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Thank you all for your advise, I have replaced the mid shafrt bearing and housing, Have checked the bedplate bolts, The vibration seems to be coming from the engine not the pump, The vibration starts just above idle all through the rev range but feels worst at mid throttle.

I have an SXR 800 hull with a 750 sxi engine bored to 800cc , Factory dry pipe, ADA head. I have a vibration all through the rev range. The engine was rebuilt about 15 hours ago. The ski has a new solas prop, drive shaft, pump bearings, bulkhead mount and bearing, coupler rubber. the problem...