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If the oil is too thin, that may be a cause or if the oil has cleaned the carbon deposites off the piston rings because it is a detergent oil, that may cause it. Check the oil that was used and check the crank case breather is not blocked building up pressure in the cranl case with obvious consequences.
Use 10/40 synthetic or semi-synthetic MOTORCYCLE oil. Don't be tempted to use slightly cheaper car oils as these are designed for use with dry clutches and contain 'friction modifiers' which make the oil slippier to help the car engines run more economically. These will make the clutch slip on powerful bikes which have a 'wet' clutch running in a bath of engine oil. You can get away with car oils in less powerful bikes.
try charging up the battery, the starter needs around 60 amps to turn over compared to the lights that only need around 5 amps, maybe it just doesnt have enough power to turn it over... hope this helps