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The rotation of the 4t scooter is slowly coming down from the rotation.

Tom2602 18735 16
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 17022131
    Tom2602
    Level 3  
    Hello.
    I have a problem with the 4t scooter.
    It goes well into revolutions, but worse with descending from revolutions.
    More precisely, when I give the gas, it will normally go into revolutions and when the gas is released, it goes down to 4-4.5 thousand and keeps it for about a minute and then goes down to 2 thousand and it walks normally ...
    The symptoms are as if something is clipping ...
    Immediately I say that the line does not jam ...
    What could it be?
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  • #2 17022173
    1133
    Level 14  
    Hello
    Usually, the problem is with the left-hand air that gets on the carburetor connection.
    check the vacuum hoses that are connected to the stub and the stub itself is not damaged.
  • #3 17023662
    Staszek49
    Level 35  
    Check the condition of the throttle cable, it may be improperly laid or worn. Raise the seat and observe that the throttle responds to the throttle trigger and at what rate it returns to its original position.
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  • #4 17028437
    Tom2602
    Level 3  
    The line works perfectly. The throttle immediately returns to the closed position and the scooter still keeps high speed ...
  • #5 17028612
    barton21
    Level 26  
    There is an ebonite washer with an O-ring between the suction socket and the head, and the O-ring is also in the socket. Replace both O-rings. As it will continue unchanged, cleaning the carburetor and adjustment
  • #6 17030329
    Tom2602
    Level 3  
    Carburetor cleaned, washer between the connector and the head also a new O-ring, the connector is all new because it was cracked a little and the symptoms are still the same.
    I would like to add that the regulation does not give anything and to have slow speed, the rotation screw must be screwed in all the way ... otherwise it goes out.
  • #7 17030927
    barton21
    Level 26  
    What color of the candle? What mileage of the scooter?
  • #8 17033007
    paweld69
    Level 28  
    Mixture adjusted? Mixture screw how many turns has been screwed out?
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  • #9 17036061
    Tom2602
    Level 3  
    The candle is the color of coffee with milk ...
    The mileage is not all 8,000 kilometers.
    The ring of the candle shows that the carburetor is rather well positioned. And the more so because it burns to the touch, whether warm or cold, there is no problem with it. It turns into normal, only there is a problem with descending to slow ...
  • #10 17036184
    barton21
    Level 26  
    Check valve clearance. It should be 0.05 on suction and 0.08 on exhalation. If 8,000 has mileage without repairs, it is very much for a 4t scooter (if it is Chinese.)
  • #11 17037201
    Tom2602
    Level 3  
    The valves were regulated as you write ... the head was put on a new one in December before Christmas and the valves were lapped because even though the head was new, the valves let go a little ... the pressure is very good.
    There is no problem with launching whether it is warm or cold ...
    And I think that such a mileage is not much because I had a zippa vapira before, he lived to 47 thousand kilometers without repair ...
  • #12 17040107
    Tom2602
    Level 3  
    Does anyone else have any ideas?
  • #13 17040302
    E8600
    Level 41  
    Only after firing it is this way?
    "Tuning" rollers / variator parts were not installed by any chance?
  • #14 17040745
    RafalGT2
    Level 24  
    Diaphragm in carburetor checked? is she okay not pruning? It happened the same after replacing the head? Was anything else replaced? What nozzle sits in the carburetor, as you know, after a certain mileage, you need to adjust the carburetor of experience, I know that sometimes in 4t Chinese, after a certain mileage, you need to change the nozzles.
  • #15 17040821
    Tom2602
    Level 3  
    The scooter comes off the revolutions, regardless of whether it is warm or cold, and it does not affect whether it is immediately after firing or if it comes a bit ...
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  • #16 17040890
    barton21
    Level 26  
    Check that the choke is working properly
  • #17 17041206
    Tom2602
    Level 3  
    The suction works because the scooter starts at higher speed and after about a minute it goes down slowly.
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Topic summary

The discussion revolves around a 4t scooter experiencing issues with its RPMs, particularly when descending from high revolutions. The user reports that the scooter maintains high RPMs when accelerating but drops to 4,000-4,500 RPMs upon releasing the throttle, eventually stabilizing at 2,000 RPMs. Various potential causes are suggested, including air leaks in the carburetor, throttle cable issues, and the condition of O-rings. The user confirms that the carburetor has been cleaned and O-rings replaced, but symptoms persist. Additional checks recommended include valve clearance, mixture adjustment, and the condition of the carburetor diaphragm. The user notes that the scooter starts well and runs normally, but struggles with RPM drop regardless of temperature or time after starting.
Summary generated by the language model.
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