Actually pretty straight forward, follow what the polls have shown...
1) Engine - 100% Synthetic, why? Lower friction, less heat and wear; less impurities means less contaiminants; higher temperature tolerance and endurance. Enter Mobil I V-Twin, AMSOIL 20/50 and others; just say no to HD Syn3 is not 100% Synthetic anyway, and why help Hugo Chavez and his CITGO company stock with his anti-USA rhetoric?
2) Tranny - Gear oil to prevent splashing and stay in gears and rubbing surfaces; since not as excessive temperature changes viscosity is not so much a problem, just has to be thick enough to stay in place. Hypoid gears have more meshing surfaces and needs GL5 rated or better. Enter Spectrol, Bel Ray and others!
Oh...if there is a clutch and chain in there like the Sportster, why risk slippier 100% synthetic and shorten clutch pack life...just use 85W Primary Chaincase/Clutch Lube...high performance metrics have all in one and NEVER use 100% Synthetic to save clutch life.
3) Primary - hey there is a chain in there and cavity is small, what is all the oil slinging around in there; lube needed but only keep the chain surfaces lubed and clean...why not use inexpensive but durable Formula + after all isn't simplicity nice and save money at the same time?