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When I first installed a cam in a 750 with two S's on the drive side exhaust lobe, I did not have adequate crank case ventilation since the cam did not support a timed breather. That really messed with the top end. No amount of carburetor tuning made a difference. Probably has nothing to do with it though, because I don't think I could reach 6000 RPM when crankcase ventilation was poor. Maybe check whatever PCV (breather) plumbing you are running anyway?

[QUOTE="Schwany, post: 647235, member: 10834"] When I first installed a cam in a 750 with two S's on the drive side exhaust lobe, I did not have adequate crank case ventilation since the cam did not support a timed breather. That really messed with the top end. No amount of carburetor tuning made a difference. Probably has nothing to do with it though, because I don't think I could reach 6000 RPM when crankcase ventilation was poor. Maybe check whatever PCV (breather) plumbing you are running anyway? [/QUOTE]

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