Yamaha M1... what are these?


Phantom Rider
Elite Member
I saw this awesome pic of the M1 in the retro colours today:

However, when I zoomed in I saw this...what is it?



Junior Member
Elite Member
I have seen a similar one(near the rear shock) on my friend's BMW S1000R - it looked like a sensor for the semi-active suspension, although that looked like a fixed unit, not the telescopic looking thing on the M1. This one might be used to sense suspension travel?

I used to believe they were some kind of brake lines, the above pictures make it clear now. Thanks.


Professional test dummy
+1 with hellgate.
im sure they give feedback for hard acceleration/braking and im sure aide in wheelie control BlahBlah