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Jetbore Engineering Limited

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Jetski
Hopefully your jetski will perform well and provide you with a very enjoyable season.  Unfortunately things can go wrong and even though you have charged the battery you may be faced with a loud clunk when you turn the key, don’t keep trying to start it, the problem may well be that water has seeped into the bores and/or crank cases while the ski has been standing. This then corrodes the bores and crank bearings and locks the engine solid. Jetski Image
 If you keep trying to start it you may damage the starter gears, older seadoos are particularly prone to this problem.  If this has happened take the plugs out and see if you can turn the engine over by hand or gently with grips on the drive coupling at the back of the engine.  If you can’t or there is lots of resistance you will have to strip the engine.  See services page.
Top Tip!
With an older ski if you have left your ski in the water for more than a couple of hours or for more than a few days on the trailer, before you start the engine take the plugs out and ground them, then whiz the engine over on the starter with the throttle open.  This will blow any water which may have accumulated in the engine out through the plug holes.  It is a faff I know − but if you don’t and there is water in there a hydraulic lock can occur and bend the conrods, hole the crank case or even blow the cylinder clean off the crank case and through the seat (a Polaris speciality).  If we are carrying out a repair for you we will always be happy to give any advice.