ORIGINAL: paulflys4fun
Hi, been out with the plane today, but the engine is still having the mis fire problems. The spring was missing that grounded the cap, so i put an earth strap from the engine to the outside of the metal outer sheaf of the plug lead. This have cured the interferace probblem but the motor is still mis firing. I has moved the mixture in and out and apart from the normal poor running being over rich or lean the miss continues. I have moved the timing but again the engine runs the same. It does feel sounds like the ingnition system is playing up. I dont know what else to do except by a new igniton system, but dont want to until i know for a fact that my ignition is broken.
Any other help information most welcome
I might be jumping in a bit late here, but before you go trying swapping the ignition have you tried bypassing any electronics between the ignition battery/ignition (ie kill switches etc) , try another ignition battery & power switch if possible. Make sure all connections are good. Also check plug & plug gap.
Remove any fuel probe type fillers and just use simple t or fuel dot setup.
Also clean the filter screen in the carby if you having to play with the needles & they arent affecting tuning properly. Small bit of junk in the fuel is all it takes to gunk up the screen. Pic attached
The motor will run fine without the spring in the cap, it will still ground OK, the spring is just to be sure to be sure. Hooking up an earth wire isnt fixing anything, is just masking a problem somewhere.
Get back to basics to eliminate anything not so obvious but right in front of you if you catch my drift...sometimes we cant see the forest for the trees
Cheers
Scott
DLENGINES AU