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Serious Thumper 2005 No Login
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Professional "scooter trash".
Posts: 5207
Rosemark TN
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It's a modern (post 1969) manufacturing short cut. The cam bearings in my 1963 Honda 250 are huge. Great big caged ball bearings. It has 3 of them... One on each end and a center bearing, but, it is a 2 piece cam. Really easy to get out of phase if you don't pay attention during the install.
Even the bikes that metric owners love to hate (HD) have roller rockers, roller lifters, easily adjusted valves (self adjusting, hydraulic roller lifters on newer ones, adjustable pushrods on real ones)...
Entry level bikes (bargain basement throw away units) like the Savage, 600 Shadow, both sizes of Rebel, etc. are built to be tossed in favor of bigger and better within a year or two. So the factories switched to 1880s cam seats... think I'm kidding, cast in cam supports go back to the early days of steam, but had external oilers.
The cam really ought to ride in replaceable inserts like a car engine. Too much like right, keeps people on beginner bikes too long.
15W40 and a decent idle speed, they'll last at least 100k miles, the old forum one bike lasted well over 200K miles.
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