1 Flowmeter restoration Tue Mar 29, 2016 5:59 pm
Beamer
Platinum member
I have found out the reason my K100 was a slug and only accelerated like a family car: the air flow meter is worn out.
It still has pretty good top end power, it just take forever to get there.
while searching another problem I started measuring and checking everything electrical and found the resistance of the flow meter was all over the place. Totally inconsistent and up and down radically as the gate is slowly opened.
I ended up taking the lid off and found that the carbon track is fairly worn Not too suprising with number of times the air flow must have changed in 20 odd years of service !!.
I have to say these are beautiful instruments but the carbon track is certainly the weak link. I have tested at least four second-hand ones and they are all in about the same state ( or worse ).
I rang the local BMW dealer and they told me it was 600 euros for a new one. Well that's about half what the bike is worth so pretty disproportionate.
I was expecting to buy just the little ceramic plate with the laser trimmed resistors and the carbon track ( the rest is perifect ) but they will only sell me the whole sealed unit with the ali casing and all.
Does anyone have any suggestions on how to refurbish / fix it , or now of anyone providing such a service?
TIA.