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Poll

Any solutions on why the motor is running at 6200 RPMs @ 54 mph on GPS?

Stock 460
100%
3 (100%)
750 Holley Carb

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Total Members Voted: 3


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BOOST

  • Karma: +25/-0
6200rpm @ 54mph 1977 Hawaiian BBF 460 berkley jet
« on: December 02, 2007, 07:53:46 PM »
The boat was purchased last week after sitting for five years. I went through the fuel system, changed the oil, rebuilt the carb, greased, re-oiled the jet. The impellar and wear ring look great. Any suggestions on other trouble shooting options?Great deal 1000.00 not running it was the next weekend.
« Last Edit: December 03, 2007, 07:05:13 PM by boost »
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flytime

  • Karma: +21/-0
Re: 1977 Hawaiian BBF Berkley Jet
« Reply #1 on: December 02, 2007, 08:06:50 PM »
Boost,

Congrats on the purchase. I would also check all the cables. Throttle, place divereter if equipped, steering cable, cable that controls the bucket on the jet. Just my .02. How about posting up some pics? ;)

Bob
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Quote from: Ralph Brunt on February 01, 2009, 09:47:22 AM
the jet boat never did this to you bob ::)
Quote from: alamojimmy on May 19, 2010, 04:19:49 PM
Can I get next in line behind The Beav

AA/Paul

  • Karma: +0/-0
Re: 6200rpm @ 54mph 1977 Hawaiian BBF 460 berkley jet
« Reply #2 on: December 03, 2007, 07:19:11 AM »
Congrats!!
Welcome to the board.
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Redneck Punk
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Ralph Brunt

  • Karma: +51/-0
Re: 6200rpm @ 54mph 1977 Hawaiian BBF 460 berkley jet
« Reply #3 on: December 03, 2007, 07:34:48 AM »
i would be checking the tach, that rpm seems a bit high for the mph, what kind of pump
and welcome to scjb
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CHEAP, FAST, RELIABLE...PICK 2 CANT HAVE ALL 3
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jet boat performance

  • Karma: +25/-0
Re: 6200rpm @ 54mph 1977 Hawaiian BBF 460 berkley jet
« Reply #4 on: December 03, 2007, 07:45:19 AM »
Quote from: Ralph Brunt on December 03, 2007, 07:34:48 AM
i would be checking the tach, that rpm seems a bit high for the mph, what kind of pump
and welcome to scjb

Welcome! This is a great place with lots of good folks Tom

Re Rpms ,Ralphs correct ,something doesn't "click" a moderate Hp motor (Olds ,Chevy, Ford) should turn an A Impeller 4400 to maybe 5100 (alot of different variables) Tom
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2savage4you

  • Karma: +14/-1
Re: 6200rpm @ 54mph 1977 Hawaiian BBF 460 berkley jet
« Reply #5 on: December 03, 2007, 10:20:29 AM »
Quote from: jet boat performance on December 03, 2007, 07:45:19 AM


Re Rpms ,Ralphs correct ,something doesn't "click" a moderate Hp motor (Olds ,Chevy, Ford) should turn an A Impeller 4400 to maybe 5100 (alot of different variables) Tom

Thats good info, i didnt know that ;)


2sav
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Legal Chemistry

  • Karma: +2/-0
Re: 6200rpm @ 54mph 1977 Hawaiian BBF 460 berkley jet
« Reply #6 on: December 03, 2007, 01:55:33 PM »
RPMs seem very high.  I have an "size large" jetboat and at 4800 I'm at 50+.

Hmmm, if your tach is set for a 6 cylinder, would that be 4650rpm for a v8?  That would seem about right then.

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BOOST

  • Karma: +25/-0
Re: 1977 Hawaiian BBF Berkley Jet
« Reply #7 on: December 03, 2007, 06:56:39 PM »
Quote from: flytime on December 02, 2007, 08:06:50 PM
Boost,

Congrats on the purchase. I would also check all the cables. Throttle, place divereter if equipped, steering cable, cable that controls the bucket on the jet. Just my .02. How about posting up some pics? ;)

Bob
[/

 thanks Bob I check the cables they seem to be fine,i'm looking into the tech
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BOOST

  • Karma: +25/-0
Re: 6200rpm @ 54mph 1977 Hawaiian BBF 460 berkley jet
« Reply #8 on: December 03, 2007, 07:07:37 PM »
Quote from: Ralph Brunt on December 03, 2007, 07:34:48 AM
i would be checking the tach, that rpm seems a bit high for the mph, what kind of pump
and welcome to scjb
[/
quote]Its got a berkly split bowl it was built by GS MARINE
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FORKEDUP

  • Karma: +4/-0
Re: 6200rpm @ 54mph 1977 Hawaiian BBF 460 berkley jet
« Reply #9 on: December 04, 2007, 07:30:27 AM »
congrats on the boat and welcome to the site :)
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BEAUTY IS ONLY A LIGHT SWITCH AWAY
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21 Commander, blown 454, berk pump.

speedymopars

  • Karma: +6/-0
Re: 6200rpm @ 54mph 1977 Hawaiian BBF 460 berkley jet
« Reply #10 on: December 04, 2007, 09:56:29 PM »
Did you see what impeller is on it? If it is something small (c or d) then maybe it makes sense. If it is an A or AA, you probably aren't turning that RPM so check the tach. You would have to be making over 800 HP to turn an A that high, and you would be going a whole lot faster than 54 MPH.

My A is 43 MPH at 4300 RPM for reference.
My vote is the tach is on the wrong setting and Legal C's correct....

 
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21' 74 cheyenne 543 Mopar Berkeley Jet Place diverter

Marcsrollin

  • Karma: +33/-0
Re: 6200rpm @ 54mph 1977 Hawaiian BBF 460 berkley jet
« Reply #11 on: December 04, 2007, 10:02:18 PM »
Quote from: speedymopars on December 04, 2007, 09:56:29 PM
Did you see what impeller is on it? If it is something small (c or d) then maybe it makes sense. If it is an A or AA, you probably aren't turning that RPM so check the tach. You would have to be making over 800 HP to turn an A that high, and you would be going a whole lot faster than 54 MPH.

My A is 43 MPH at 4300 RPM for reference.
My vote is the tach is on the wrong setting and Legal C's correct....

 

Or the pump really needs to be rebuilt!
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BOOST

  • Karma: +25/-0
Re: 6200rpm @ 54mph 1977 Hawaiian BBF 460 berkley jet
« Reply #12 on: December 16, 2007, 03:59:40 PM »
Quote from: Marcsrollin on December 04, 2007, 10:02:18 PM
Or the pump really needs to be rebuilt!
My dad pick this boat up last month going to pick up new gauges this week i believe the tach is bad , and the rest of the gauges dont work,i'll keep you guys posted.
THANKS.
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