MOTOBRICK.COM
TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: kylemb on June 22, 2016, 12:16:40 AM
-
1985 K100 RT 70,000mi
So I had my airbox apart the other day while i was fitting new rubber inlets & cleaning the throttle body. I did this because it was running lean and too hot according to the plugs and the wd-40 i sprayed at the old inlets (could hear it burn in the engine).
The bike runs much smoother and has immediate throttle response whereas before it did not, but it's still not idling correctly and now its running rich. I've done TB adjusting, all hose's are good, fuel pressure, the whole 9 yards.
Then i remember two things:
1) when i lean the bike left the bike will begin to stall. when i lean the bike right the idle will increase...
2) when i had the Airflow Meter in my hand moving it around i noticed that the vane was verrry looose. slightly tilting the AFM would cause the vane to open.
i am going to investigate the vane tension further but it would not surprise me at the least to consider a 30 year old coil spring to loose its flex & if that is indeed the case; can they be reliably re-tightened ? considering everything i read suggests this thing is the holy grail of bmw factory adjusted, but that dont do nobody no good if ya spring is sprung! i read all kinds of 'laser calibrated' marvel of 80s technology but strap anything with tension on a motorcycle for 30 years and i guarantee you i'll start askin questions.
I've watched plenty of videos, whatda do? Tighten that sucker up and try to re-calibrate by lean drop method?
-
it would not surprise me at the least to consider a 30 year old coil spring to loose its flex & if that is indeed the case; can they be reliably re-tightened ?
If a spring has lost its resilience, I don't believe "tightening" it will help. There are several used meters on eBay right now. If you believe that is the problem, you could see if the numbers on your part match up with the parts for sale.