If the air vent is clogged or not adjusted right would this effect the top end rpm when the motor is under a load. I took the carb off of a 1999 yamaha 4 cycle and cleaned the jets and put new guts in except for the air vent. Place carb back on motor and now everything is running great in...
Looking for info on Fins added to the lower units. I have a 9.8 mercury 60's or 70's model and need more top end speed. Thinking about adding a fin to the lower unit. Does anyone have any experence with them and do you think this might get me some more top end speed.
Thanks
Chris
I have a 9.9 hp 4 stroke yamaha that is running at 3000 rpm with the throttle wide open. I have rebuilt the carb. and put new plugs in the motor. Does anyone know what my problem could be. Kids are driving me crazy because they want to go tubing.
Thanks
Yamaha chris