How to adjust rich/lean mixture

[lucabrazi]

I have a 1974 Evinrude Triumph 70hp Model 70473M

Engine was brought up from sea level to 5500 ft in Colorado.

Seems to be running rich, how can I lean it out? I read Tashasdaddy's Top Secret post- but I wasn't clear on where/what to turn. (wasn't clear to a rookie like me anyway )


Thanks

 

[wilde1j]

Re: How to adjust rich/lean mixture

Your motor probably has fixed jets. If so, carbs need to be re-jetted with smaller jets suitable for where you will use the motor.

 

[Daviet]

Re: How to adjust rich/lean mixture

Your engine has fixed jets, no adjustments. See #27, might check with a local dealer and see if they could recomend a different orifice.http://www.ishopmarine.com/ishop/jsp/AsplIsmCcatViewBase.jsp?&lvlCode=5&pCode=C0075709&path=BRP~A0000003~M0004784~M0004793~M0004797~C0075709&isFromCMS=false&hideAdd2CartButton=&isStandAlone=&is4CmsShop=&reqln=Unknown&reqem=Unknown&reqph=Unknown&reqFor=29&req4Browse=1&docId=&docName=&isForSupStore=false&cCatFilter=&eCatSupFldr=

 

[bktheking]

Re: How to adjust rich/lean mixture

According to the carb elevation orifice chart your motor at sea level calls for a 61D, 3000-6000ft calls for 58D.