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it is a armature problem common to makita products
replacing one armature with a new one does not solve the problem as the fault is a design fault
probably armature not wired heavy enough for continuous running
consider replacing it with a better brand that enables continuous operation
The armature is bad, you need to replace the whole motor. IF the armature has worn down where the brushes contact it, then it is continuously shorting out when it runs.
sparked and smoked and you are not a qualified repair person and the owners manual will make no reference to how to fix
you have 2 options
repair shop
or
junk it
Some debris, even sand or dirt, probably got into the motor, causing damage to the armature. If this is the case, you will need to replace the motor. The burning smell from the motor is generally a sure sign of a bad motor.
I usually use a match book cover between it and the magnet. this way the gap is about right and it will not hang on the magnets. put through both sides at once, then push it in and tighten it up. then take out guage. spark plug gap is .025, the armature gap on most small engines is .010,
It's probably doing that on low speed too, you just aren't noticing. What you'll have to do is get to the motor. Look at the armature and see if it's scared, missing an pieces, scratched up.. if so, then your motor is shot, throw it away.. If not, if the armature is clean, as in no physical damage, then all that is needed is to replace the carbon brushes and everything should be ok
The 6865 has a high rpm AMTEK Lamb motor, Brushes will seldom solve the problem at this stage. Once the sparking and burning starts the conectiion between the brush and commutator is arcing and burning. If the sparks are blue, save your time. A good service tech will run in brushes with a seating stone and a low voltage setup to allow new brushes to seat, but this is generally best accomplished on heavy duty , lower rpm motors. IF YOUR ARMATURE IS SCRATCHY LOOKING OR WORN LIKE AN APPLE CORE,OR THE SEGMENTS ARE NOT PARALLEL IN THE SPACING YOU WILL NEED A NEW MOTOR.
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