thats the one,
plug 1, tune is too lean coil is going inwards, coil can break and drop into engine,
plug 2. engine has a good tune not too rich or lean
plug 3. engine is too rich the coil is dark due to too much fuel, will cause issues starting and running
plug 3. old glow plug so likely time...
very true
but i dont poke it into the flywheel i rest it on top and apply pressure,
i got to mod my savage XL chassis to fit the stop button from when i was running the X chassis
i thought of something the other night, remove your glow plug after 4/5 tanks and take a look at it, if it's dark...
usually with something to apply friction to it to stall out the engine, on my savage i can fit a engine stop button type thing
I've used a flat head screw driver or if it's idling low enough my finger against the flywheel at idle
you could also stop the engine by plugging the exhaust or...