cfirenze315
New Member
Have a 1993 GTS with the white 587 engine, I cannot get it to rev out properly, in or out of the water. It starts and idles fine, no odd sounds or shakes. But when you try to rev it up at all, it sounds like it’s hitting a rev limiter and bogs/skips.
The top end has been replaced and compression verified. Fuel lines are new. Has new BR8ES plugs that are properly gapped. The rotary valve is set properly at 115 degrees with mag side at TDC. I’ve tried pulling the fuse for the rectifier and nothing changed.
After running it at idle and attempting to rev it up, the plugs were wet/black, so I rebuilt the the carb and noticed the jets in it were 142.5 main / 65 pilot. I replaced them with what it calls for stock, which is 125 main / 67.5 pilot. The pop-off pressure is also set properly. Low speed fuel screw is set 1-1 1/4 turns out, high speed fuel screw is at 0. Put new plugs in it, and still has the exact same symptoms.
I even have an additional MPEM that I tried to swap in it, and have the exact same symptoms with both. I also trimmed the plug wires to rule that out as well.
Truly at a loss at this point. It’s getting gas (apparently too much gas), it has good spark, and have ruled out the obvious electronic things. Again, starts and idles without issue, just cannot rev it up past a quarter throttle without it sounding like it’s hitting the rev limiter and bogging down. The symptoms are identical in and out of the water as well.
Seeing mixed reviews on rev limiters on them, is that even a thing? Any other suggestions?
The top end has been replaced and compression verified. Fuel lines are new. Has new BR8ES plugs that are properly gapped. The rotary valve is set properly at 115 degrees with mag side at TDC. I’ve tried pulling the fuse for the rectifier and nothing changed.
After running it at idle and attempting to rev it up, the plugs were wet/black, so I rebuilt the the carb and noticed the jets in it were 142.5 main / 65 pilot. I replaced them with what it calls for stock, which is 125 main / 67.5 pilot. The pop-off pressure is also set properly. Low speed fuel screw is set 1-1 1/4 turns out, high speed fuel screw is at 0. Put new plugs in it, and still has the exact same symptoms.
I even have an additional MPEM that I tried to swap in it, and have the exact same symptoms with both. I also trimmed the plug wires to rule that out as well.
Truly at a loss at this point. It’s getting gas (apparently too much gas), it has good spark, and have ruled out the obvious electronic things. Again, starts and idles without issue, just cannot rev it up past a quarter throttle without it sounding like it’s hitting the rev limiter and bogging down. The symptoms are identical in and out of the water as well.
Seeing mixed reviews on rev limiters on them, is that even a thing? Any other suggestions?
