You can convert the metal-flywheel 066 to the 064 flywheel/starter/brake flag
if you have the 064 flywheel that's timed for the non rev-limited ignition, but you can't just swap some parts.
If you see an original 064 and it has this sticker on the air filter cover, that's indicative of a saw with the rev-limited flywheel and ignition.
This is the low-profile air filter cover Kevin is talking about. If you see an original 064 with this cover, it indicates an early saw and those are the best to get. They had hotter porting, non rev-limited ignition and flywheel,
and the most fuel-generous carburetors.
The main changes to the 064 were:
Switching from the low-profile air filter system to the HD filter base, filter, and cover
Bing 49 Carbs on the early saws, swapped over to Walbro WJ-6/10/35/65
Three variations of clutches
Two variations of mufflers - one flat bottom and the newer one as an arched bottom (if you want to use the newer arched-bottom muffler with the early cylinder, then you need the exhaust spacer 1122 145 1200)
Early non-clear gas tank, and later clear gas tank
Early thick intake boot with narrower throat at the airbox and no intake sleeve, and later "improved" intake boot with intake sleeve and washer
Early and late air boxes, each of which is only "compatible" with the early and late intake boots
Early non rev-limited ignition (1122 400 1300 "Dogleg" coil) swapped to CDIC rev-limited (1122 400 1303) ignition, then swapped to the "universal" 0000 400 1300 non rev-limited ignition
Early non rev-limited flywheel (1122 400 1201) swapped to rev-limited flywheel (1122 400 1204) compatible with CDIC coil, then swapped to "universal" flywheel (1122 400 1203) with dual key-ways
Three variations of cylinders: early ones made by Kolbenschmidt, later ones made by Mahle, and still even later ones made by Gilardoni. The early saws usually came with the Kolbenschmidt jugs which were good runners.
Is that enough to make your head explode?
