Mike4130
Senior Member
- Messages
- 188
- Location
- North Ridgeville,Ohio
Let me start of by saying I've watched the carb tuning video by Trip & OBR. Both of which were very helpful.
I've been trying to tune my 990 for a while now and have been noticing this,
I start at 1 1/4 out on the LSN, I slowly turn it clockwise until the rpm's lower then begin to increase again. I stop the needle at the highest RPM. This will bring the needle out about 3/4 to 1 full turn from the closed position. If I leave it @ 1 1/4 the throttle isn't very snappy (it bogs at first, possibly to rich).
At this point I do a high speed run, the plug looks good (similar color to a brown paper bag). Now, at this needle setting, it's a bear to start. I pull the cord 12-15 times to start it. Possibly not enough fuel.
So now, I set the LSN to 1 1/4 out, it starts on 4th pull (great) but on high speed runs, the motor bogs out (Carb is running to rich). Is this a improper high speed needle setting? I have it @1 1/8th out. Weird thing is, when running really lean on the LSN (3/4 turns out), this problem doesn't happen.
I'm just being cautious of running to lean & burning up my motor.
Thanks for any input.
I've been trying to tune my 990 for a while now and have been noticing this,
I start at 1 1/4 out on the LSN, I slowly turn it clockwise until the rpm's lower then begin to increase again. I stop the needle at the highest RPM. This will bring the needle out about 3/4 to 1 full turn from the closed position. If I leave it @ 1 1/4 the throttle isn't very snappy (it bogs at first, possibly to rich).
At this point I do a high speed run, the plug looks good (similar color to a brown paper bag). Now, at this needle setting, it's a bear to start. I pull the cord 12-15 times to start it. Possibly not enough fuel.
So now, I set the LSN to 1 1/4 out, it starts on 4th pull (great) but on high speed runs, the motor bogs out (Carb is running to rich). Is this a improper high speed needle setting? I have it @1 1/8th out. Weird thing is, when running really lean on the LSN (3/4 turns out), this problem doesn't happen.
I'm just being cautious of running to lean & burning up my motor.
Thanks for any input.