Tickover issue.

[VAL. H.]

Now I've got this in the right thread



I have an issue with me Dakar.

I haven't had it long, and only done four rides on it. Two long A road and motorway rides 90mls & 130mls, one 60mls spanking session and one 10 ml off road.

My problem is that when the bike is traveling, the revs will not drop below 2200ish rpm. Just a moment after I stop the idle is down to 1500, and when reved drops back to 1500 as it should.

2200ish rpm is a little over 30mph in fourth or fith, making the bike very snatchy at this speed. When traveling off road in second or third gear I get the same reaction at around the same revs. It makes it a bit of a pain, fiddeling the clutch trying to keep it smooth.

After buying the bike, the first thing done was to change the oil/filter and air filter. These were not good 'thick black treacle and a half blocked air filter.
I then took it to NOG for them to plug it in to the diagnostic thingy to check for any issues. The only thing they found was that I had forgotten to reconnect the air sensor (Bless). With this reconnected, the bike should have then run normally. However, the over rev is still present 'Infact it's more prescent'.

Apart from this ideling issue the bike runs very well 'rather supprisingly' for it's 26000+ mls. If it helps it's a 2000 model on an X plate.

Any ideas is this going to get expensive?


Val.

 

[rc mad]

bloody hell, rev the thing will you Drop down to third for thirty mph, will be mucho better

2200 revs is to low for the bike, It starts to lug at those sorts of engine speeds and becomes snatchy. 3000 is the minimum engine speed I'll use when riding, it'll happily spend all day near the top of the rev range as well

 

[D6]

rc,s right, also is the throttle cable too tight?

 

[talltony]

As an anti-stall measure,the engine idle speed is controlled,in part,by the speedo sensor which keeps the idle high until the bike comes to a stop when it lets it drop to 1500rpm.

Tony

 

[rc mad]

That i didn't know. Learn something useful every day

 

[VAL. H.]

bloody hell, rev the thing will you Drop down to third for thirty mph, will be mucho better

2200 revs is to low for the bike, It starts to lug at those sorts of engine speeds and becomes snatchy. 3000 is the minimum engine speed I'll use when riding, it'll happily spend all day near the top of the rev range as well

All very well on tarmac, not so off road on a gentle trundle. Jill's 650 runs fine at 2000rpm ish and is much less flighty, as are all the 650s I rode at the off road schl, 'Been twice' not come across this on a 650 before
It's not a race bike so should have more torque at the low end.

On the road the engine won't allow the revs to drop enough for the bike to slow down to under about 25mph. If you let go of the throttle and the brakes as you slow the bike it will simply continue along at around 25ish mph. Err, no the throttle cable isn't sticking in its outer either.

rc,s right, also is the throttle cable too tight?

There is slack in the throttle cable, not too much though. I did have to reassemble the throttle because the previous owner put it back together with only half throttle capability. It took me a while to discover why it would only give about a cm of movement on the twist grip. I even thought it might have a ristrictor fitted. It hasn't

As an anti-stall measure,the engine idle speed is controlled,in part,by the speedo sensor which keeps the idle high until the bike comes to a stop when it lets it drop to 1500rpm.

Tony

Interesting. Is it known for the speedo sensor to be a problem in this way? Maybe through miss alignment or dirt/corrosion?

Cheers for the suggestions guys.

 

[AxeGrinder]

Dropping a tooth on the front sprocket will help you reduce your speed...

Makes bike better for off roading, and traffic...Keep the 16 tooth sprock for when ye wanna go touring...

Changing rear sprocket may effect speedo readings...

 

[Spout]

Changing rear sprocket may effect speedo readings...

Shouldn't do, as the sensor picks up wheel speed not engine revs. Sensor is on LHS of bike.

Val, check the sensor isn't damaged (although if the speedo's working then I doubt it), and that the specified gap is OK. If it looks worn you can build it up again with resin (this only protects of course).

Also make sure you don't start the bike with the throttle open at all, this does b*gger up the TPS and can cause funny running.

Can't remember if this applies to the 650, but if you disconnect the battery, reconnect, turn ignition on and twist the throttle from closed to fully open 3 times it sets the throttle parameters. Worth a try and certainly wont do any harm.

As talltony says the increased tickover was a mod BM introduced to stop the bikes stalling. I didn't get mine updated to this as I wanted max engine braking off road. Perhaps your dealer can retro fit the early software.

Good luck.......

 

[JohnP]

Had this issue with my previous 650.

First step, with the ignition on open and close the throttle fully three times without the engine running and then switch off the ignition. Had to do this on both 1150GS and 1200 GS's.

Second, when you start the engine, keep your hand off the throttle , just press the starter switch and let the engine pick up on it's own. If on start up, you open the throttle, the engine will race away at about 2200 RPM, exactly as what is happening to you.

Hope this helps.

 

[VAL. H.]

Shouldn't do, as the sensor picks up wheel speed not engine revs. Sensor is on LHS of bike.

Val, check the sensor isn't damaged (although if the speedo's working then I doubt it), and that the specified gap is OK. If it looks worn you can build it up again with resin (this only protects of course).

Also make sure you don't start the bike with the throttle open at all, this does b*gger up the TPS and can cause funny running.

Can't remember if this applies to the 650, but if you disconnect the battery, reconnect, turn ignition on and twist the throttle from closed to fully open 3 times it sets the throttle parameters. Worth a try and certainly wont do any harm.

As talltony says the increased tickover was a mod BM introduced to stop the bikes stalling. I didn't get mine updated to this as I wanted max engine braking off road. Perhaps your dealer can retro fit the early software.

Good luck.......

Had this issue with my previous 650.

First step, with the ignition on open and close the throttle fully three times without the engine running and then switch off the ignition. Had to do this on both 1150GS and 1200 GS's.

Second, when you start the engine, keep your hand off the throttle , just press the starter switch and let the engine pick up on it's own. If on start up, you open the throttle, the engine will race away at about 2200 RPM, exactly as what is happening to you.

Hope this helps.

Arr! thats how it's done. I know about this, but thought it was open the throttle once fully, shut, then start engine.

So open it slowly three times, then turn off ignition, and no throttle on start up.


I'll do that then tomorrow. Fingers crossed this'll sort it ready for the Hog Roast.

Cheers Val.

 

[Spout]

Val,

just read this on ADVrider:

"There is a sensor in the snorkle that measures ambient air temperature, at least there is on my '06. IIRC when I replaced mine it was about a $20.00 item from MAX BMW. When it went bad it caused my '06 to idle at higher rpm"

Might be worth rechecking yours.

 

[VAL. H.]

Val,

just read this on ADVrider:

"There is a sensor in the snorkle that measures ambient air temperature, at least there is on my '06. IIRC when I replaced mine it was about a $20.00 item from MAX BMW. When it went bad it caused my '06 to idle at higher rpm"

Might be worth rechecking yours.

Thats interesting. I'd forgotten to reconnect it when I did the service. NOG identifyed it on the dagnostic, and reconnected it. The tickover issue seemed to get worse, so I have been wondering if it is a chagerble item.


Cheers.