At 63 I whip & rip every Sat & Sun on one of my 200 two 300 mi loops from sea level to10,000 ft elevation and back down, on a 1993 Honda CBR 900RR that this day 8/9/04 has 148,883 mi on it, I just spooned on my 26th set of Dunlop tires, and did the 44th oil change last week, this bike is bullet proof, never been apart, the valves have stayed at the same setting after the 35,000 mi one and only adjustment (owned bike 7 yr).
This bike is redden like a 250 MXer, pinned all the time, and loves the 7 to 11,000 power curve zone, always going 115-145mph, this bike gets no mercy, only good maintenance,3,000 mi oil changes, 9,000mi filter, all swing arm and delta link shock pivots have zirk fittings, this makes for good working Race Tech suspension
The main reason for the longevity of this classic machine is DURALUB oil additive.
I use 6oz with every 4qt of Honda 10-40, with a magnetic oil drain plug.
I also apply Duralube on the chain with a ˝ inch wide art brush when the chain is hot after a ride, this takes only a few minutes, and worth the effort, you will never have tight spots in your chain, I can get 35,000+ mi out of a chain & sprocket set.
For wheels I mix a small amount of Duralub(2drops a spoon full) with wheel bearing grease, pop seals out and repack bearings every 4th tire change.
Funnel some in to the clutch cable, wow magic clutch pull and it will last a long time.
A low miles none ridden bike (wife whipped workaholic poseur owned) is prone to pitted shock shafts & fork tubes, endless electrical problems because of the battery always at a discharge and maybe a rats nest in the air box.
Bottom line> Inline 4s take a pounding for a long time, just keep’em reved dude. and if you don't drink or smoke you will last a long time also.
“A good bike is a hard ridden bike”
"A good person is a good moral choice person"