stihl sr 420 57 cc backpack blower tear down and attempt to rebuild and run

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  • เผยแพร่เมื่อ 26 ธ.ค. 2024

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  • @cristiangomez7290
    @cristiangomez7290 3 ปีที่แล้ว

    Una pregunta técnico, si se cambia de pistón Y kit carburado de la Máquina Sr 4-20 aumenta la potencia?

    • @2strokefanatic578
      @2strokefanatic578  3 ปีที่แล้ว +1

      hello Cristian, i hope you understand I'm going to answer you in English because my Spanish spelling is horrible, your technical question by changing the piston and new carb kit would make the blower run better, a defiant yes, and here is why, if you put in a piston with new rings, you will have better compression provided the cylinder is in good shape no scalding or lines in the walls and the rings will give you better compression as long as they have lubrication on the ring and piston, now remember that the last part when the piston is on its upstroke where it passes the intake and exhaust does it make compression, a good compression would be about 90 to 125 or more for a good running 2 stroke, as long it has the right amount of oil gas mix, that means a 32 to 1 oil gas mix is a must and enough of that mix at full power, which means the 2 stroke needs to be a little rich in oil gas mix to run at full speed to be cooled down and not burn up, this can be adjusted by the high speed needle by adjust it at full speed till it screams then give it a tiny turn to richen 1/8 turn to give it a little extra gas so it keeps cool and not burn up
      on a typical 2 stroke carb there are 2 sides, 1 side the fuel pump, the other side meters the gas into the 2 stroke, first the pump side, usually there is a gasket and diaphragm, the diaphragm will have 2 flaps that act as one way valves that direct the gas into the pump section and out of the pump section then goes through a tiny screen to the other side which is the metering side, thus will have a gasket and a diaphragm with a little metal piece that moves a lever to open up a plug that lets the gas into that side, now that diaphragm needs to be soft and able to move, if it is hard and has limited movement, needs to be replaced
      also i need to mention that gasket between the cylinder and body where the crank is needs to be in good shape if you see oil or it is wet replace that gasket or it will be very hard if not impossible to start, this goes for all the gaskets, if in doubt about the condition of the gasket just replace it
      well there you go Cristian i hope this helps with your leaf blower, remember to subscribe, give a like and please tell your friends about me i welcome questions in English and Spanish but i need to reply in English because my grammar for Spanish is not very good and my sentence would be a train wreck of misspelled words and screwed up concepts that goes nowhere.

    • @cristiangomez7290
      @cristiangomez7290 3 ปีที่แล้ว

      @@2strokefanatic578
      Thank You