Yea , I know , in the 70's I used to run Power Stroke (Bel-Ray) at 40:1 in my 76 YZ125C at around 1,000ft , as well as in my 79 YZ250 ....... it was Synthetic and it was all I ever ran , I think even Yamaha back then also recommended 20:1 ..... just stating what the Manual says as far as "stock" settings , my buddy I ride with rides 2 smokes a lot , he is always spooging , and I think he runs 32:1 as well (Honda oil) ,I keep telling him to run 40:1 but he says its too lean a mixture .....
The jetting was more of the focus of my post , if he is jetted rich , then that will exacerbate the issue .... , he needs to make sure his jetting is correct for the elevation/temp first , otherwise , he is not going to help the situation .... and none of his settings , like air screw , are going to be where they need to be if he is fighting a jetting issue , so it is just going to make dialing it in that much harder , he did not mention if the person he bought it from was at the same location/elevation , nor did he mention his elevation or jetting , so I always assume it is different , and to eliminate that from the equation .... , then he has a place to work from .... get the jetting correct , so the bike runs like its supposed to , then dial in the mixture ... ... but yea I agree he needs to go to at least 40:1 to stop the spooging
That is why I like 4 strokes now .... way less hassle , get jetting right , then adjust the fuel screw for about 2,500 ft difference in changes and no spooge to clean after every ride ......