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Recent content by rsukup

  1. R

    1978 predictor repower and prop size

    Run your numbers on the prop calculator. Here's what I get: 5800 1.85 22 .0507 62 (for the 21) 5400 1.85 25 .088 63 or (24") 5400 1.85 25 .0738 64 I'm getting ready a 14x24" 2 blade Merc HP bronze for my 87 Johnson 140 on a CVX 16 (weight 700 lbs) that I re-hubbed. Also have a 13 3/4x23 2...
  2. R

    Spectra 171 - How Fast?

    Another member posted that the HP of the XP is under rated at 150 vs the standard 150. I'm guessing the Dyno tests were recorded in reverse. I can't find the site now but there are other misinterpretations. Lower unit ratio will change the torque specs as well as rpm may be less at 6000 than...
  3. R

    Spectra 171 - How Fast?

    Spectra 171 When you get to where you can work on your engine check each cylinder for 7/16" spark with a spark tester. Also check compression with a good tester. Cold it will run about 10 lbs low. Don't know what the numbers should be with the V-6 but check other forums like...
  4. R

    Predictor Prop Help

    If your spline count is 15 and housing is 4" or larger you need to tell us your gear ratio. Turn the flywheel until the prop turns once and count the revolutions. You should have a 13 spline unless it's a commercial motor. Here are some good props for the small LU in MN...
  5. R

    Predictor 140 looper

    Is it possible to get some new replies? 140 big block or small? Mines a small(1987). Are you at 59 mph and RPM 6000?
  6. R

    Spectra 171 - How Fast?

    I put your numbers in the prop calculator using 20 for a cupped prop and got 12.5%. Sounds about right. Boat weighs 1100. My question is. Do trim tabs slow down the boat? I just raised mine because I think they drag with the motor trimmed. I'm getting too much slip with a Carlson CVX 16...
  7. R

    Predictor Prop Help

    Predicter prop help Give us your 4 blade 19p results and I'll put them in the prop calculator. Go to this page under outboard technical discussion here: http://checkmate-boats.com/forums/showthread.php?t=22802 He shows 1.5% slip with a 4 blade and 10% with a 3 blade. Don't know your ratio on...
  8. R

    Engine Monitor Alarm Sounding?

    Did you get your alarm diagnosed? Your manual will tell the sequence of beeps. I have an 87 140hp. I believe the low oil tank is a 20 sec beep. (Correct, the alarm will sound at 1/4 tank level.) I had to unhook the tank sender because it would start the beep for no reason, (tank full) Beat on...
  9. R

    Prop Selection

    prop selection I'll reply if it's not too late. I hope you didn't waste a lot of money on props because I doubt you are running 6300. While you didn't state your speed or year of motor. Your new tach is probably on the wrong pin for the alternator. Five pin for 10 pole alt or 6 pin for 12...
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