nothin to worry about, the light bulb thing however look at the dia. see which stator you have wattage wise. there were 6v, 2w and 3w oshram bulbs for some models, i ended up bringing the voltages and wattages to an electrical supply co. they have huge catalogs that list resistance factor as well as watts, volts.
dollars to doughnuts the bulb is not letting it idle or top out.
the scavenging is through the hole on the bottom of the jug, some peeps just block the decomp with a bolt, i just use a bic pen spring threaded on the orig pin. i think when its fully blocked the scavenging changes to loop scavenging.