340 no can start

No, you are trying to fire it with the intake valve open and can't build pressure...

Spark goes after the compression stroke with both valves closed so the expansion from the pressure can push the piston down... You need a "closed cylinder" for the pressure to efficiently push down on the piston...
Remember 4 stroke engines have two crank revolutions per cycle (One camshaft revolution)... So you need to spark on the proper TDC cycle to get combustion...
ok ill try that
thanks