213 – Instructions On Tuning The 249 Model To Perform Smoothly At Low Speeds

INSTRUCTIONS ON TUNING THE 249 MODEL TO PERFORM SMOOTHLY AT LOW SPEEDS

1. Adjust carburetor according to instructions given in Service Shot No. 209.
   Test carburetor manifold for air leaks by squirting gas on connection. Engine speed will increase if air leaks are present. If test shows air leak at carburetor to manifold connection, loosen carburetor pinch screw and force carburetor tightly against manifold and retighten pinch screw. It will be necessary to readjust carburetor when air leaks have been sealed.
2. Check spark plug. It has been found that the gap should be increased from the .025″ recommended to .030″-.035″ to obtain smooth performance on slow speeds.
3. Check magneto ignition point gap. It has been found that the Model 249 engines perform smoother when the magneto ignition points are adjusted to .015″.
4. Check the clearance between the rocker arm and the valve stem. It has been found that to obtain smooth performance at low speeds, it is advisable to increase the clearance from the recommended .0015″ (1-1/2 thousandths), to .0025″-.003″ (2-1/2 to 3 thousandths).
   It may be necessary to readjust the carburetor after the spark plugs, magneto points and valve tappets have been readjusted.

Walter Brown
Service Manager