| Listed in parts books | Not catalogued by year yet |
EX CAM LATE 650 EXCHANGE
Exhaust camshaft for the later 650 twin, sold exchange, #19 grind noted on file.
This is an exhaust camshaft for the later 650 twin, listed here as an exchange item under part number 70-9989/WEB. The catalog record ties it to the exhaust valve train and notes it as a late-650 application, but beyond that our record doesn't spell out specific model years, so check it against your engine before ordering.
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The camshaft controls valve timing and lift on the exhaust side, riding in the crankcase and driven off the timing gears. Wear here shows up as noisy valve gear, lost performance, or uneven exhaust note, and a worn cam is one of the more common reasons a rebuild gets opened up.
This one is sold on an exchange basis, meaning your old core factors into the deal. The alias on file references a #19 grind, which is a regrind profile some owners specify for this cam - if you're chasing a particular grind, confirm that's what you're getting before you commit.
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