I have been using this Forum for years and thank everyone for the great input that is given here. This is probably my first post because i usually find my answers just searching and reading but I am at a loss
I have a 84 to 86 4cyl 75 hp merc. serial number 0B107213, compression 115. 120.120, 120. Carbs cleaned 3 times soaked overnight twice, All passages cleared with wire. carb cleaner and compressed air. float level set to spec no leaks when ball is pumped.Good hole shot great high speed 5500 rpms smooth running. new plugs spark is blue and jumps a 7/16 gap very sharply on all cly
all adjustments done in water
I cant get the Idle correct. timing is set to 7 to 9 BTDC just as cam is touching per manual I am at 12 to 1300 rpms. If I set timing below that (Closer to 0 ) to reduce idle to anywhere below 1000 the engine dies when put in gear. I can adjust carbs richer (very rich) and bring down the idle with the timing set per manual . i can then get it into gear by playing with the throttle as soon as i get it into gear. I can then adjust carbs for best results and use the idle adjustment to get everything just right boat runs good out of the hole and wot with no problems but idle in gear is not great or very consistent and then when I take out of gear Im back to 1500 rpms. I have started from scratch a number of times with same results
Any help would be greatly appreciated
I have a 84 to 86 4cyl 75 hp merc. serial number 0B107213, compression 115. 120.120, 120. Carbs cleaned 3 times soaked overnight twice, All passages cleared with wire. carb cleaner and compressed air. float level set to spec no leaks when ball is pumped.Good hole shot great high speed 5500 rpms smooth running. new plugs spark is blue and jumps a 7/16 gap very sharply on all cly
all adjustments done in water
I cant get the Idle correct. timing is set to 7 to 9 BTDC just as cam is touching per manual I am at 12 to 1300 rpms. If I set timing below that (Closer to 0 ) to reduce idle to anywhere below 1000 the engine dies when put in gear. I can adjust carbs richer (very rich) and bring down the idle with the timing set per manual . i can then get it into gear by playing with the throttle as soon as i get it into gear. I can then adjust carbs for best results and use the idle adjustment to get everything just right boat runs good out of the hole and wot with no problems but idle in gear is not great or very consistent and then when I take out of gear Im back to 1500 rpms. I have started from scratch a number of times with same results
Any help would be greatly appreciated