Originally Posted by
vease
I have an issue trying to start and keep running my 3W 80 with rcexl ignition unit.
If i manage to get it running it runs fine at top end and will tick over for a short while but then die.
Upon investigation I've found that it sparks on some revolutions but not others.
I've tried different ign units and different plugs and no difference. Also the pick up is brand new
Any thoughts welcome
With the plug out (no compression) it should be possible to spin the engine with an electric starter or a cordless drill. Check if it misses sparks under that condition, because as Truckracer says, leisurely flipping by hand, you will or won't get a spark depending on how quick the flip is. If you flip by hand as if you are starting (vigorously), you should get a spark every single time.