Well picked the ski up from Taka yesterday and managed to get out for a quick ride this morning. So far all seems to be going well. Ski felt strong again and firing on all cylinders. Even after the ride the spark plugs are still fine, well loads better than the first pic on this thread. After a thorough going over by taka found a few other concerns which were have now been sorted. Only thing left is to replace the impellor down the track as he said he noticed some damage on it and also some cavitation on the watertest. Any suggestions on a good aftermarket impellor for these things?