20 Most Recent 1991 BMW K 75 S Questions & Answers

check the engine compreshions first they should all be above 120psi better still 150psi then fit new plugs it could be a bad wire joint wip off the tank and clean all the wire joints you can find then grees them with switch cleaner with lub in it,,,bmw's get bad wire joints if not looked after,,i hope this helps find this fult

check the spark plugs and the ht leads,,,then wip out the brain box and pull the plug off it so you can give it a good swilling of wd40 if this hasent sorted it out your very unlucky,,,,most k75s are boom proof
but bits are pricy, ht leads are £45 each!!!!!! so dont brake them????
all the parts you could sak for can be found on "ebay uk" and there farly cheep on there as well,

Is this BMW new to you? Ever ride a Beemer before?

BMW's tend to feel like they are pulling to the left because to the way the engine is set in the motorcycle.

At least the two I have ridden did that and I was infored by the owners to expect it.

Yours may be a different problem, but consider this first.

Thanks for your interest in FixYa.com

If the motor rocked foward/backwards then things seemed to start working its not the starter motor. It sounds like the motor is resting or putting tension or have melted/shorted some electrical wires and when it rocks foward/backward releases the tension on wiring causing the random shorting. Check all your electrical wiring around the motor and make sure none look to be too tight or under pressure.Depending on you setup you may need to pull the fairings off for a full inspection

I would be thinking more about a decent second hand K1200RS - far superior in every way to the K1100RS. Plenty of good used examples around at reasonable prices and a huge aftermarket options list. You should be looking around US$5K for a 2000 model MK1 RS and it will do everything you can throw at it.

With everything undone use a rubber or plastic mallet to slide the forks out

The gear moves out to engage and back when it starts, SO the starter may be shot or the gear needs cleaned and lubed

... as in you turn the key on and the starter starts running? I would look in two areas..First, find and check the start solenoid. I think it may be stuck in the 'closed' position. This could be due to one of two reasons: 1 - it is physically stuck, closing the contacts in this electrically operated switch - 2 - there is a short in a wire that keeps the solenoid charged all the time. When you press the start button, the solenoid (an electric magnet switch) is charged, pulling a plunger into a position where the battery is connected to the starter. When you release the start button, the electric magnet is turned off and the plunger (with the help of a spring) is suppose to open the contact turning off the starter.The other reason is mechanical. The starter gear may not be releasing from flywheel for some reason, probably a lever or weak or broken spring. I am not a BMW expert, but those are the things I would be looking for in your case. Good luck with your project and thanks for your interest in FixYa.com

you could try not engaging full choke and letting it warm up for longer or look at carb ballanceing?

search salvage yards online or european bikes mags--------archway in st louis may have one-------aftermarkets mite not work rite---germans made ur scooter--also see if u can repair it-buy a haynes or clymer manual for the bike

I would recommend a leak down test to distinguish if the low compression was due to ring wear or an issue with the valves/seats...cylinders bores dont just wear out from sitting.
It's very possible that the valve seals were worn allowing crankcase oil to seep into the combustion chambers, thus causeing it to smoke. Being a 3 cylinder water cooled engine it should not have an overheating issue to cause the rings to stick...unless it was neglected, and not regularly serviced, debris in the oil filter, low oil pressure.. sludge from worn out oil. A good clean air cleaner is important...bad filtration will cause premature engine wear. Install a K & N high flow filter... and your good for the life of the bike.
Hope this answers your question...good luck with your bike.

try e-bay there are lots of manules on there for the k75 there all the same bike even the k75rt's will do you or if your good with computers go to www.maxbmwmotorcycles.com that should help as well,,,ps,,there should be no parts left over????

probly not gitten spark cause ign is worn--may not be gitten proper fuel intake also--bike is old so du a compression test

ok get some wd40 or switch cleaner and give the handel bar switches a good socking give the cut out switch a good going over this switch is most likle to be the one playing you up,,dont try to strip the switch down its full of tiny little bits that will go PING!!! and you will loos them then?

I am not a motorcycle expert, but I'm guessing your float needle is stuck, asuming you don't have fuel injection. Add a few ounces of Chevron Techron to your fuel tank. Then spray some starting fluid in the air intake, usually under the seat, and see if it starts then.