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Guff - Last things first: Forget about using a lead additive! Your tractor doesn’t need it. Besides - any “lead additive” you can buy today does not contain lead anyway. ---- Now to your carb adjustment questions: When looking at the carb from the left side of the tractor there is a small screw w/spring at the top that goes in towards a tube coming from the governor. This is the carb throttle stop (slow idle speed adjustment). Turn it in to increase or out to decrease the slow idle speed ---- There is a yellow painted screw w/spring at the nine oclock position that screws in from left to right(air / fuel mix?). This is the idle mixture adjustment. With the engine warmed up and idling, turn it in/out as required for the best (smoothest and fastest idle). After setting the idle mixture you may need to return to the throttle stop screw and bring the idle RPM back down where you want. ---- There is another yellow painted screw w/lock nut, at about a 45 degree angle on the bottom of the float bowl (fuel level adjustment?). This one is the high speed or “power” mixture adjustment. With the engine warmed and at slow idle, quickly pull the throttle wide open. If the engine stumbles at all turn the screw ¼ turn CCW at a time and try again. Repeat until the engine picks up without stumbling. However the exhaust shows any black at full RPM turn the screw CW slowly until the exhaust just clears up. ---- There is one more small screw at the very top on the right hand side that is srewed in and bottomed out, not sure what it is for? That one’s actually a plug at the end of an internal carb passage. Remove it only if you have the carb apart for cleaning – otherwise leave it alone. --- Hope this helps...
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