Originally Posted by
spaceworm
Please help a less experienced folk learn how to do the "overlap check".
Thank you very much.
Sincerely, Richard
Club Saito #635; Saito 56, 100, 120abc, 130T, 180
YS F 120;
As the crank throw goes over TDC, the exhaust valve will be closing while the intake valve is opening. At TDC, both valves will be open slightly & a near equal amount. I hesitate to say equal as there appears to be a slight difference in the open/close as far as degrees before/after TDC.