Bike crank but wouldn't start.

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Thanks for the info popgun, very precise, zirconxi you have a good look at that part, the first time i measured it i could not get a reading myself.
The contacts of the coil connector are a bit far into the plug housing and only after using some smaller probes was i able to read the 487 ohms.

There must be a lot of small wire in that sensor to produce 500 ohms.

If the sensor is actually broken that explains the problem, did you actually charge the 3 year old battery before the last test?