1 Erratic revs 1984 BMW K100 RS Sat Jun 05, 2021 12:55 pm
WayneD
active member
I've owned and ridden my bike since last March 2020 and have only put about 1,500 miles on the clock, previous owner had told me that he'd done a full service and ridden her back from Heinsberg in Germany at the end of January 2020.
So my bike was in storage for 6 weeks over the winter,dry and cool lockup.
She started up first time when I took her out , rode her home , rod her her around for a week, refuelled her and rode 8 miles parked up at a friends for a cuppa, came out 3 hours later... started straight away... 300 yards down the road the revs dropped , I dropped a gear, revs still dropping, dropped into 3rd ... then 2nd throttle wide up ... bike is kangarooing down the street with erratic revs...managed to get home 3 miles.
went online checked here and other places for symptoms....
decided to check air/ fuel/ electrics ....problems I found
* spark plug 1 showed soot
* Spark plug 2 plug cap was damaged not connected to spark plug
* Spark plug 3 wet unburned fuel
* Air filter was grey with muck
I replaced all the Spark plugs , 3 of the Spark plug caps and the air filter
fired her up and ran nicely ....... went out yesterday battery flat... battery on charge overnight , wouldn't turn over today... hooked her up to spare battery... started and the problem is back ... any suggestions ?
i've put a link to a video of what she sounds like .... during the video the rev surges and drops are not me over revving the throttle
https://drive.google.com/file/d/1ygBt9YAj2iyiwDLspKxgwqCfHw6TBPyv/view?usp=sharing
So my bike was in storage for 6 weeks over the winter,dry and cool lockup.
She started up first time when I took her out , rode her home , rod her her around for a week, refuelled her and rode 8 miles parked up at a friends for a cuppa, came out 3 hours later... started straight away... 300 yards down the road the revs dropped , I dropped a gear, revs still dropping, dropped into 3rd ... then 2nd throttle wide up ... bike is kangarooing down the street with erratic revs...managed to get home 3 miles.
went online checked here and other places for symptoms....
decided to check air/ fuel/ electrics ....problems I found
* spark plug 1 showed soot
* Spark plug 2 plug cap was damaged not connected to spark plug
* Spark plug 3 wet unburned fuel
* Air filter was grey with muck
I replaced all the Spark plugs , 3 of the Spark plug caps and the air filter
fired her up and ran nicely ....... went out yesterday battery flat... battery on charge overnight , wouldn't turn over today... hooked her up to spare battery... started and the problem is back ... any suggestions ?
i've put a link to a video of what she sounds like .... during the video the rev surges and drops are not me over revving the throttle
https://drive.google.com/file/d/1ygBt9YAj2iyiwDLspKxgwqCfHw6TBPyv/view?usp=sharing