If the bike has no O2 senssor (lamba sensor is another name for it) then you'll be fine on leaded. I've run avgas (about 10 times the lead of leaded petrol) on the K75 for quite some distance so the fuel injection does not mind it at all. It only took 20 kms of running to get that white/grey exhaust colour back too.
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Regards Frank Warner
motorcycles BMW R80 G/S 1981, BMW K11LT 1993, BMW K75 G/S
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