
11 Mar 2022
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Registered Users
Veteran HUBBer
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Join Date: Feb 2012
Location: Milan, Italy
Posts: 627
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Quote:
Originally Posted by pete j
Hi EZRA HARDY,
You have the classic early XT600 engine failure. Smart of you to find it, many don't.
It is the failure of 5th gear which provides the particles that destroy the oil pump leading to loss of oil pressure with eventual seizing of the piston in the cylinder.
Yamaha worked on this problem over the years but only with the 1st 660 3YF models did they make a wider gear that was also fitted to 4PT 600s.
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Indeed, the elephant in the xt600 room that no owner likes to talk about. BTW, the three XT660 engines i cannibalized for parts for my Supermono racer also had shot 5th gears.... improved or not, looks like the problem was not entirely solved in the water cooled 5 valvers...
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