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Old 02-04-2014, 08:07 PM   #76
tlub
Gnarly Adventurer
 
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Joined: Oct 2012
Location: Madison, WI
Oddometer: 168
Carbs and reliability

Well, my very small sample, from which one may or may not generalize is this: R75/5 carbs: (35 years, 180,000 miles) one choke gasket, replaced with homemade item, replaced floats with alcohol-proof set; replace diaphragms every ten years or so.
R90/6: 60,000 miles, 30 years (time off for young kids): Diaphragms only.
R69S: Only about 20,000 miles: Rebuilt carbs once in 30 years.
R50: Only about 10,000 miles. Rebuilt carbs once in 30 years. .
Honda 350 #1: About 8000 miles. Pinholes in float from corrosion, fixed on road and replaced later.
Honda 350 #2: About 25,000 miles. No carb issues at all.
Harley Aermacchi 250 SprintH: 17,000 miles. (yowza!) No carb attention. (but lots of other attention).
Carburetor breakdowns that left me stranded: Zero.
It's hard to improve on zero.

Don't ask me about aftermarket electronic ignitions, though. 4 strandings there.
Interestingly, I think I have had more car carburetor trouble than motorcycle carburetor trouble, even though I probably have more miles on bike carbs than on car carbs. Zero trouble with car FI, though.
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