HELP.......

[OldSchool1713]

New to the forum, but not to BMW. I was blessed to have good friends who don't like German perfection with only 11k on the clock. I was given a 92 K75s that didn't run, but cranks. After sitting in my garage for the last 3 months I finally decided to take it to the shop. All I got is WOW, the cost to get this thing up and running is going to cost a small fortune  . I need to get the entire fuel system replaced FML. I want to get this gift and get some miles on it. I'm looking for some ideas on getting this thing going without auctioning off my first born (who I actually want to give the bike to, so we can keep our knees in the breeze).


I need any and all information on how I can get the fuel system either repaired or replaced with OEM or an aftermarket parts that are comparable. I am a little better than par with tools, so I don't believe that any repair outside of tearing down the the engine or trans should be that difficult.


Let me know what you Brick owners think.

[johnny]

here you go... click here...

[rbm]

Also try here.... http://k-bike-knowledge.000webhostapp.com/electrical/EFI/bike-wont-start-EN.htm

[Scott_]

I wouldn't be too quick to believe the bmw dealer mechanics..... chances are the bike is older than the tech that looked at it.  :yow 

Read the information in the links, the fuel system is very dependent on the electrical system. These bike are fairly robust, in that the mechanical systems will last a long time if cared for.

Check all of the rubber bits, brake hoses, gas line, etc..... at 25yrs old+ they can cause many issues.

[billday]

Just chiming in to second all of the above. These bikes are super easy to work on and have a very predictable pattern of mechanical needs. There are many sources for parts and service items, new and used. Here and at other forums you'll find a wealth of know-how -- much more than your average BMW dealer tech, who never touches a bike this age.

And once you get your '92 K75 running, it will be your friend for life!

[stokester]

Just chiming in to second all of the above. These bikes are super easy to work on and have a very predictable pattern of mechanical needs. There are many sources for parts and service items, new and used. Here and at other forums you'll find a wealth of know-how -- much more than your average BMW dealer tech, who never touches a bike this age.

And once you get your '92 K75 running, it will be your friend for life!

:2thumbup:

[The Mighty Gryphon]

Ummmm... 

Maybe you could start with a bit of information about the condition of the bike. 

Does it have a new battery?  Have you pulled the hoses and checked for cracking and air leaks?  Have you looked inside the tank?  Changed the fuel filter?  What do the spark plugs look like?  Does the fuel pump run?  What do the lights do?  What works/doesn't work? 

It sounds like you took a bike to the dealer and said it won't run, and nothing more.  Of course the dealer is going to figure it needs a ton of stuff because you haven't provided any clues as to where to start looking for problems.  I'm assuming the bike looks like it has been sitting in the back of a barn for 20 years.  Dealers often hi-ball bikes like that to chase away jobs that could take a lot of shop time and parts that the owner will probably walk away from.

[stokester]

<SNIP>
It sounds like you took a bike to the dealer and said it won't run, and nothing more.  Of course the dealer is going to figure it needs a ton of stuff because you haven't provided any clues as to where to start looking for problems.  I'm assuming the bike looks like it has been sitting in the back of a barn for 20 years.  Dealers often hi-ball bikes like that to chase away jobs that could take a lot of shop time and parts that the owner will probably walk away from.

Having worked as a tech at an auto dealership, you're right. 


If I was assigned a vehicle that was 25+ years old with no maintenance or repair history and limited information from the customer there would probably be a laundry list of things needing replacement.  The real problem is that in some cases it takes a lot of time $$ and usually parts $$ just to get to a point for a full diagnosis and if you don't fix everything you find it will come back.


So as Gryph said, give us some information on the bike and do some searches on this site on crank, no-start and tell us what you find.

[OldSchool1713]

The shop that I took it to is not BMW shop, they specialize in European bikes, and the tech is slightly older than I am. I've used them before on my C bike and my LT. Being quoted almost $900 to get the bike running with a new fuel pump. (on the key on you don't hear the pump pressurizing the system) So my issue is the $450 for the new pump. The tech is suggesting new injectors and replacing all of the fuel lines (I agree with this).
Now to answer the ?
@ TheMightyGryphon the battery is good and strong, when I opened the cap to the tank it smelled like varnish (have no idea how long the fuel sat in the tank), the bike cranks all the lights work. The bike was clean and the tires were new 10 years ago, the rubber nibs are still on the side walls of the bike.

Back story on the bike:
I got this bike from some friends that own a tow company, the relocated the bike from a couple that I know that purchased a house on a estate sale. The new owners contacted the previous owner of the house and it took 3 months to get a response from him (since he left a mint 87 MC SS in the garage with the K75s. The previous owner had a transporter come and pick up the MC and left the signed title for the K75s.

It appears that the only time this bike was outside was when the tow company had it before giving it to me. Here's a list of the things that need to be replaced according to the tech

(Fuel Pump Estimate) Customer States Restore Running Condition Crank is strong but bike does not start. Customer states battery is newer and is charged. Per Steve: Diag fuel pump/fuel delivery, TPS sensor, Injectors.Description: Part # Qty Description Part # DescriptionQty780734 0.00 AGM BATTERY MS53030 BM 13311461077 1.00 HOSE13311460928 6.00 CLAMP 16121180409 1.00 HOSE13311461011 1.00 HOSE 16111453690 1.00 GASKET17111465286 1.00 COVER 51161459064 2.00 SUPPORT51161459068 1.00 BUMP STOP 51161459069 1.00 PINFLF-565 1.00 FUEL GAUGE SENDING FPK-576OE 1.00 FUEL PUMP ASSY 576FINJ450EDL 3.00 FUEL INJECTOR 450Parts Subtotal $839.7

[stokester]

Not doubting the diagnosis but my fuel pump does not energize when the key is turned one - to my knowledge it requires the engine to be turning over, either with the starter or while running.


For a fuel pump and filter you may be able to save some money here -> [size=78%]https://www.beemerboneyard.com/k71011k1ak1u.html[/size]

[OldSchool1713]

Thanks stokester, I hate to say I did forget about the boneyard for parts

[Martin]

I have been running a $36.00 Au Chinese copy of the OEM pump since July 2017. I carry my OEM pump in the tail as insurance. I did research the Chinese pumps and bought one from the manufacturer. Be aware there are some dodgy pumps out there and it pays to do your research. If you want to play it safe go EME. http://www.motobrick.com/index.php/topic,10054.msg85798.html#msg85798
Regards Martin.

[Laitch]

Being quoted almost $900 to get the bike running with a new fuel pump. (on the key on you don't hear the pump pressurizing the system)

On a K75, the pump isn't heard when the key is turned to On. When the starter button is pressed it starts operating. It's heard when the starter button is released if the bike doesn't start. It whines for a couple of seconds.

[Revrdmark]

I might have the i tank pump from a 87 K100 you might need to splice the wires into the plate at the bottom of the tank. I’m not sure if the pump would work in your k75. Let me know with a pm if you’re interested


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[The Mighty Gryphon]

First thing I would do is clean out the crap in the tank and install a new fuel filter.  I would do this because varnish can also seal the paper element of the filter.  There is nothing special about the filter, any steel can with 5/16" hose barbs will work.   NAPA gold 3032 is what I use.

When it is clean, put a gallon of fresh fuel in the tank.  Disconnect the supply hose from the injector rail and stick it into a plastic bottle.   A two liter soda bottle is good.  Hit the starter to crank the engine and confirm that fuel is being pumped.

If not, unplug the four pin connector from the tank and check for 12v between the brown and the green/white wires on the plug when the starter runs.  This will give us some idea of where to start looking before having to spend stupid money on a fuel pump just to find out it's not the problem.