine was run on 87 octane fuel, the hesitation was almost non-existent. However, the engine pinged quite a bit on 87 octane fuel. Currently, it has 91/93 octane fuel in it with some octane booster as well. I'm wondering if this could be a bit too much octane?
Also, when I put the flame arrester on the carb (actually, just the plate with the crankcase vent tube attached), the engine runs considerably rougher. Is this a symptom that something is wrong deep inside the engine?