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Hi!!!
AFAIK , if a bike has not CAT (easy to see if it has a Lambda probe or not @ the exhaust) ... then it will run BETTER , for longer , with less valve wear , and less detonation on PREMIUM LEADED , especially in those hi-temperature environments.
UNLEADED's only reason to exist is to protect petrol-injected cars' cathalysts , whoose expensive platinum alloy would be "poisoned" - rendering useless- with any lead .
Having said that , and for a "uncatalyzed" engine such as most overlanding motorbikes have ... the safest , cheapest ,etc.. fuel is LEADED !.
-pls note that small airplanes (Cesnass , etc) are essencially same design /techhnology/construction that air-cooled motorbike engines ... and run quite happily with super-leaded petrol
Leaded fuel has another's advantages , such as "self sealing" action in fuel screw fittings (producint that "locking" effect in fuel system related nuts), electric fuel pumps bearing lubrication ,
-let alone the valve seat problem -.
On top of that , -apparently - leaded's exhaust smoke is surprisingly "safer" to breathe that the new "unleaded" octane boster , if it werent for the catalyzer.
Cheeeers.
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