QuestionI have a 1984 Honda Magna V45 that I am trying to get running. It has been sitting for approx. 8 months before I purchased it. I am having an issue getting fuel to the carbs. I checked the fuel lines and no issues. I have taken 12V power directly to the fuel pump and it appears to function properly. When connected and trying to start the bike, no fuel is being pumped. I have resorted to the Haynes manual for the fuel pump relay details only to find "no information is available on the relay fitted to the 700/750 Magnas". I see the wiring diagram shows a fuel cut-off relay. I see what appears to be 3 relays. One mounted to the bottom of the battery box, one mounted to the back of the battery box just above the fuel filter and one mounted between the fuel pump and rear fender. What can I check and where might it be located?
AnswerMichael...
http://www.cmsnl.com/honda-vf750c-v45-magna-1983-usa_model7608/partslist/F++18.h... #18 is the fuel cut relay, which looks like it is located towards the front of the battery box. The fuel pump setup is run by the ignition module which runs a timed pulse to the relay for a few seconds to re-prime the carbs, then stops until the engine is running.
You can match the wire colors at the fuel pump with those of the fuel cut relay to verify you have the correct part in hand. Looks like the white wire connects the relay to the pump.
Found this for you...
http://electricwiringdiagram.com/wp-content/uploads/2009/12/wiring-electric-diag...
Frankly, if the carbs were left for 8 months with old fuel in them, then the idle jets may be plugged up, requiring carb removal and cleaning anyway.
When you are ready to fire the bike up, jumper 12v to the pump long enough for it to fill the fuel system, then let the electrical system control it from there. Normally, you will see a few seconds of pumping, then it quits, until the bike is running. It is hard for the bike to get going when carbs have been drained and all the lines need refilling again.
Bill Silver
