Do the numbers add up?

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   In Feb we pruchasing our first SN, 1980 with the 351W.  The carb was replaced in '05 and the tranny in '04 or '05.  The boat has 1000 hours...and the side graphics curiously say Obrien's Ski instead of the Ski Nautique graphics.  I purchased through a dealer in Lewisville, Texas so I don't know much about the original owner.  

So far, we've put 40 hours on the boat and here's what we're seeing. 

Federal 13 x 13 prop...very bad shape(dings and almost considered small chunks missing from the edges)

Top end around 43-44 (checked with GPS)

RPMs seems to be closer to 5000 than 4400.  Though, I suspect this is incorrect because when motor is off...the RPMs read 1500.  How does one fix the RPM gauge?

The throttle seems a little sticky...in that it's not super easy to make adustments in the 20-24 mph range.  

And I suspect the boat is holding tons of weight up front due to soaked foam.  

So...should we be getting closer to 50mph out of this boat?...and how do I test whether or not the RPM gauge is correct?

Thanks!...and I'll post some photos and a profile shortly..

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The Boat - 80 Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: July-08-2006 Location: United States Status: Offline Points: 44	Post Options Post Reply Quote The Boat - 80 Report Post Thanks(0) Quote Reply Topic: Do the numbers add up? Posted: July-12-2006 at 10:47am
	In Feb we pruchasing our first SN, 1980 with the 351W. The carb was replaced in '05 and the tranny in '04 or '05. The boat has 1000 hours...and the side graphics curiously say Obrien's Ski instead of the Ski Nautique graphics. I purchased through a dealer in Lewisville, Texas so I don't know much about the original owner. So far, we've put 40 hours on the boat and here's what we're seeing. Federal 13 x 13 prop...very bad shape(dings and almost considered small chunks missing from the edges) Top end around 43-44 (checked with GPS) RPMs seems to be closer to 5000 than 4400. Though, I suspect this is incorrect because when motor is off...the RPMs read 1500. How does one fix the RPM gauge? The throttle seems a little sticky...in that it's not super easy to make adustments in the 20-24 mph range. And I suspect the boat is holding tons of weight up front due to soaked foam. So...should we be getting closer to 50mph out of this boat?...and how do I test whether or not the RPM gauge is correct? Thanks!...and I'll post some photos and a profile shortly..

great78 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: October-04-2005 Location: United States Status: Offline Points: 103	Post Options Post Reply Quote great78 Report Post Thanks(0) Quote Reply Posted: July-12-2006 at 1:11pm
	I'll let the more knowledgable answer the tough questions but sounds like the top end is about right. I've seen lots of electronic tachs settle at 1000 or 1500 rpm when you turn them off. The usually drop to zero when you turn the ignition back on. Congrats on the new ride!
	Missin' this 78SN Lovin' this 96

The Dude Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Platinum Member Joined: October-19-2004 Location: Houston Status: Offline Points: 1334	Post Options Post Reply Quote The Dude Report Post Thanks(0) Quote Reply Posted: July-12-2006 at 10:01pm
	Congrats! Did you buy from Buxton? I had a great experience there. I'd drive from Houston to deal with those guys instead of these down here any day.
	Mullet Free since 93 95 Sport

stang72 Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: July-31-2004 Location: United States Status: Offline Points: 1608	Post Options Post Reply Quote stang72 Report Post Thanks(0) Quote Reply Posted: July-12-2006 at 10:27pm
	I saw that one....your speed is not bad for having a prop that is in questionable shape. Try a new prop or get that one reconditioned (for $100-$120)....you will see 2-4 mph top end.For new... Look into the Acme 540(about $300.00)...or OJ. 50 mph is what a SN for that time period can do if everything is working together as it should...strong engine timed correctly etc. 45-47mph is good! As far as soaked foam...you don't know until you probe....if it's well soaked, the boat is draggy(slow out of the hole and top end)...sounds like your running pretty good and need to improve the prop performance.
	stang Face plants are not that funny when it's you face! The Super Air

The Boat - 80 Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: July-08-2006 Location: United States Status: Offline Points: 44	Post Options Post Reply Quote The Boat - 80 Report Post Thanks(0) Quote Reply Posted: July-12-2006 at 11:06pm
	Excellent good to hear...looks like I'll see if I get that 2-4 real soon...going to have to order a new prop as the replacements from a friend may not seem to work (will on that in a few minutes). The Dude...I bought from DFW Boats in Lewisville. Nice guys...though they didn't really know the boat all that well, of course being a first time buyer I didn't really know what I was looking for...but now after tearing apart the underwater gear and the front flooring...I'm learning fast...

David F Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: June-11-2004 Location: United States Status: Offline Points: 1770	Post Options Post Reply Quote David F Report Post Thanks(0) Quote Reply Posted: July-13-2006 at 9:18am
	As far as the sticky throttle is concerned, there could be several things going on. First, disconnect the throttle cable from the carburetor and then move the lever through its travel range. Is the movement smooth or sticky. If sticky, then you may need a new control cable, or reconditioning (lubricating) the throttle control. If smooth, then pay attention to how the trottle cable is connected to the carburetor throttle arm. Was it mounted as high as possible. Is the throttle cable in a bind when at the problem setting? Just spend some time sorting out the cable and/or replacing and you should be able to solve the problem. Congratulations on you purchase.

Do the numbers add up?

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