Ski'nBlind
Seaman Apprentice
- Joined
- Jun 20, 2010
- Messages
- 32
Re: Idle Fine Tuning, 1988 115 L6
Yeah, 10 deg's must have made a huge difference in rpm at idle. The marks are a reference point that is the same on all engines but the final idle speed adjustment can vary from motor to motor. After I set the initial timing, I set the proper rpm which further retards the timing. I never did use the timing light to "see" what the timing actually is running at idle but it must be retarded another few degrees past the marks. I wonder how many people are setting their initial timing at idle in nuetral....which would be incorrect.
Since the motors idle rpm is adjusted purely by timing and the mixture screws there's lots of room to "fine tune" and find whatever YOUR motor likes.
Mine drops 100-150 rpm as best I see on the tach....not much room there to tell the difference. I start my mixture screws setting at 1-1/2 turns out and then start to tweak. Every time I work through that mixture adjustment procedure in the water the carbs are not set the same. Top carb= 1-3/4 out, middle carb= 1-1/2 out, bottom carb= 1-1/4....or something close to that.
I removed my idle stabilizer and threw it away. Did you put the BB in the ported vaccum tube that goes across the top of the carb? Not sure if your '88 had that feature but it's worth checking into.
Yeah, 10 deg's must have made a huge difference in rpm at idle. The marks are a reference point that is the same on all engines but the final idle speed adjustment can vary from motor to motor. After I set the initial timing, I set the proper rpm which further retards the timing. I never did use the timing light to "see" what the timing actually is running at idle but it must be retarded another few degrees past the marks. I wonder how many people are setting their initial timing at idle in nuetral....which would be incorrect.
Since the motors idle rpm is adjusted purely by timing and the mixture screws there's lots of room to "fine tune" and find whatever YOUR motor likes.
Mine drops 100-150 rpm as best I see on the tach....not much room there to tell the difference. I start my mixture screws setting at 1-1/2 turns out and then start to tweak. Every time I work through that mixture adjustment procedure in the water the carbs are not set the same. Top carb= 1-3/4 out, middle carb= 1-1/2 out, bottom carb= 1-1/4....or something close to that.
I removed my idle stabilizer and threw it away. Did you put the BB in the ported vaccum tube that goes across the top of the carb? Not sure if your '88 had that feature but it's worth checking into.
