YES YOU CAN PUT A 900 IN A 1100 HULL THE 750.900AND 1100 ARE ALL THE SAME HULL JUST ALL HAVE DIFFERENT DRIVE SHAFTS 900 WOULD BE JUST AS FAST AS 1100 BAYME 5MPH DIFFERECNE IF THAT SO YES PUT THE 900 IN I WOULD ITS A MORE RELIABLE MOTOE THEN THE 1100 HAVE YOU TOOK APART THE 100 MOTOR IT MIGHT JUST BE THE PISTON AND RINGS WITH ABOOK ANYONE CAN CHANGE PISTON AND RINGS GOOD LUCK EMAIL ME WITH ANYMORE QUSTIONS
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