I had to replace the camshaft on my B&S 33r877 19hp and after replacing it and starting the engine it wants to run at full throttle all the time. I have adjusted the governor and the only way the motor will run like its supposed to is with the control plate off the motor. The governor works fine when the control plate is removed from the engine but it races when the control plate is installed. I have replaced the spring, governor rod, throttle rod and spring and I have adjusted the throttle control cable according the the B&S manual. Any and all thoughts would be greatly appreciated.