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1990 Chaparral 1900 SL Documentation

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Hey guys...new to boat ownership at any level, but just purchased a 1990 Chaparral 1900 SL this past weekend.   Its an old boat, but appears to be in great condition for its age.  Maybe I'll find out otherwise soon, who knows.  

Of course there are several minor things to work on:  Horn doesn't work, missing speedo sender, battery drains on its own, fuel gauge needle bounces, broken exhaust bellows, etc...

It has a 4.3 Yamaha engine and outdrive, which I understand are not made anymore.  I was told the engine is really a GM engine with some Yamaha "stuff" added.  

What I'm really looking for is how to identify what equipment came on this boat and gather as many owners/service manuals as I can find.  Can anyone help point me in the right direction?

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The "Yamaha" engines in boats and some US Ford V6 cars are usually a Chevy/Ford block with Yamaha heads.  Sorry, cant point you to any manuals, though.

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