Re: Motocarb 2150 Questions
You are right about the choke heater originaly having an oil pressure switch. It is a 2 pronged switch that tees into the fitting on the side of the block. It interupts the power to the choke until the engine is running. The purpose is to keep the choke from heating when the engine is cold and you have the ignition key on to use the accessories etc. The choke and the carb idle solenoid get their power from the "ignition hot" wire, usually red with a white tracer, check with a test light. In CA, you will have to connect the choke wire for legality, but it will run fine without it if you connect the stove heater. The purpose is to heat the choke faster, so it opens sooner. The solenoid won't usually be needed, in fact late SJ Wagoneers had a recall that eliminated the solenoid and subtituted a dampner to retard the throttle closing. If you have it, I would wire it in though. The solenoid idle speed should be around 650, the base idle speed around 500 rpm, this will prevent dieseling. The 2150 works pretty well as it has an aneroid on the rear that compensates for changes in altitude. If you rebuild it, be sure not to over tighten the aneroid screws as it is easily warped causing a major vacuum leak. Hope this helps, good luck.