100 CC 2 stroke enough?

About using jet ski motors to power small boats

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100 CC 2 stroke enough?

Post by Primadeluxe » Tue Mar 25, 2008 2:18 pm


I'm an owner of a self-built Minimost from Amsterdam, The netherlands and very pleased to find a forum where I can go with my questions ...

As said, The Minimost has to be powered. At this moment it runs with a 1969 10 hp Mercury. It's sort of overpowered. From halfway throttle up and more gives only a lot of noise but little more RPM's or speed.

So, I wonder how that works ... if you don't go for torque (a kick in the back) but more for top speed after 20 seconds of full throttle. Will a good running 100 CC 2-stroke (kartmotor) with 10.000 RPM's be benough to power up a jet pump?

And then the real question ... what kind of pump?

I see the pictures of fusion between a jet-ski and the minimost. But that's a lot sturdier stuff, made for 550 cc or so. I wonder if there's a possibility to find a pump somewhere between RC-stuff and the Jet-ski. For high RPM's!

Well, thanks so far for reading and happy boating

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Post by dx787 » Thu Apr 03, 2008 2:42 pm

Good question, I was wonederin the same thing and would love to know the answer....sorry cant help tho.

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Location: Massachusetts

Post by marksa1458 » Fri Apr 04, 2008 7:29 am

Primadeluxe - I'm not sure how you would convert a outboard motor setup to an inboard without a complete re-design. You would need to rework your boat extensively and fit in a tunnel and engine.

You may have better luck with a different prop and maybe a rpm limiter...
Both the below websites detail my build progress.


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