my05hammer
Seaman Apprentice
- Joined
- May 21, 2011
- Messages
- 36
OK. Got the boat for cheap cause the previous owner couldn't get the motor to run right under power.
Its a Johnson 115ETL77.
Here is what is happening with the motor. It didn't run when I got it. The cylinder pressures check good to almost new. I got it to run like a banshee on the trailer. I get it in the water and at about 25% throttle it falls flat on its face and dies. This motor does NOT have the over temp safety built in that will limit the rev's when overheated (or temp switch goes bad).
Here is what I have done so far.
1) Verified that timing pointer was set correctly.
2) Changed the plugs (gap set at 0.040).
3) Set the min and max timing, 4* and 28* BTDC respectively.
4) Lifted the #1 wire off of the power pack and installed a kill switch on the engine to eliminate any boat wiring issues.
5) Replaced water pump and housing.
6) Relocated the tell tail up to the boss on #1 cylinder.
7) Tore open the carbs, replaced the needle and seats but did nothing else because they looked clean.
8) Replaced rectifier because the wires were in bad shape.
9) Pulled the block mounted fuel pump, plugged the port and replaced it with a universal electric pump for a carburated vehicle.
What in the heck could possibly be going on with this engine? I have good spark, the timing is correct, and it has fuel. I spoke with my dad (an awesome old school mechanic), and he and I were thinking that maybe the high speed orifices might be plugged. I just dropped the fuel bowls and I don't see any jets or orifices in the bowls. Only the tube that comes down from the venturi and it is clear as well as all of the ports that are in it. Is it possible that this problem is being caused by a plugged low speed jet?
Fore crying out loud, It ran like a banshee yesterday in the driveway, then today after work I dropped the motor in the water at the boat launch and fired it up only to have the problem again. So it is obviously a problem under load. I pulled the boat from the boat launch, drove home with it, then after about 30 minutes in the garage, I turned the key and the darn thing popped right off.
I am starting to become very frustrated with this.
Its a Johnson 115ETL77.
Here is what is happening with the motor. It didn't run when I got it. The cylinder pressures check good to almost new. I got it to run like a banshee on the trailer. I get it in the water and at about 25% throttle it falls flat on its face and dies. This motor does NOT have the over temp safety built in that will limit the rev's when overheated (or temp switch goes bad).
Here is what I have done so far.
1) Verified that timing pointer was set correctly.
2) Changed the plugs (gap set at 0.040).
3) Set the min and max timing, 4* and 28* BTDC respectively.
4) Lifted the #1 wire off of the power pack and installed a kill switch on the engine to eliminate any boat wiring issues.
5) Replaced water pump and housing.
6) Relocated the tell tail up to the boss on #1 cylinder.
7) Tore open the carbs, replaced the needle and seats but did nothing else because they looked clean.
8) Replaced rectifier because the wires were in bad shape.
9) Pulled the block mounted fuel pump, plugged the port and replaced it with a universal electric pump for a carburated vehicle.
What in the heck could possibly be going on with this engine? I have good spark, the timing is correct, and it has fuel. I spoke with my dad (an awesome old school mechanic), and he and I were thinking that maybe the high speed orifices might be plugged. I just dropped the fuel bowls and I don't see any jets or orifices in the bowls. Only the tube that comes down from the venturi and it is clear as well as all of the ports that are in it. Is it possible that this problem is being caused by a plugged low speed jet?
Fore crying out loud, It ran like a banshee yesterday in the driveway, then today after work I dropped the motor in the water at the boat launch and fired it up only to have the problem again. So it is obviously a problem under load. I pulled the boat from the boat launch, drove home with it, then after about 30 minutes in the garage, I turned the key and the darn thing popped right off.
I am starting to become very frustrated with this.
