Daryl,

I just bought another 906. Same problem. Someone had been hitting the starter with a hammer and broken the magnets inside.

I sent the starter to a bloke near Gosford N.S.W who glued them back together for $80. Works perfect.

To check, remove the screws on the end of the starter and pay careful attention to the way it comes out.

If you need to remove the starter completely, remove the sub-frame & just pull everything apart to be sure, and rotate the large idler gear that engages the starter until you can see the bolt through the hole. There are 3 holes and they are all off-set.

before you replace/rebuild the starting motor, test your starter solenoid. it could be that your starter solenoid is bad rather than your starting motor. you can check this by following the positive lead back from the battery to the starter solenoid. from the starter solenoid there's a second wire going to the starting motor. by-pass the starter solenoid by making a connection, (with a wire or a screwdriver), from the spot where the positive battery lead connects to the starter solenoid and the spot where the second lead exits the starter solenoid going to the starting motor. if the starting motor turns over when you by-pass the starter solenoid than your starting motor is fine and all you need is a new starter solenoid. this is a much simpler and cheaper repair. good luck!