captbobbbbbbb Posted June 7, 2011 Share Posted June 7, 2011 I have a 1986 k75c, just got it..... first bike, has been in storage for 5 years. replaced ; fuel pump, fuel filter, battery, rebuilt fueltank cap. fuel pressure is 30- 32lbs when I run the bike it will randomly die while underway, the bike will restart after a period of time. There is no fuel flow when the bike is in shut down mode. my problem is? Link to comment
Paul Mihalka Posted June 8, 2011 Share Posted June 8, 2011 Could be lack of venting into the fuel tank. Try it with the gas cap left open. Link to comment
John Ranalletta Posted June 8, 2011 Share Posted June 8, 2011 Check out the fuel pressure regulator that returns excess fuel not sent to the injectors back into the tank. I had a 75 that sat for years. After welding holes in the tank and replacing all the innards, the thing just wouldn't run except in short stints. I sold it and the buyer said he replaced the regulator and fixed the problem. Link to comment
kobukan Posted June 8, 2011 Share Posted June 8, 2011 One possibility is the power to the fuel pump passes through the fuel level sending unit inside the tank and they have been known to go bad (easily replaced for about $100) causing intermittent interruptions in power to the fuel pump causing the pump to stop and the bike dies. The electrical plug going to the tank can also be a problem - make sure pins are clean and tight. When the bike dies test to confirm you're getting power to the wire at the fuel pump when the starter button is pressed. If no power at the wire at the pump, check for power at the electrical plug to the tank. If the plug is getting power, but the pump isn't, replace fuel level sending unit. Link to comment
James Clark Posted June 8, 2011 Share Posted June 8, 2011 No one is going to suggest crank sensor? Link to comment
elwoodpone Posted June 10, 2011 Share Posted June 10, 2011 Just for fun check the ECU connection. Link to comment
cjack Posted June 11, 2011 Share Posted June 11, 2011 No one is going to suggest crank sensor? That's the obvious one... Link to comment
Fasterpill Posted June 16, 2011 Share Posted June 16, 2011 I'm with elwoodpone on this one. My K100 did the same thing. I bought a can of electrical cleaner spray and sprayed the motronic connections and that took care of it. I also changed the plugs. That seems stupid but it was really effective in curing ignition woes. The motronic is under the seat. Link to comment
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