recently purchased a 90 K75RT that had sat, not run for some 3 years. it "cranked" over with great "vigor" but would not start. it was NOT prepared for long term storage. fuel has gone bad. when I pumped it out, I sucked up a lot of black sediment, didn't appear to be rust. I'm open to suggestion, I suspect I need to clean the injectors, what about the tank? add some gas, slosh it around and pump/pour it out till clean or send it off where? thanks in advance for suggestions/
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90 K75RT Clean fuel tank
- Thread starter madmatt
- Start date
anglojaxon
AATW!
That black sediment is more than likely the support ring the fuel pump sits in. It has some form of rubber that degrades over time from ethanol gas. The fuel lines will also get very brittle over time. That "sediment" clogs the fuel filter. The OEM replacements aren't made of the same material anymore. That filter on the right of the image is likely flakey too.
These parts aren't very expensive or hard to replace. I'd also replace the crankcase vent tube. It's a 'Z' shaped hose which has nothing to do with your post, but once you get fuel and it's cracked it'll run like crap. It generally cracks around the edges on the clamp. I'd suspect the fuel filter is clogged and the fuel lines inside the tank are cracked. Get a new support ring, fuel filter and the proper fuel line from MaxBMW. If the fuel pump is shot, now that's pricey, but there are alternative parts. Check out: www.motobrick.com, it's a great site for Bricks. There's a wealth of information and tech tips and many cases alternative parts for common items.
It doesn't sound that bad, but it is a major pain in the ass. Good luck, it's not that bad. Once that puppy is running it'll sound a lot like George Jetson's flying car.
Sediment:
The "not rust" will settle just below the fuel pump and eat a hole in you tank. I believed this caused corrosion and a leak.
Remove the fuel pump and wire a small siphon hose to a clean stick (for control) and siphon the crud up and out. There will probably be a small amount of water there too. A good flashlight helps also.
A leak happened to me at that low spot in the tank and was repaired (free) by the Aluminum person at a bike shop in town, after all prep by me. It burned a little paint but has been fine for 12 years. Still buy him a beer when I see him.
Charlie
The "not rust" will settle just below the fuel pump and eat a hole in you tank. I believed this caused corrosion and a leak.
Remove the fuel pump and wire a small siphon hose to a clean stick (for control) and siphon the crud up and out. There will probably be a small amount of water there too. A good flashlight helps also.
A leak happened to me at that low spot in the tank and was repaired (free) by the Aluminum person at a bike shop in town, after all prep by me. It burned a little paint but has been fine for 12 years. Still buy him a beer when I see him.
Charlie
