1 Yet another rough running / bogging down thread Tue 13 Oct 2015, 19:44
KPilot
active member
Sorry to post another thread on this subject, but I did not want to detract from the specific questions other owners have asked.
Yesterday I was riding from Canberra ACT to Bowral NSW (in Australia). I filled up in Canberra, and about 140km into the ride, the engine started to bog down. I had to increase the throttle position to maintain speed. The engine also felt like it was intermittently stopping/starting. I am not sure if this is a vital piece of the puzzle or not, but it was also about this time that it started to drizzle/very light rain. There was the odd couple of drops of water falling behind the fairing (K100RS 1989), but certainly nothing looked like it was getting drenched. I was wearing a summer jacket and kevlar jeans and did not get wet.
I was concerned that the engine would stop when I stopped the bike, however, when I stopped, the engine would idle normally. The engine would start to complain and bog down when the RPM increased. When it was running, it felt slightly rougher than normal, but not real bad. I managed to limp home the last 30km or so.
I was tired when I got home, so did not check straight away, but an hour or so later when I went back to the garage, I pulled off the coil cover and everything looked dry. I did spray a little WD40 around the coil connections and the throttle position sensor plug (but did not take anything apart).
Today (dry and almost sunny) - it rides fine.
From my reading, the issue could be caused by a number of problems:
Leaking air boots etc.
Fuel issues - contaminated filter etc.
Electrical problems.
My gut feeling is it is electrical, but asking for advice. This is a K100RS 1989. It is new to me with 134,000km on the clock. I bought the bike because I had one briefly in the 90's and miss it! However, I am not very familiar with the BMW or K systems. I have just finished a nut and bolt restoration of a 1982 Honda CB900F, so I am reasonably comfortable having a go at things myself. I suspect it will be wise to completely replace all rubber airboats hoses etc. Is there a link to a comprehensive parts list for this? I am not asking because I am lazy, it is just that if you forget something, freight costs a fortune for things to come to Australia. Next issue is electrics. I have heard that it is good practice to pull apart all connectors, clean and reassemble with dielectric grease. I know this is going to sound dumb, but I have not seen the type of connectors on the BMW before with the wire retainer. How do you undo this? I don't want to break a connector.
Lastly, any clues as to what the likely diagnosis is?
Thanks for your help,
Chris
Yesterday I was riding from Canberra ACT to Bowral NSW (in Australia). I filled up in Canberra, and about 140km into the ride, the engine started to bog down. I had to increase the throttle position to maintain speed. The engine also felt like it was intermittently stopping/starting. I am not sure if this is a vital piece of the puzzle or not, but it was also about this time that it started to drizzle/very light rain. There was the odd couple of drops of water falling behind the fairing (K100RS 1989), but certainly nothing looked like it was getting drenched. I was wearing a summer jacket and kevlar jeans and did not get wet.
I was concerned that the engine would stop when I stopped the bike, however, when I stopped, the engine would idle normally. The engine would start to complain and bog down when the RPM increased. When it was running, it felt slightly rougher than normal, but not real bad. I managed to limp home the last 30km or so.
I was tired when I got home, so did not check straight away, but an hour or so later when I went back to the garage, I pulled off the coil cover and everything looked dry. I did spray a little WD40 around the coil connections and the throttle position sensor plug (but did not take anything apart).
Today (dry and almost sunny) - it rides fine.
From my reading, the issue could be caused by a number of problems:
Leaking air boots etc.
Fuel issues - contaminated filter etc.
Electrical problems.
My gut feeling is it is electrical, but asking for advice. This is a K100RS 1989. It is new to me with 134,000km on the clock. I bought the bike because I had one briefly in the 90's and miss it! However, I am not very familiar with the BMW or K systems. I have just finished a nut and bolt restoration of a 1982 Honda CB900F, so I am reasonably comfortable having a go at things myself. I suspect it will be wise to completely replace all rubber airboats hoses etc. Is there a link to a comprehensive parts list for this? I am not asking because I am lazy, it is just that if you forget something, freight costs a fortune for things to come to Australia. Next issue is electrics. I have heard that it is good practice to pull apart all connectors, clean and reassemble with dielectric grease. I know this is going to sound dumb, but I have not seen the type of connectors on the BMW before with the wire retainer. How do you undo this? I don't want to break a connector.
Lastly, any clues as to what the likely diagnosis is?
Thanks for your help,
Chris