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

Hi there, I’ve marked TDC and BDC for each cylinder on the flywheel. Checking the exhaust valve there is at least 20% difference when the exhaust valve starts to open as if the cam is ground in correctly. After trying the cam in different positions I finally got mine to idle decent. It still seems to favor the rear cylinder but the front cylinder will start to fire after warming up a bit. Kinda disappointed too. Nice looking engine but finicky.