It's all in your manual
You can use 1-40--20-50, but wait till you have about 3,000 miles on your bike to toss in synthetic...youhave a computer read the recommendations, read what the oil companies advertize...then go freeze or go outside and try burning some oil on some cheap pans from the salvation army or good will...I've been to the AMS-OIL challange and my second year I boutht my own oil to throw them off...I showed my dealership license and where I lived...so that they knew aht I wasn't a shoe in or doing a plug for them...my unopened oils with the receipt was poured into beakers with wooden stir sticks...Penzoil, Quakerstate, Castrol, Harley Davidson oil, Havoline, mobile 1, 8 total and then they put MY unopened bottle (not theirs) of oil into beakers and then poured liquid nitrogen from the tank into the stainless steel tray...AMS-OIL was the least like honey in the entire bunch...ten we went on break, in hte same room and watched as we ate sandwiches and drank coffee had desert all at AMS-OIL cost, and they took and put gas torches to the bottom of the beakers,,,I thought the glass would melt...but the oils turned black an done by one they reached flash point, boiling...except Mobile 1 and amsoil. I am NOT an AMSOIL dealer and that was 4 years ago. I still use amsoil in everything from my weedeater, car, truck, tractor...and I will until ther eis something else showing me an aviation oil used from over 140 degree surface temp runways to the negative degrees at flight altitiiudes---temperature extremes, that aircraft go through. You can believe in Valvoline, havoline, quaklerstate, Royal or even srtaight automatic transmission fluid...in an engine...Untill I see something better I'm sticking with AMS-OIL...