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I have a HS45 hedge trimmer that back fires through the carb. I replaced the flywheel,coil,all the gaskets from the cylinder out and even replaced the carb. I can't figure out why?
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.
on Aug 30, 2020
Predator 8750 sounds like it is choking out of fuel. Runs for a while then starts choking and dies. Air filter has been cleaned.
If it produces black smoke when sputtering, then too much fuel and likely a carburetor float inlet needle issue.
Does it start back up or does it die and have to cool off for an hour or so? If it it has too cool down then it could be the ignition module. Check for spark.
It has an OHV engine that requires periodic valve adjustment every 100hqrs or so. Check engine maintenance schedule.
Another component to check is the anti afterfire solenoid. If bbn it's not working properly it will cut off fuel.
If you're running with a mix of stale fuel you need to completely drain all the fuel, including the carburetor bowl and refill with fresh fuel.
on Aug 23, 2020
Scotts riding mower 2046h mower
engine rpm would be the only other thing. or you have the belt routed incorrectly. are the blades upside down? I see that on an almost daily basis with customer units.
on Aug 19, 2020
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