Question about Honda Motorcycles

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The carb tuning is off on my honda moped.... please help! It cranks and will run, but as i pull back on the accelerator it loses power and begins to die. PLEASE TELL ME HOW TO TUNE THE CARB PROPERLY!

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  • adam bikedoc Apr 12, 2015

    is it a city express it looks like it by the shape of the airbox corner I can see



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  • Honda Master
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The problem will be more than likely a blocked main jet if it ticks over ok the pilot jet is fine.Take the carb off and turn it upside down take the screws out that hold the float chamber on and you will see two brass jets in the carb the bigger central one is the main jet make sure the hole in the centre is clean and make sure there is not any dirt in the bowl.also check the fuel for water as this has the same effect.basically your bike is running weak/lean.

Posted on Apr 12, 2015

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Lower brass screw ( air/fuel mixture screw) wind in fully then wind out 1 & 1/4 turns. undo ally top ( cable runs through it ) you will find a barrel on a spring holding the needle, the needle has a cir clip governing its travel into the needle seat, it should be in the middle groove ( there are 3 grooves) iff this does not cure he problem remove the carb, turn upside down remove 4 screws and check the float needle valve is operating.

Posted on Apr 12, 2015

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  • Honda Master
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The carb tuning is off on my honda moped.... pleas - 25643205-5sp5orn0xnhdqraxk0v0421v-1-0.png

Posted on Apr 13, 2015

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Posted on Jan 02, 2017

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SOURCE: i have a 50cc moped qt jinlun i just bought anew

Hi and welcome to FixYa,

To my understanding, most of these China made scooters uses a vacuum controlled cut-off fuel valve. Vacuum is tapped either from the carb out or intake coupler to activate and allow fuel flow; no vacuum no fuel from tank. Possibilities are:

  • no or little vacuum to allow fuel flow;
  • vacuum controlled cut-off fuel valve faulty.
A workaround is to install a manual cut-off or bypass it entirely.

Incidentally, the 'revs like mad' is a result of slight overflow when fuel first flows to a starved/empty carb bowl.

Good luck and thank you for using FixYa.

Posted on Apr 20, 2009

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SOURCE: motorcycle dies while riding,like gas is cut off

Check fuel pump. You might have a bad diaphragm.

Posted on Sep 06, 2009

  • 301 Answers

SOURCE: In my honda xlr 125 i changed the main jet to #92

The only way to know if the jetting is correct is to see how well it runs - and check the spark plug color.
You can start by warming up the engine and adjusting the idle mixture. Do this by turning the idle mixture adjustment screw (there are only two adjustment screws on the carburetor: one is the idle speed adjustment, the other is the idle mixture adjustment). Turn the idle mixture adjustment screw in or out until the fastest idle speed is attained. Then adjust the idle speed with the idle speed adjustment screw.
Now ride at full power and see how well it performs. If the engine cuts out or surges at full throttle, that means the main jet is too small. If the engine produces black smoke from the exhaust and doesn't seem to produce enough power, then the main jet is probably too big. Confirm the main jet correctness by looking at the color of the spark plug: white or light tan = too lean (main jet too small). Dark brown or black = too rich. Dark tan to brown color = perfect.

Posted on Nov 30, 2009

Testimonial: "The information was great. Sorry for the late feedback it was only now I found the way to give feed backs."

  • 1 Answer

SOURCE: moped wont start

my moped wont start it has gas and i have done changed the spark plug 3 times

Posted on Apr 15, 2010

SOURCE: Can't find a carb rebuild kit for my 1983 Honda VT500FT Ascot

Bike Bandit has everything you need to rebuild the carburetor on your 1983 Honda VT500FT V-Twin Ascot, click on the link below to view

Posted on Apr 18, 2010

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