Guests - If You want access to member only forums on FM. You will gain access only when you Sign-in or Sign-Up on Fishing Minnesota.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
Followers 0
channelfats

Adjusting idle down

7 posts in this topic

I recently purchased a used boat with a 97 yamaha 30 tiller on the back. Motor runs great, except she idles a tad bit high for my liking. 1.5 in gear, and .6 in reverse... its kind of the annoying in-between, either use a trolling motor, or get the cranks out. How easy is it to adjust myself, or should I say, how much trouble can I get myself into? I am somewhat aware of how to adjust it, but how much before I mess up the oil injection ratio? Or if I even will... ? Am I better off taking it in?

Thanks

Share this post


Link to post
Share on other sites

Or, is this idle speed normal, and I am expecting too much from a 3 cylander. I am used to 15hp motors.

thanks

Share this post


Link to post
Share on other sites

Dunno if the idle speed is normal.

The engine mfg specs that by RPM. However, the speed depends on RPM, prop pitch, and boat size/weight.

Not sure about Yamahas, but Mercury idle speed on my 90HP is adjusted with the ignition timing. Tweaking that does not alter the relationship of the oil/fuel ratio.

Share this post


Link to post
Share on other sites

I have a 90hp merc 2 stroke. It idles my 17' at 2.8. Is this high and coulp I make it go slower. It has the original aluminum prop on it.

Share this post


Link to post
Share on other sites

I have a 90 merc on a 17 also. The boat speed at idle is 2.4 in forward. Thats at 500 rpm. I have a 21 pitch prop on. Those two; pitch and rpm are what matters. Setting an idle screw down will not affect oil mixture.

Share this post


Link to post
Share on other sites

I have a 50hp Honda and when I bought it new the idle was to fast. It has 3 carbs , there is a idle back off srew that the linkage rest or stops on, I backed that off to slow the idle. You can alway try that and set it back if its to slow. The carbs themself come set from the factory,the srews heads are removed or broke of so they can't be fooled with, but after a couple years and the motor getting broke in I reset the carbs a little richer because it was starting to die while trolling. A small punch and light tap in the end of the srew lets you adjust.

Share this post


Link to post
Share on other sites

Quote:

there is a idle back off srew that the linkage rest or stops on, I backed that off


This is right on.. if you look at the rod that connects the carbs together there's probably a screw threaded into a flange on the carb. Back the screw off a little bit to slow the idle down.

As others have said, idle speed is set by rpm... for a 2 stroke 550 - 600 in gear is typical.

marine_man

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  
Followers 0



  • Posts

    • Wheres_Walter
      Headed up this weekend and next weekend.  WIll be fishing mostly Frazer.  Sounds like the hatch is on.  If anyone has been fishing walleye on frazer in the past few days, got any tips on depth?  Presentation?     Sounds like crawlers are the ticket right now.   Thanks
    • blue_healer_guy
      Boy, some people must just hate their life.
    • Hoey
      I recommend considering other lakes.  URL by the 4th is nearly void of walleye.  8 years or so ago, we did a two-family trip and only caught fresh water drum.  Star Trib Article
    • eyeguy 54
      http://www.startribune.com/monster-muskie-found-on-mille-lacs-exceeds-state-record/431203243/
    • 2thepointsetters
      I was honored to be part of the "Veterans on Lake Superior" trip again this year. Channel six did a nice story about the Veterans. They were a great group out on the water.   http://www.kbjr6.com/video?clipId=13445592&autostart=true
    • 2thepointsetters
          Barry is retired. I bought his boat and fished her unitl I got the 38'er. Team Crush is still using the old Whitewater.   Barry does work on my boat occasionally as the first mate.    
    • portageguy
      Motor use day or camping.  Pick up day before or day of, May1-September 30. Fill out permit at entrance and put in box when exiting or mail in.  October 1-April 30
    • BulldogInTC
      Hi Cliff -   Thanks for the update on the hatch.  Is this usually a bust for 2 weeks once the big hatches start?  Will be up the 30th-9th, but still excited since its the first time staying for a full week at the in-laws cabin.  Hoping to provide a few updates on the West Side through the week.
    • jiggin9
      Thanks for the info.  I searched before and after this thread for any old threads on this topic.  I got nothing before and this thread is the only one that pops up after.  I will keep looking online or stop at one of the big box stores.    Tight lines. 
    • CaptJohnWis
      J-Roy,  I use UL rod and 4 lb a lot when throwing jigs. I have found that the lighter the jig head, the more fish bite and the more you hook. Wind will mess up using light jigs though. When fishing heavy jigs, cranks, top water or spoons, I use heavier line and rod. If fishing weeds need heavy line as well.   Hook ups/bites is much higher with lite jigs. I missed about 50% of hits yesterday using 1/2 oz head. Landed about 90% of hits a few days ago when using 1/8 oz head. Tough to fish 1/8 oz on even 8 lb line so I stick with 4 lb .