Too much - you will be able to buy the consumables (oil, petrol, oil filter, brake pads) on your tip .. no need to carry them! Just buy them at some convienent place .. Just like tyres ...
What you want to take is stuff that will stop you AND can easilly be replaced by you .. quickly. Stuff that takes time .. well while your taking the time the parts can be shipped to you. What stuff have YOU had fail and need replacing beside the road?
Me? Yes to the fuel filter (gets clogged with bad fuel and you can get that anywheres). A spare spark plug (two if you use different ones on a dual spark). Puncture repair kit. Spare fuses. Length of fuel hose. O rings for QD fuel connectors. Lengths of electrical wire, electrical tape, duct tape, bailing wire. Some nuts and bolts various...
I'd put the new alternator belt on a month before the trip. New tyres and brake pads.
Hand levers? On a boxer?! You'd be hard pressed to hit them on any fall...
Regards Frank Warner
motorcycles BMW R80 G/S 1981, BMW K11LT 1993, BMW K75 G/S