Welcome!!!!

Revving in neutral tells nothing about the health of your motor. That being said.....

1) Fuel-- Try a fresh tank if fuel is over a month old. Check for leaks or fuel bulb collapsing.

2) Spark--- Verify plugs are firing every stroke with a bright spark

3) Compression --- appx 100 psi and within 10% of each other.


I would guess fuel condition first. If not, check the others and post your results.


Good luck