Engine tickover 'lumpy'

[Demongroover]

Got the bike out last week to get to work.
The bike started and ran ok, but at tickover it was 'hunting' up to 1500 rpm.
The needle kept flicking up from 1000 rpm to 1500 every few seconds.
Any suggestions? Any common problems?

 

[Barrmill Biker]

That's odd

That's odd as mine has started doing the same thing and has cut out
even when up to running temp.

Have stooped the bike switched off the engine and restarted and some times it's better
nut not always will be interested to see if any one has any suggestions.

The bike is a gs1200 05 plate

 

[Engineer]

Got the bike out last week to get to work.
The bike started and ran ok, but at tickover it was 'hunting' up to 1500 rpm.
The needle kept flicking up from 1000 rpm to 1500 every few seconds.
Any suggestions? Any common problems?

Between services (every 6,000 miles) I have noticed that they 'go off tune a bit' - this is most noticeable when starting on cold mornings. Although once thoroughly warmed up the lumpiness tends to reduce.

If the bike is then carefully serviced i.e. throttles balanced and valve clearances accurately set, then you come away from the dealer with a much smoother engine - BUT not every dealer is good at doing this!

Having said all that I have never had 'hunting' from 1,000rpm to 1,500 rpm.

 

[Pukmeister]

Happened to mine twice in four years. Cured itself on shutdown/restart. I'd suspect an unhappy CPU or minor software error in the engine control unit BMS-K probably due to a sensor input being out-of-range or something.

If it restarts and runs okay, don't panic. If it fails to run nicely after restart, try a recharge on an Optimate or similar to top up the battery then have another try.

 

[Sixpack]

I had a similar problem with the revs hunting turned out to be the sensor on the exhaust. The other symptom I had was a noticeable increase in fuel consumption.

 

[Tomcat]

Try resetting the throttle position sensor - engine off, ignition on, fully open the throttle 3 times, then ign off. So simple it's worth a try - and it fixed a problem of misfiring on a friend's R1200S

 

[Demongroover]

Try resetting the throttle position sensor - engine off, ignition on, fully open the throttle 3 times, then ign off. So simple it's worth a try - and it fixed a problem of misfiring on a friend's R1200S

Thanks, I'll try that.



It does sound like a sensor / software type problem.