Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I too found the intake valve leaking. I saw his vid about lapping the valve but I used a different method. I removed the keeper and spring from the valve stem and clamped it into the chuck of a small hand drill. I could move it off its seat occasionally as it rotated to redistribute the lapping compound. I tried Brasso but found 800 grit lapping paste worked better.