Hi All,
I removed the carbs on my stock 1991 NT650. I can now see into the intake manifold on both cylinders. I see two valves in both the front cylinder and rear cylinder. There is a ridge of cast aluminum between each pair of valves. Both the front and rear cylinders have a crack in this ridge that runs across the ridge from one intake valve recess to the other. The crack does NOT appear to extend down into the valve seats.
That BOTH cylinders show this crack suggests that it is a common defect. Has anyone else seen the crack? Does the crack cause problems?
Thanks!
I removed the carbs on my stock 1991 NT650. I can now see into the intake manifold on both cylinders. I see two valves in both the front cylinder and rear cylinder. There is a ridge of cast aluminum between each pair of valves. Both the front and rear cylinders have a crack in this ridge that runs across the ridge from one intake valve recess to the other. The crack does NOT appear to extend down into the valve seats.
That BOTH cylinders show this crack suggests that it is a common defect. Has anyone else seen the crack? Does the crack cause problems?
Thanks!
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