Its commonly accepted that fully synth oil is not ideal in bikes due to the wet clutch.
Having said that I know many people that use it with no ill effects.
May be a different story in a bec with a blown Bird engine...
John
What is a good quality oil for a blackbird with a blower on.
any fully synthetic superbike oil
Opening a worm full can there...
Its commonly accepted that fully synth oil is not ideal in bikes due to the wet clutch.
Having said that I know many people that use it with no ill effects.
May be a different story in a bec with a blown Bird engine...
John
thank god for dry sumps or it probably would
CASTROl superbike Oil R4
Yep Castrol R4
Castrol R4 superbike
The best there is
Motul 300V
Rock Oil Synthesis
There are various options, but make sure it's a bike oil and NOT a car oil. Car oils aren't designed for wet clutches - that's where
the problems arise.
Synthetic is the stuff you want - the only problems arise when using it in a brand new motor as it can mess up the running-in process. It's just
too slippery! 
quote:
Originally posted by spunky
Opening a worm full can there...
Its commonly accepted that fully synth oil is not ideal in bikes due to the wet clutch.
John
quote:
Originally posted by ChrisGamlin
Its a common misconception to be honest, rather than commonly accepted. Fully synth is absolutely fine for wet clutches as long as it meets the required rating for use with wet clutches (SG rated I think).
Ive used R4 and Redline without issue for 4 years, both are good.