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Blown engine 717

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Rossgop

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My mechanic says i have blown the motor on my 1998 Sportster 1800. It has the twin rotax 85's He says they are 720 but the owner's manual says they are 717. He did a compression test and got 90 and 40 on the starboard engine. The boat sat in his yard since September 2010. I've only had it in the water for a week and gone through about $110 worth of gas. ($1.25/litre, 4 litres in a gallon) The fuel consumption is not unexpected.
He has offered me a few choices:
1) find a used motor. I feel I don't want a used motor because I know how Seadoo people run their crafts:Hard.
2) Rebuilt from the company he trusts. $1200 Canadian Dollars (at or above USD but that doesn't help us up here) If they can't use my core, there is an additional charge of $800
3) rebuild my motor (i'm done for the season anyway)
basically he said that $1200-1500 is the jumping off point. Things can go up from there if we discover new things.
4) dropping "something" in. I'm not a mechanic and I was already a little overwhelmed. The whole experience feels a lot like being told you need surgery: people at the marina and cottage consoling me and a lot of decisions to make from a low knowledge base.
I have no reason to doubt my mechanic. I bought the boat from him, winterize and store it there, he services it. I do take the attitude "tell me what I need to do." and hope they don't take advantage of me. I pretty much think I'll have them rebuild mine but... I'll spend the next week or two researching my options.
 
Number two sounds like the best option, also a very reasonable price, I'm assuming including labor.

Lou
 
It is a long weekend in Canada. (I think that has something to do with the timing of the blown engine.;) ) How much time is usually charged for a removal and reinstall for an engine? At $75/hr it adds up fast but everything is relative. Would 4 hours be reasonable?
 
I would get the carb rebuilt also since you are doing that. On a used engines they did use the 717/720's up until the 2005 if you can find a ski with a bad hull could be a good buy if it has low hours. Getting an engine already rebuilt is usally the cheapest if you aren't doing it yourself
 
Thanks for the tip on rebuilding the carb. I am rolling coins now so I can afford to go ahead with the repair. I am also planning on putting some funds aside for the port engine. I figure if one went the other may just follow along. But I'll keep my fingers crossed.
 
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