Small Engines (Lawn Mowers, etc.): B&S 3.5 HP model 92902 type 3301-01, throttle shaft, hp model


Question
Everything is loose and free.  The post that holds the air vane is clean and I put WD40 on it just to be sure. I also lubed the throttle.  It's hard to believe that the air vane exerts enough pressure on the spring to close the throttle, but it does.  It takes almost no pressure with a finger to open it up and rev the engine. -------------------------
Followup To
Question -
The engine will start but the throttle will not open when the manual speed lever (slow/fast) is pushed over. At fast position the governor air vane still exerts enough pressure on the governor spring to keep the throttle closed.

I replaced the governor spring and rebuilt the carburetor.  All parts came from B & S and fit fine.  I compared the new governor spring to the old one and it is the same.  I also confirmed that the spring (part # 261105) was correct by buying another one from another dealer.

Everything is assembled properly (things can only really go one way) and everything seems to be loose and workable.

I finally just shortened one of the governor springs I bought and that got me some throttle.  However, I can stick my finger under the air cleaner and push the throttle open by hand and the engine revs right up to where it used to run.

Any ideas?
Answer -
Is the air vane bolt shaft clean? Does the air vane move freely by hand?  Is the ignition coil, where the bottom of the air vane rests, smooth and flat?

Is the linkage from the air vane the the carb throttle shaft binding?  I've had this happen before but it took sometime to find the problem because the linkage was just barely binding.

Let me know.
Eric

Answer
Something had to be wore and binding.  Is the bottom of the air vane, the part that rest on the coil,  smooth and flat?

Is the carb throttle butterfly shaft wore and binding?  You will have to remove the throttle shaft to inspect for wear.

What is the engine code number?

Let me know.
Eric