hi i have bought a secondhand ski.a seadoo Rx2001 951cc..the problem is that the drive shaft has stripped in the impeller and seems to only have engaged the first 10mm of the impeller...have gone to the trouble to buy new parts for the pump, bearings ,seals and a new impeller and drive shaft...have put new rubbers on both ends of the drive shaft had mate of mine put it all together and every thing seems tight and in place...with the pump and all parts..... but we pulled it down to check the shaft length ,,if it was going into the impeller ,,but it still is only going into impeller 10 mm..the only thing we can think of is if the motor mounts could move...but motor mounts are fine.and back engine brace is ok as well..is there any way that the engine can move forward ....and the pump unit went together real well and there was no movement when put together...have takin it for a test ride but when we pulled the impeller and shaft out to inspect it. the shaft is only 10mm in...so we are stumped to why the shaft seems short...have the right shaft part number and such so no luck with wrong part...so any help would be greatly appreciated cheers