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Sounds like your pinion/bendix gear is not reliably extending fully to engage the flywheel. There are three common causes of this: (most common) Dried up grease or dirt on the threads of the starter shaft and the pinion/bendix. Failing overrunning/one-way clutch in the bendix
replace starter.
12 volt battery should be 12-13.2 volts dc normal and 14.5-14.8 vdc at rpms if you only get 8.5 vdc then the charge system ( alternator /stator)is not working or the voltage regulator needs replacing
if the center electrode is burning away, it indicates that the mixture is too lean at high rpms or load
check adjust float level , clean out main jet or fit correct jet size
if 2 stroke check for leaking crankshaft seals
change the heat range of the plug to as cold as possible
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