Trimmer was running well, then starts running erratically.
On trying to restart, engine backfires/spits thru exhaust.
Changed plug cleaned carb, replaced with fresh fuel mix.
On trying to start still spitting, won't run. Any clues??
Sounds like an over fueling issue, Try resetting the carb to its standard settings, screw both tuning screws right in ant then turn anticlockwise to the following settings H 3/4 of a turn. L 1 full turn. This should set it back to standard. If this doesn't help then it could be a carb diaphram or sticking needle.
I was told flywheel key shearded,new flywheel. Gaskets from cylinder out,replaced all even then carb..heard possible coil,replaced. What are the chances the rings bad?I was told flywheel key shearded,new flywheel. Gaskets from cylinder out,replaced all even then carb..heard possible coil,replaced. What are the chances the rings bad?
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Your hedge trimmer uses an engine of a different design to the norm that claims better scavenging or clearing the cylinder of exhaust gas before the next load of air-fuel mix enters the cylinder resulting in lower emissions and increased fuel efficiency.
The 2-mix engine clears the cylinder by pumping fresh air through part of the induction system and up through the transfer ports followed by the air-fuel mixture.
Spitting through the carb is almost unheard of with a 2-stroke engine and in order for that to happen there must be still-burning gas present in the combustion chamber when the transfer ports open and at a higher pressure than in the crankcase.
I guess it is possible a massive compression leak past broken piston rings might cause this but otherwise it could only happen if the port timing was off or the exhaust is causing too much back pressure.
The only way for the port timing to be off is for the piston and cylinder to be mismatched.
This is a true tale sign of a valve being out of adjustment or possible burnt or sticking. Most likely its just out of adjustment. Setting them to Book Specifications of: Valve Clearance (cold) IN and EX .005" (0.13 mm) should take care of the problem. Since you said that it runs fine rules out the possibility of a sheared flywheel key, though I have seen one run with it slightly sheared. Thanks; George
YOU MAY HAVE TO USE A PULLER FOR THE FLYWHEEL I CAN'T SEE ANYTHING ON THE BREAKDOWN OF THE ENGINE THAT WOULD SHOW ANY THREADED HOLES FOR BOLTS TO REMOVE THE FLYWHEEL
If this is a 2 cycle engine the problem could be that the exhaust is clogged. Most 2 cycle engines have a spark arrestor on the muffler which clogs. could also be the exhaust port from the engine. remove the muffler and check it out.
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