Seadoo Speedster

This is my 1996 Seadoo Speedster, was running great last week I changed the batteries because they seemed weak and now it does not seem to remember the key. Got it to start once on the hose but it only works about one out of 25 times! I was planning to sell the boat because I hardly ever use it. So here it is, I think this is a simple fix but the mechanic who serviced it in the past has moved away. My loss!! Over all the boat is in good condition, seats need to be redone but I put hydro turf on them, quick fix. Everything else on the boat works fine CD player is new and speakers, trailer is in good shape but it will not adjust up and down, I just pick it up. Top speed is around 50 and it handles like a dream. Any questions call phone. The blue in the pics is actually purple. Thanks for looking!