Hello, i have a mercury 500 thunderbolt 50hp, i think its a 1976(number on motor 4359415). Ok so the motor is hard to start but will idle smooth, low speed throttle is great, but when shifted into gear with high throttle the motor dies. The primer bulb goes soft after started. I cleaned the carbs but think it needs a tune. Not sure what screws to adjust. I run the motor under loaded conditions in a bucket of water.
From what i have read i think its the fuel diaphragms, Any other things to check? am i on the right track? Thanks
From what i have read i think its the fuel diaphragms, Any other things to check? am i on the right track? Thanks