Met up with a 2007 R1200GS a few months ago standing by roadside. The owner had a set of throttle cables made up by a company that makes up all sorts of cables… as per sample. The right hand throttle cable’s outer was so long that it prevented the right hand throttle body butterfly valve from closing at idle. It must have been approx 30% open when against the stop. Cut the outer until the throttle valve closed. Did not sync the TB’s as it was a roadside breakdown.
Bike came in now with reports of misbehaviour i.t.o. ‘flat spot when cold’, ‘poor performance’ and ‘high fuel consumption’.
Ran and recorded data in CSV file. Worked through data and only abnormality I see is the following…
Cylinder head 1, the cylinder head temperature is at 300 degrees C on cold start and remains there throughout the run. When engine speed is taken up to 1200 rpm or higher, Lambda sensor 1 voltage remains high (rich mixture?) without fluctuating.
Cylinder head 2 seems ok in all respects. Temp starts off at 43 degrees C and rises in parallel with the engine temp reading, although approx 20 degrees C lower, which makes sense to me.
Is my assumption that it is caused by either a failed temperature sensor unit, or more likely a short of the sensor unit’s wiring to earth correct? Also that the recorded high temperature causes the high and steady Lambda sensor 1’s voltage?
All temperature readings (Cylinder 1 and 2 and Engine) was scaled up by factor of 10. Lambda sensor Voltage scaled up by factor of 100,000.
Sitting on the bike, which is cylinder 1? Left or right?
Any suggestions, assistance welcome please.