As long as its a motorcycle oil, and you precisely match the SAE spec, and exceed the API spec you will be fine.
SAE spec is like 10W40 (or whatever yours is - RTFM), so you use the same or close to it.
API spec is like CE/SF (C is for compression engines, S is for spark engines) so you can use an oil that is CF/SG API-rated in your spark-ignition engine as G is higher-rated than F.
In my opinion, a thinner (lower SAE spec) is better for high-revving engines coz it doesn't bind and wedge in the high-speed areas of the engine (like rings and big ends) and deprive them of lubricant, hence I tend to use 10W30 where I can, or one SAE level lower than specified.
Steve
"I am a licenced motorcycle instructor, I agree with dangerousbastard, no point in repeating what he said."
"read what Steve says. He's right."
"What Steve said pretty much summed it up."
"I did axactly as you said and it worked...!!"
"Wow, Great advise there DB."
WTB: Hyosung bikes or going or not.
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