MarineEngine.com - Your online store for all types of marine engines and boat parts.
PHONE ORDERS
Monday - Friday
9:00 AM - 5:00 PM EST
Click for TOLL-FREE Number
Online Checkout
Special $9.95 Flat Rate Shipping
(800) 209-9624 | Home | Contact | Shipping | Returns | Cart View your shopping cart.
Part Number Search
Shop by engine/drive part number.
Original & matching parts for sale.
Manuals & Accessories
Shop by description, item number
or manufacturer's model number.
Boat Repair Forum Boat Repair Forum   Boat Video Gallery Video Gallery
   
Results 1 to 2 of 2
  1. #1
    michael dever's Avatar
    michael dever Guest

    Default " Was hoping a post might give

    " Was hoping a post might give me some ideas on what to check on my 1992 120hp Johnson. I have it on an 18' Starcraft and while on plane running at ~80% throttle, the motor will slowly increase rpm and boat speed. Maybe like someone has increased the throttle position or its getting more gas. When I ease the throttle back enough to lower the rpm, its always too much and goes off plane. There does not seem to be a sweet spot for running less than full throttle.
    I have replaced the fuel filter and recently tuned it up but this condition seems to be getting worse over time.

    Any advise?

    Thanks,
    mtd "

  2. #2
    Join Date
    May 2001
    Posts
    1,678

    Default "Mike, Sounds like a strang

    "Mike,

    Sounds like a strange problem.

    My only guess is that there is a problem with the fuel system, causing the engine to run very lean. This can cause the rpms to increase. Then, when you decrease the throttle, the engine rpms drop off rapidly due to lack of fuel.

    [img][/img]"

Similar Threads

  1. Force 120hp wonbt come up on plane
    By rjslape in forum Chrysler Force Outboard Archive
    Replies: 1
    Last Post: 08-05-2008, 10:05 AM
  2. UpgradesPower increases for Chrysler 105HP
    By JTSPOM in forum Chrysler Force Outboard Archive
    Replies: 0
    Last Post: 03-10-2006, 01:35 AM
  3. 1976 Johnson 70 hp wonbt get up to speed plane
    By art in forum Johnson Evinrude Outboard Archive
    Replies: 6
    Last Post: 05-21-2004, 01:17 AM
  4. 92 Mercury 115 idles rough and takes for ever to plane out with no top end speed
    By Allen Clark in forum Mercury Mariner Outboard Archive
    Replies: 1
    Last Post: 05-04-2004, 11:20 PM
  5. 1990 Evinrude 120hp cuts out at high speed
    By BillToreki in forum Johnson Evinrude Outboard Archive
    Replies: 2
    Last Post: 06-05-2003, 08:33 AM

Posting Permissions

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