Cam position sensor output - for future reference

[ElMonkey]

I posted a message yesterday regarding what you should see from the cam position sensor when doing a static timing test. I found my answer so I thought I'd share it in case anyone else comes across the issue in the future.

I was doing a static timing test per the service manual/ECMspy instructions and was perplexed as to why the cam position sensor output would change state several times through each rotation of the cam - all of the documentation made it sound like you'd only see two transitions, one for each TDC of the respective cylinder stroke. So I thought maybe my cam position sensor/cable was busted. I continued to dig in today and found the answer in the service manual.

The cam position sensor straddles a rotator cup that's attached to the cam and the cup has six tangs on it that act to block the magnet field detected by the sensor. So for each full rotation of the cam you'll get six transitions of the cam position sensor.

I've still got a significant problem with my bike, but I can at least rule this behavior out. And maybe this tid-bit will help someone else one day…

 

[zollie]

Did you ever find the main cause of your problem? Mine is swinging over but not starting, got spark, buell, air, compression.. Going to Replace the CPS - not sure if it is the problem though.