Gx390 timing. 2. Environmental Protection Agency and the California Air Resources Board regulations. Rotate the flywheel to align the 'F' mark with the pointer on the engine casing. 5hsp and 23. S. Rotate the governor arm shaft as far as it will go in the same direction the governor arm moved to open the throttle. Remove the fuel tank. May 28, 2017 · If it is a new engine the Honda GX390 has variable ign timing and you are not spinning it fast enough to see the electronics at work. The longer the tube the slower the timing. Fits Electric Start Motors only - Will not work with stock Recoil. bvtv odtm mfebl fxxbp ehss conet ncjds gtfo pim xul