Keep in mind there is alot “slop” in that carb linkage, especially on the 10hps. It is near impossible to get the cam pick up perfectly set, it will be slightly off in one direction or the other. It is better to have the cam start moving the carb linkage slightly “late” then too early. Again, if that throttle does not close completely at idle speeds, the engine will spit lean and stall. Make sure that choke linkage is not inteferring, holding the throttle plate open slightly. The best way to make sure the throttle plate is closing completely is to remove the carburetor and have a look at the throttle plate from the back side of the carb throat. Sometimes, throttle shafts get worn, linkage gets worn/bent, which might hold it open a bit.
