Starts slow

[VRR.DYNDNS>BIZ]

Yes, it could be a starter issue, but you want to check the easy things first. Try jumping directly from the battery to the starter. If it spins faster, then you know it’s not the starter. Could also be valve clearance is not correct.

Valves wear and a decompression system then does not provide compression relief, thus this is what he referes to on valve adjustment.