K11 Owners Group

gpzoduibh · Posted: Mon May 25, 2009 6:23 am Post subject: Idle rising with temp.

Hello all , was out yesterday for the first really nice day this summer for a good spin however at one stage I got stuck in a traffic jam and the K engine got fairly hot the idle started climbing as it got hotter , up to about 2000rpm at one stage Shocked

and dropped back to normal once I got moving again , the fan did kick in and the gauge went slightly high but not overheated any ideas ?
Regards
Bill
_________________
1995 Grinnall Scorpion III(1990 K100 16v motor)
2010 KTM 450 EXC
Moto Guzzi V50 powered hovercraft !
1989 K100RS (8V) special edition
1974 Yamaha DT360
1972 Sanglas 400 T
1980 Yamaha XS110-Watsonian Palma sidecar
1966 Bridgestone 175 dualtwin
1980 BMW R100RS
1979 Bultaco sherpa T 350
1979 Yamaha DT175MX
1990 Honda XR250R

tmoons · Flying Brick Rider Joined: 09 Oct 2008 Posts: 161

first thing that came to mind is a vacuum leak... (something expanding as it heats up and opening a leak).

second thought... a sensor switch?
but the third thought kinda blocked that.... Wink

i would not know what sensor would be switched with what other one to affect running of the bike in that way...... tempsensor switched with another one... but can't think of any other one?

Scott_Anderson · Posted: Mon May 25, 2009 9:23 am Post subject:

I presume that this is your Scorpion?
This is a guess on my part but, fuel fumes getting to the air intake when setting still?

I've had my K setting still many times this last month in traffic. The engine temp did rise and the fan came on but the idle never increased.
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gpzoduibh · Posted: Mon May 25, 2009 10:39 am Post subject:

Thanks for the replies Tmoons and Scott its in the Scorpion alright its a 1990 K1 engine with motronic and TPS and no lambda sensor I have had it get hot before but never had the idle speed rise like this I only had rebalanced the throttle bodies the night before and it is running smoothly and strongly but this rise in idle is new I might try Tmoons vacuum leak idea but the fact that the idle dropped again after a run to drop the temp a bit has me confused. The air box air temp sensor connection is a bit gammy would this have this affect if it went open circuit ?
Regards
Bill
_________________
1995 Grinnall Scorpion III(1990 K100 16v motor)
2010 KTM 450 EXC
Moto Guzzi V50 powered hovercraft !
1989 K100RS (8V) special edition
1974 Yamaha DT360
1972 Sanglas 400 T
1980 Yamaha XS110-Watsonian Palma sidecar
1966 Bridgestone 175 dualtwin
1980 BMW R100RS
1979 Bultaco sherpa T 350
1979 Yamaha DT175MX
1990 Honda XR250R

tmoons · Flying Brick Rider Joined: 09 Oct 2008 Posts: 161

did you find the solution?

gpzoduibh · Posted: Fri Jul 17, 2009 3:45 am Post subject:

Hello Tmoons we have run out of warm weather for the last while you must be getting it over there in Holland ?
The scorpion cooling system is a bit tricky to bleed and requires putting axle stands under the balance point and rocking it backwards and forwards Rolling Eyes

to get the air out , I reckon I still have a lot of air in there as I am still topping up but I dont have a leak , when we get a warm day next Cool

I will report back.
Regards
Bill
_________________
1995 Grinnall Scorpion III(1990 K100 16v motor)
2010 KTM 450 EXC
Moto Guzzi V50 powered hovercraft !
1989 K100RS (8V) special edition
1974 Yamaha DT360
1972 Sanglas 400 T
1980 Yamaha XS110-Watsonian Palma sidecar
1966 Bridgestone 175 dualtwin
1980 BMW R100RS
1979 Bultaco sherpa T 350
1979 Yamaha DT175MX
1990 Honda XR250R

tmoons · Flying Brick Rider Joined: 09 Oct 2008 Posts: 161