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wheels forever > how-tos
> How to Change Carburetor Jets |
How
to Change Carburetor Jets |
| This how-to
is applicable to any Keihin 40mm CV carburetor, typically found
on 1984 to 1999 Harley Davidson Evolution motors (Softails, Dynas,
Sportsters, etc.). This schematic
diagram may also be helpful when working on your carburetor. |
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Step
1:
Make sure the fuel petcock
is in the "off" position. Locate the float drain screw
and turn it counterclockwise. You may need to use a small stubby
screwdriver as pictured. Open the float drain screw to drain all
gas from the float bowl. |
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Step
2:
Open the float drain
screw to drain all gas from the float bowl. |
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Step
3:
Remove 2 float bowl
screws on the left side of the carburetor. On a stock carburetor,
these are brass phillips head screws, which are very easy to strip.
If you replace them with my carburetor
stainless allen screw kit, they look a lot nicer, and they're
a lot easier to remove and re-install with a 3mm hex key.
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Step
4:
Remove 2 float bowl
screws on the right side of the carburetor. |
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Step
5:
Remove the float bowl
(be carefuly not to bump or damage the float), and remember to
close the float bowl drain screw. |
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Step
6:
Remove the current main jet
from the main jet holder and reinstall the new main jet. Be careful not to overtighten. |
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Step
7:
Reinstall the float
bowl. |
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Step
8:
Reinstall the float
bowl, taking care not to bump or damage the rubber float. Install
the 4 float bowls screws by snugging them evenly and then tightening
in a criss-cross pattern. Do not overtighten. |
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Step
9:
Re-open the fuel petcock
and check the float bowl gasket and float drain hose to make sure
fuel is not leaking. That's it! |
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