Question about Honda CB 600 Hornet F Motorcycles

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I have a Honda 1981 650 custom, The idle seems very slow and it tends to shut off when sitting at lights. How do I adjust the idle up on this?

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There is an idle adjustment screw that hangs down underneath the carburetor rack between the second and third carburetors. It usually has a black plastic knob about 1/2 inch across on it. Turning the knob will raise or lower the idle speed on all four carburetors at once.

Posted on Jul 22, 2010

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8. Idle adjusting screw set too low.
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Hi, Anonymous and the usual suspects are:
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4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
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Hi, Joelacruz and the usual suspects are:
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3. Air fuel mixture adjustment too lean.
4. Pilot/slow fuel jet clogged.
5. Faulty accelerator pump.
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7. Float bowl contaminated old fuel, water, dirt, rust, etc.
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9. Fuel line to carburetor kinked or pinched.
10. Fuel filter clogged.
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12. The gas cap is not venting properly or fuel tank venting system blocked.
13. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
14. Needle and seat stuck closed in the float bowl.
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Hi, Bill and the usual suspects are:
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4. Vacuum line from the petcock to intake manifold cracked.
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6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
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9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
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In my honda xlr 125 i changed the main jet to #92 and slow jet to #35 is this ok? If so how can i tune the carb. I am from Sri Lanka. Its a tropical country.


The only way to know if the jetting is correct is to see how well it runs - and check the spark plug color.
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First off, check and adjust the valve tappet clearances. Under normal use, the valve tappet clearance tends to decrease. With this comes lost compression and a poor idle.

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