MOPED ARMY

you can get a little tiny boost by running a thicker oil. SAE30 or SAE50 ND will let your clutch slip a little more than ATF.

of course make sure all your tuning is on point, those square bing carbs can suck on the low end if they aren't tuned perfecto.

there is some clutch tuning stuff posted on here, search for posts, they can be improved slightly but there are no easy fixes when it comes to sachs.