The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: Matt Chapter on October 29, 2010, 02:10:32 PM

Title: So there I was in the dark, no shoulder, pushing..
Post by: Matt Chapter on October 29, 2010, 02:10:32 PM

Last night I was out for a spin, and I was riding along about 50 or 60 mph when I had a sudden dramatic loss of power.  As soon as I coasted to a stop the engine quit.  The battery seemed to have a full charge, the motor turned over fine but wouldn't catch.

Plenty of fuel coming through the newish lines, I replaced the coil with a dyna coil about 4 or 5 years ago.. anybody have any thoughts?

The bike in question is an '86 with an '84 motor, and I just (about 150 miles ago) replaced the wiring harness.

Title: Re: So there I was in the dark, no shoulder, pushing..
Post by: Bob_Roller on October 29, 2010, 02:34:03 PM

Remove the spark plugs from the cylinder, place them on the cylinder fins .

Turn your ignition key on and off, every time you turn the key on, both plugs should fire, it's a quick test for your ignition system .

If you don't get any spark, you need to go back and check the wiring, some wire connection may have come loose .

Title: Re: So there I was in the dark, no shoulder, pushing..
Post by: nhmaf on October 30, 2010, 09:25:32 PM

I agree with Bob's suggestion - chances are good that you had a connector that wasn't firmly in place, and chose that moment to come loose.   Pay particular attention to the ignition key connectors and the connectors at the ICU and coil(s).

Title: Re: So there I was in the dark, no shoulder, pushing..
Post by: Rob Valdez 79 R65 on October 30, 2010, 09:40:28 PM

And the kill switch.  Move that back & forth several times to make sure it isn't malfunctioning.

Title: Re: So there I was in the dark, no shoulder, pushing..
Post by: Yikes on November 02, 2010, 04:57:36 PM

Matt, your symptoms sound similar to my 2 bean can failures, due to dying hall effect vane sensors.  The sensor is not too expensive to replace but definitely a job to do on the shop bench and not a roadside fix.  

Title: Re: So there I was in the dark, no shoulder, pushing..
Post by: Matt Chapter on November 18, 2010, 10:26:10 PM

Finally had a chance to post the resolution.. apparently the loose nut fairy had been hanging around my R65 quite a bit. (You know the guy.. cold beer in one hand, wrench in the other, dumb look on his face..)  The battery connector had come loose, but even after that no dice.  I took the tank off and the ignition coil was very loose in the mount.  I just tightened it all back up and bingo! back in business.

Now that it's reasonable temperatures in Texas I'm loving the commute again.