First, the tachometer<br />I bought one yesterday, teleflex, and need to set up the number of pulses per engine revolution. I can't find the answer in my Clymers manual. The engine is a 1973 Johnson 135hp V4. It has a stator/coil assembly and unregulated charging system. A factory tach wire comes to the control box from a rectifier lead. I suspect the answer is 4 pulses per revolution since there are 4 cylinders and the teleflex manual says that is typical for 2 cycle engines. Does anyone have the answer for this?<br /><br />Second, A new 6 gallon plastic OMC fuel tank.<br />I could barely start my motor, missing/ smoking etc, and when I finally got it started a lot(a cup or 2) of oil sprayed out of the prop exhaust onto the garage door. I unhooked the fuel supply from the fuel tank at the engine and found the tank was under a lot of positive pressure, spraying out past the check valve on the tank hose end coupling like a leaky faucet. I then ran the motor under load until the problem cleared up and the engine returned to its usual beast self. The tank is self venting but apparently only venting when suction is applied to it. Ive concluded that atmospheric pressure changes have been pumping fuel into the crank case through the fuel pump to the reeds, or to the carbs then the reeds. Has anyone else had this experience? Are these tanks designed to vent only on suction? Comments appreciated.
