Hi all,
Freshly rebuilt 5.0GL-C in a 22’ cuddy cabin walk-around starts up and runs like a dream in the driveway, but won’t go above 2600 RPM when in the water. She hesitates a little coming off idle but then revs up but just falls on her face between 2,000-2,600. Sometimes it’ll backfire and stall, other times just rev but won’t make any more power under load.
Everything is new or rebuilt except for the fuel pump, all fluids and filters fresh. Timing (Delco EST, new dizzy, new coil) was set as per the instructions found elsewhere here, using the proper shunt tool. The carb was rebuilt and tuned but there is some play in the accelerator pump lever which might explain the initial hesitation but not the lack of WOT power under load, no?
My troubleshooting plan is this:
-Change fuel filter in case I sucked up some gunk from draining and putting in fresh fuel.
-Verify timing and make sure the electronic advance is working properly (how?)
-Fix or replace accelerator pump lever on carb
-Test/replace fuel pump
Am I missing anything? I’m praying for a simple fix here, or something I may have overlooked during the rebuild/reinstall. The WOT troubleshooting thread in the sticky above links to a thread about a Yamaha stalling issue, does anyone have the updated link to the original thread?
Thanks for the help!
Freshly rebuilt 5.0GL-C in a 22’ cuddy cabin walk-around starts up and runs like a dream in the driveway, but won’t go above 2600 RPM when in the water. She hesitates a little coming off idle but then revs up but just falls on her face between 2,000-2,600. Sometimes it’ll backfire and stall, other times just rev but won’t make any more power under load.
Everything is new or rebuilt except for the fuel pump, all fluids and filters fresh. Timing (Delco EST, new dizzy, new coil) was set as per the instructions found elsewhere here, using the proper shunt tool. The carb was rebuilt and tuned but there is some play in the accelerator pump lever which might explain the initial hesitation but not the lack of WOT power under load, no?
My troubleshooting plan is this:
-Change fuel filter in case I sucked up some gunk from draining and putting in fresh fuel.
-Verify timing and make sure the electronic advance is working properly (how?)
-Fix or replace accelerator pump lever on carb
-Test/replace fuel pump
Am I missing anything? I’m praying for a simple fix here, or something I may have overlooked during the rebuild/reinstall. The WOT troubleshooting thread in the sticky above links to a thread about a Yamaha stalling issue, does anyone have the updated link to the original thread?
Thanks for the help!