Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hello, and thank you for choosing Just Answer. My name is***** will be happy to assist you. Many times this problem is caused by either a loose valve guide, or a sticking valve.
The lobe on your cam shaft, pushes your push rod upward, in order to pivot your rocker arm, to open your valve. If you rocker arm comes to a stop, before your valve fully opens, your push rod will bend. Your seal likely moved, when your valve guide moved.
Your rocker arm is very likely pushing against your valve guide ...