Go Back   Winnipesaukee Forum > Winnipesaukee Forums > Boating > Boat Repairs & Maintenance
Home Forums Gallery Blogs YouTube Channel Classifieds Links Calendar Register FAQDonate Members List Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Display Modes
Old 06-15-2018, 10:15 AM   #1
AC2717
Senior Member
 
AC2717's Avatar
 
Join Date: Apr 2007
Location: Maynard, MA & Paugus Bay
Posts: 2,120
Thanks: 577
Thanked 250 Times in 182 Posts
Default 20HP Envinrude with OMC Controls Issue/Question

Hi Guys,
i have a very healthy 87 Evinrude 20HP 2stroke with OMC controls on the back of my little putt-putt/fisher. It runs smooth so this is more of a throttle control issue.

Putting the boat in gear it goes in just fine forward and reverse as soon as the shifter clicks forward or reverse. The issue is when I go to accelerate the throttle is only responsive at like 3/4ths the way forward and the same backward, and at 3/4th the way i get a small increase in power, and then the rest of the way it appears to be wide open. At the same time there is some play in the handle back and forth until rpms kick in at the 3/4th point.

I am guessing i need a cable adjustment or maybe even a new cable. - i do believe there is almost no adjustment left on the throttle and honestly i can repair many things, but I do not want to play with the throttle, rather have someone do it, hey maybe I can pay a forum member to take a look - beer sound good??? lol just kidding, i can pay the greenbacks

I have operated it this way for about 3 years now as it hadn't really bothered me, but I wanted to start to venture out further with it and my daughter has started to operate it more.

Thoughts on this? or need a better description let me know.
__________________
Capt. of the "No Worries"
AC2717 is offline   Reply With Quote
Old 06-15-2018, 01:23 PM   #2
The Real BigGuy
Senior Member
 
Join Date: Apr 2004
Posts: 569
Thanks: 17
Thanked 161 Times in 102 Posts
Default

Sounds like a stretched throttle cable.


Sent from my iPhone using Winnipesaukee Forum mobile app
The Real BigGuy is offline   Reply With Quote
Old 06-15-2018, 03:28 PM   #3
AC2717
Senior Member
 
AC2717's Avatar
 
Join Date: Apr 2007
Location: Maynard, MA & Paugus Bay
Posts: 2,120
Thanks: 577
Thanked 250 Times in 182 Posts
Default

thank you for the insight, so need to replace then?
__________________
Capt. of the "No Worries"
AC2717 is offline   Reply With Quote
Old 06-15-2018, 05:08 PM   #4
The Real BigGuy
Senior Member
 
Join Date: Apr 2004
Posts: 569
Thanks: 17
Thanked 161 Times in 102 Posts
Default

I’d consider it. (Caveat: I am not a mechanic. I only play one on Winnipesaukee.com)


Sent from my iPhone using Winnipesaukee Forum mobile app
The Real BigGuy is offline   Reply With Quote
Old 06-15-2018, 05:16 PM   #5
8gv
Senior Member
 
8gv's Avatar
 
Join Date: Jan 2012
Posts: 1,139
Thanks: 23
Thanked 333 Times in 206 Posts
Default

How long has it behaved like this?

If the motor is new to you and you do not have a history of it’s “normal” behavior, you could be seeing something that is not an issue.

In my experience moving the throttle forward in neutral allows the motor to rev quite fast once the half throttle point is passed.

The reason is that there is no load on a two stroke motor.

If it behaved differently in the past then nevermind...
8gv is offline   Reply With Quote
Sponsored Links
Old 06-15-2018, 06:33 PM   #6
Dad sold the C * C
Senior Member
 
Join Date: Feb 2014
Posts: 262
Thanks: 101
Thanked 59 Times in 38 Posts
Default

It could be the cable, or it could be whatever the cable moves in the motor. I'll see if I can find anything in my OEM book but I think it's at the lake, I'll be up tomorrow.

Same as the other thread I recommend giving Joel a call at Runner Outboards.
http://runneroutboards.com
Dad sold the C * C is offline   Reply With Quote
Old 06-15-2018, 06:46 PM   #7
AC2717
Senior Member
 
AC2717's Avatar
 
Join Date: Apr 2007
Location: Maynard, MA & Paugus Bay
Posts: 2,120
Thanks: 577
Thanked 250 Times in 182 Posts
Default

Quote:
Originally Posted by 8gv View Post
How long has it behaved like this?

If the motor is new to you and you do not have a history of it’s “normal” behavior, you could be seeing something that is not an issue.

In my experience moving the throttle forward in neutral allows the motor to rev quite fast once the half throttle point is passed.

The reason is that there is no load on a two stroke motor.

If it behaved differently in the past then nevermind...
actually been like this for the past 2 seasons, I am noticing it getting a touch worse, and I know the throttle adjustment thumb screw on the cable is as tight as it can go.
__________________
Capt. of the "No Worries"
AC2717 is offline   Reply With Quote
Old 06-16-2018, 09:53 AM   #8
Top-Water
Senior Member
 
Join Date: Nov 2015
Location: Derry-Belmont
Posts: 701
Thanks: 435
Thanked 275 Times in 155 Posts
Default

You might be playing with fire if you do not have keen understanding of how the throttle / carburetors and ignition timing are synchronized on an older outboard 2 cycle engine.

I would not recommend playing with or adjusting anything you don't completely understand, it's not a matter of just getting the throttle to open up more because of something like a stretched cable which I doubt has happened.

A great deal of the horsepower on a outboard motor comes from proper ignition timing in relationship to throttle position vs engine rpm.

Without a transmission like a car or motorcycle, ignition timing is used to help the outboard engine make power at different throttle positions.

You might even get the engine to run "awesomely" for awhile (like it has never ran before) with just some guesswork adjustments but are actually just destroying the engine with out even knowing it.


Be careful playing with it, very special tools are needed to get it back to factory settings to insure the engine has a long lifespan.

Quote:
Originally Posted by Dad sold the C * C View Post
It could be the cable, or it could be whatever the cable moves in the motor.
Often on mercury outboards of this size/generation and age of engine it also moves the trigger mechanism under the flywheel. Admittedly I do not know how OMC does it.

Good advice as mentioned above, an OMC expert.
http://runneroutboards.com
Top-Water is offline   Reply With Quote
The Following User Says Thank You to Top-Water For This Useful Post:
AC2717 (06-18-2018)
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -4. The time now is 06:02 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.

This page was generated in 0.25965 seconds