1992 K75s fuel delivery problems
I just bought a 1992 K75 which sat with only a small tarp cover for over 2 years. It wasn't running but I installed a new battery as a start toward at least getting it running. When I first tried cranking it there was some weak firing but didn't respond too well to the throttle as if running way too lean. I cranked it again using the "choke" full on resulting in gasoline accumulating in the exhaust pipe after about 10 to 15 seconds of cranking. It did not fire even once. I decided to try leaning it down by clamping off the fuel delivery line between the pump and fuel rail (i know this would not be advisable) and it ran great for about 5 seconds until the fuel line was empty. I tried again to crank it normally and.....nothing. To see if the fuel delivery line was pressurizing, after.about 10 minutes I loosened the fuel line at the fuel rail and it still had considerable pressure. I let it sit for a day and now it starts and runs terribly like the mixture is too lean but the plugs are sooty but dry and it won't really run at all at small throttle openings. This is my ninth BMW over 20+ years, five of which were fuel injected but I have never encountered anything like this. Any ideas would be appreciated.
K75 fuel delivery problems
Thanks, Lostboy. I'll check that out; I have to remove the tank anyway to attempt to bleed the front ABS unit.
K75S fuel delivery problems
Thank all of you very much. I feel a bit embarrassed that I listened to someone on another site about the location of the front ABS modulator. The bike is still on a trailer with the left side next to a wall so it's location wasn't apparent. Anyway, I bled the modulator and the front calipers again but I still don't have any significant lever pressure so I suspect a not too healthy master cylinder. I still believe that, somewhere along the line, I'll also discover frozen caliper pistons but that's something I can deal with. Is a significantly rusted ABS counter ring likely to be a problem? Because it is an inductive signal from the counter, rust shouldn't be a problem, should it? Again I thank you all for your helpful input.
92k75s fuel delivery problems
I've made a little progress in that I now have a little pressure at the brake lever even though I got zero air bubbles at the front ABS modulator or any movement of the fluid remaining in the bleeder hose. The master cylinder is leaking so that's part of the problem at least. I've decided to take the fuel issue to the experts but will battle the brakes on my own (well, with guidance from you guys). BTW, what is the purpose of the diaphragms in the fluid reservoirs. I removed them while bleeding to increase the fluid volume. I assume they are there to reduce sloshing of fluid in the reservoir. Progress!
92 k75s fuel delivery problems
Thanks 98lee. I've ordered the master cyl rebuild kit and will use the time for delivery to locate and buy a circlip tool for removal of the piston. I've protected the paint with a plastic bag on the fairing covered with a towel.