Register

If this is your first visit, please click the Sign Up now button to begin the process of creating your account so you can begin posting on our forums! The Sign Up process will only take up about a minute of two of your time.

Follow us on Facebook Follow us on Twitter
Page 1 of 2 12 LastLast
Results 1 to 10 of 12
  1. #1
    Registered Enforcer2's Avatar
    My Boats:
    37 Midnight Express INC. Closed Deck QUAD 250 Mercs
    Join Date
    Nov 2004
    Location
    Ocean Pines, Maryland. Wish I was at MANGOS in MIAMI!
    Posts
    831

    Mercury 300 promax

    Looking for info on the Mercury 300 pro max. Considering swaping my wife --I mean my triple 225 optimxes on my Midnigh tExpress for triple 300 promaxes.

    A lot of bay use, occassional offshore use, want to go faster

  2. #2
    Gold Member Gold Member Zero Patience's Avatar
    My Boats:
    Cigarette Top Gun, Dry Sump Sixes, Chief Blower Motors. Skater 28 with 300 XS Mercs
    Join Date
    Feb 2001
    Location
    Crystal River Fl,USA
    Posts
    769

    Re: Mercury 300 promax

    300x is not available anymore. 300 XS Stroker Optimax is available now.
    Kirk

  3. #3
    Registered Enforcer2's Avatar
    My Boats:
    37 Midnight Express INC. Closed Deck QUAD 250 Mercs
    Join Date
    Nov 2004
    Location
    Ocean Pines, Maryland. Wish I was at MANGOS in MIAMI!
    Posts
    831

    Re: Mercury 300 promax

    I was refering to the older models. Seems like there are a lot on the market now due to the new 300 opti's. Looks like a good opportunity to purchase some running 2000-2003 models.

    Any info positive or negative on the 300 promaxes??

  4. #4
    Registered CustomRigger101's Avatar
    Join Date
    Oct 2002
    Location
    Lighthouse Point Fl
    Posts
    791

    Re: Mercury 300 promax

    ran a 32 skater that had trip 300.. middle motor always get kick up alittle more on that step up but where good strong motors

    IMHO if i was going to rerig a outboard boat i'd look into the DF250's.. good motor.. can be picked up for somewhere the 9k range.. fresh out of the box.. 3 year warrenty

  5. #5
    VIP Member VIP Member dirtlawyer's Avatar
    My Boats:
    27 Concept & 18 Nordic O/B
    Join Date
    Dec 2000
    Location
    Tampa, Florida
    Posts
    407

    Re: Mercury 300 promax

    Enforcer - I was looking into the same thing recently - was told from a couple of sources to stay away from the 300 Promaxes - they were only out for a few years and were then replaced by the 300X. Apparently Merc had some powerhead failures with the 300 Promaxes.

    If any one has heard differently or has a different experience, please advise.

  6. #6
    Registered Enforcer2's Avatar
    My Boats:
    37 Midnight Express INC. Closed Deck QUAD 250 Mercs
    Join Date
    Nov 2004
    Location
    Ocean Pines, Maryland. Wish I was at MANGOS in MIAMI!
    Posts
    831

    Re: Mercury 300 promax

    Thanks I'll keep checking around for more info. I'm glad you mentioned 300X and Promax I didn't realize there was a difference. I checked with two local mechanics and neither have had any experience with them. I have found some forums that advised they drink the fuel and oil like crazy and parts are hard to find. Everything has to be special ordered.Would be nice to be able to afford bolting on three the new 300 Merc Optimax Strokers.

  7. #7
    Registered
    My Boats:
    1985 22' Velocity, 2003 38 Powerplay
    Join Date
    Apr 2001
    Location
    East Coast
    Posts
    2,670

    Re: Mercury 300 promax

    We have 300 promaxes....have been great so far. Around 300 horse each

    My friend has the 300x's...loves them. About 30 horse more and better fuel economy. Both are nice two strokes

  8. #8
    Registered Enforcer2's Avatar
    My Boats:
    37 Midnight Express INC. Closed Deck QUAD 250 Mercs
    Join Date
    Nov 2004
    Location
    Ocean Pines, Maryland. Wish I was at MANGOS in MIAMI!
    Posts
    831

    Re: Mercury 300 promax

    I have been hearing definetly go with 300x's, apparently powerhead problems with 300 pro maxes.

    Thanks for reply

  9. #9
    Registered Enforcer2's Avatar
    My Boats:
    37 Midnight Express INC. Closed Deck QUAD 250 Mercs
    Join Date
    Nov 2004
    Location
    Ocean Pines, Maryland. Wish I was at MANGOS in MIAMI!
    Posts
    831

    Re: Mercury 300 promax

    I stand coreected talked to Diamond Marine. They advised that the 300 pro maxes are great engines and in contrast he has seen more 300x powerhead problems.

    They advised that this is not due to the 300 promax being better than the 300x it is mostly due to the 300x having heavier cranks and the motors are beig turned up more than they should be resulting in failure.

    He suggested the 300x over the 300 pro max mostly due to the newer model years of the 300x.

    Hope it helps everyone.

    It' shot as out here.

  10. #10
    Registered
    My Boats:
    1992 Eliminator Daytona 27, 1999 Liberator '21
    Join Date
    Mar 2006
    Location
    Austin, Texas
    Posts
    3

    Re: Mercury 300 promax

    Another diff, X's have electronic oil injection and the older Promax's have a plastic gear in the oil pump that can fail if the motor is cranked up above the factory limiter (6500). Many people that turn the Promax's harder install an oil pump block off kit and mix their own fuel/oil.

    I am running a '98 Promax that just had it's 3rd powerhead installed when I bought the boat. Appearantly they resolved the issue by replacing a bad wiring harness or something like that.

    There was also an issue with the early coils, so I replaced them.
    I have had no trouble with it, fill it up with fuel and oil and run wide open (6k) all day long.

    ScreamAndFly has tons of info on any outboards (can I say that here?)

    Enjoy,
    Joe


Page 1 of 2 12 LastLast

Similar Threads

  1. mercury cleaver 3 blades15 1/2 x 35 for 300 promax
    By lowblue320 in forum Prop Talk
    Replies: 2
    Last Post: 04-12-2007, 04:27 PM
  2. Question on Mercury 300 promax
    By greenrt in forum General Boating Discussion
    Replies: 3
    Last Post: 05-23-2005, 06:05 AM
  3. Gas for promax 300
    By Wettin My Shorts in forum General Q & A
    Replies: 9
    Last Post: 03-06-2005, 11:27 AM
  4. Promax 300X vs Promax 300
    By Toffen in forum General Q & A
    Replies: 1
    Last Post: 06-20-2002, 10:50 PM
  5. Promax 300 or Promax 2.5's for a Skater 28
    By Toffen in forum General Q & A
    Replies: 1
    Last Post: 01-14-2002, 11:37 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
OSO Sponsor
OSO Advertisers


OSO Directory
All times are GMT -5. The time now is 11:39 AM.
Powered by vBulletin® Version 4.2.0
Copyright © 2014 vBulletin Solutions, Inc. All rights reserved.
Search Engine Optimization by vBSEO 3.6.1
Original Poster In Postbit provided by Original Poster In Postbit v1.0.0 (Free) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
Copyright 2011 OffShoreOnly. All rights reserved.