20 Most Recent 1985 BMW R 80 Questions & Answers

not realy if it runs it runs,,,but if you had looked on
e-bay "there be coils there!" for the bidding its well worth a look if you need parts.. just type in bmw r 80 parts,,,then let loos your wallet!!!

Bill,
What you are describing sounds like an ignition coil breaking down as soon as it come up to temperature. It could also be as simple as a spark plug and most probably is. I tend to disagree with the suggestion you received about the contact points (if your motorcycle actually has them). Generally points will make a mess out of starting and if they are failing wouldn't wait 20 minutes to let you know. I'm going to say spark plug(s) (change 'em both) then possibly a coil OR the high tension lead is shorting against the block or some part of the frame. Now I can't say names or someone will get upset but a German made motorcycle doesn't generally work to well with spark plugs made in America. Been in the Recreational business for a lot of years and if there is one spark plug that just works it's found in every Honda MC and of course is made in Japan. Hope you picked up on were i was trying to lead you ;-). Cheers have a great day, hum you riding your motorcycle and I'm up to my bum in snow and getting another foot of the stuff :-(

If battery and starter are as good as you say try checking the condition of the earth leads from battery to frame and any earths from engine/starter motor to frame. A corroded terminal could be the problem. Also check pos wire from battery to starter and any relay in system.

hi,if i remember rightly,your bike has a dry single plate clutch(same set up as a car),by what you describe i think your clutch plate is just about worn out,and unfortunately it is located on the back of the motor,it is a reasonably big job to replace..sorry...hope this helps

Not a problem , most boxers do this unless you change the voltage regulator to upgraded solid state version that charges quicker at higher voltage.

It is a simple system ...

there is a storage area (battery)
there is manufacturing (an alternator probably with an integral voltage regulator)
and a processing plant (a rectifier)

The first thing I would check would be the rectifier - they are the weak link in a charging system. The diodes in a rectifier will pass electricity in one direction only. If you check with either a ohm meter or a d battery with a dmall flashlight lamp - one direction will light or be "short" and the other way will not llight or be 'open'. It is possible that 1/2 or all of your rectifier is dead.


And of course, a purist will tell you you must have power to make power, and that is true. To get power from an alternator, you must put power in (to energize the coils) If your battery is dead, you cannot charge it.
I hope this helps

"T" is TDC, "S" is 5deg BTDC.

Disc brakes???
If yes, you probably hav a frozen caliper. These are re-buildable. I have had good luck by removing the piston, cleaning up the piston and the bore, and lube the piston up and re-install with no parts. But the procedure requires an experienced set of hands.

there are a few adj. screws on carburetors air/fuel, sync, idle,
http://www.pdfee.com/search/mikuni+bs26+carburetor/page/2
this is a link to the manual it'll tell you everything you need to know. If you need anything else feel free to contact me
M.Woodring

if the pads are stuck its down to the brake cylinders that are sezed up pull out the pads and clean the brake cylinders untill you can push them in by hand, pumping the clinders out a little first will help get to the dirty parts be cearfull not to scratch the pistons when your cleaning them and use some coper grees on the back of the pads when you refit them use WD 40 on the drake cylinders to free them off after cleaning them off

it could be that you have a vacuum leak between the cylinder and the carb that is leaning out your fuel, check the connection between the the two. to confirm that there is a vacuum leak spray some brake cleaner or any flammable gas on the connection between the two and if the revs go up, you found the problem... hope that helps

this means that while starting your bike you pull up to much accelerater try starting it with very little amount of accelerater.. there could also be the plug problem or its wire.. while another thing could be fuel filter if you have one..thank for consulting

The battery hides just underneath the rear of the fuel tank. The video shows how to replace it by lifting the rear of the tank. This is the new battery specifications

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depending on your scanner you may not retrieve abs codes check fuses the usual problem is a failed or damaged abs sensor borrow or have a shop run /scan for codes