HeadSmess
Well-Known Member
- Local time
- 2:50 AM
- Joined
- May 17, 2010
- Messages
- 3,048
check the plug threads! yes, in the head! carbon isnt particularly conductive.
check that the head is "continuous" with the rest of the engine! its only contact with the rest of the engine electrically is through the cylinder STUDS. the cylinder has a fibre base gasket correct? thats not conductive!
im sure we tried new plugs ?
that can cause complete loss of spark... but replacing EVERYTHING should have resulted in SOMETHING that worked.... unless, as i said...heads not earthing. where are you holding the plug to check for spark?
multimeter will soon tell you if its the magneto not working, narrowing the field down somewhat.
can play a part in intermittents...but...id be far more suspicious of seals etc when its erratic...what may feel like spark, simply isnt...unless you have a data logger saying that it definitely is the spark missing at times... seals or crankcase gasket are my suspicions. or a dirty carb.
cus yes, im getting the same splutters on one particular engine...and so far ive been too lazy to dig into it. i got others that are running fine, so why bother
check that the head is "continuous" with the rest of the engine! its only contact with the rest of the engine electrically is through the cylinder STUDS. the cylinder has a fibre base gasket correct? thats not conductive!
im sure we tried new plugs ?
that can cause complete loss of spark... but replacing EVERYTHING should have resulted in SOMETHING that worked.... unless, as i said...heads not earthing. where are you holding the plug to check for spark?
multimeter will soon tell you if its the magneto not working, narrowing the field down somewhat.
can play a part in intermittents...but...id be far more suspicious of seals etc when its erratic...what may feel like spark, simply isnt...unless you have a data logger saying that it definitely is the spark missing at times... seals or crankcase gasket are my suspicions. or a dirty carb.
cus yes, im getting the same splutters on one particular engine...and so far ive been too lazy to dig into it. i got others that are running fine, so why bother