'93 25 HP Merc 2-Cyl, Electric Start

[prginocx]

It has tiller control handle. <br />Looking to buy this boat / engine combo. What is the expected compression if the engine is barely used ? <br /><br />Also I have looked through the manual and I don't see what the alternator is rated for....Does it even charge the battery when running ? It also has rope start.<br /><br />Are there any modifications I could make to increase the horsepower ? Is this power head made by Mercury or ?

 

[andy6374]

Re: '93 25 HP Merc 2-Cyl, Electric Start

Look for even compression between each cylinder, not a particular number.<br /><br />I think merc manufactures all its blocks except it's 4stroke line which yamaha makes.<br /><br />As for performance, make sure the engine is at the proper height and that it is propped correctly.

 

[prginocx]

Re: '93 25 HP Merc 2-Cyl, Electric Start

I do appreciate the information.<br />Please tell me if I'm even in the right range. I figure a really good condition used motor ought to be around 90 to 140 psi....<br />Right ?<br /><br />And how about if top / bottom cylinder are within 10 to 15psi of each other ? Am I on the right track ?<br /><br />Anyone have an idea on the alternator rating for this guy ?

 

[andy6374]

Re: '93 25 HP Merc 2-Cyl, Electric Start

What you're really looking for is no more than 10% difference in comp. between cylinders. <br /><br />Remember, different gauges will probably give you different reading and hence the actual number is less important.<br /><br />Don't know the alternator rating, probably in the 4-9 amp range.