Does size matter - for the carb...
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Road Captain
Joined: Feb 2020
Posts: 732
Likes: 909
From: Concrete jungle
The install PDF has that note - That's where i saw the same. link
And just because...some pics:
Last edited by Illinois_Minion; Oct 13, 2025 at 07:02 AM. Reason: edits and updates
3rd Gear
Joined: Apr 2026
Posts: 7
Likes: 3
From: Florida
Basic carb settings should include these directions. Idle mixture screw is for IDLE only then….just above idle up to 3/4- Wide open throttle fuel mixture controlled by “slow jet size” and accelerator pump needle size (and direction)
what your looking for is a long prolonged jet of fuel, not a short fat jet of fuel. And where it is” directed”
most stock carbs direct that fuel at only the rear cylinder…..tweek it to hit at the “split” so your fuel delivery is as even to both cylinders as possible.
main jet size used for full throttle fuel setting.
Take regular plug readings after riding 10 or more miles at steady throttle settings. (To avoid false readings caused by accelerator pump)
for you “slide” carb guys….the needle height and size control midrange fuel delivery.
it sound like your slide (needle)may be too high to get such dark plugs.
plugs should be a “light” chocolate to tan color…..also look at the base of the plug (the round part at base of threads) chocolate color is what you need to look for.
it can be tough to read plugs with all of the fuel additives in todays fuel….have fun, be patient, and good luck.
what your looking for is a long prolonged jet of fuel, not a short fat jet of fuel. And where it is” directed”
most stock carbs direct that fuel at only the rear cylinder…..tweek it to hit at the “split” so your fuel delivery is as even to both cylinders as possible.
main jet size used for full throttle fuel setting.
Take regular plug readings after riding 10 or more miles at steady throttle settings. (To avoid false readings caused by accelerator pump)
for you “slide” carb guys….the needle height and size control midrange fuel delivery.
it sound like your slide (needle)may be too high to get such dark plugs.
plugs should be a “light” chocolate to tan color…..also look at the base of the plug (the round part at base of threads) chocolate color is what you need to look for.
it can be tough to read plugs with all of the fuel additives in todays fuel….have fun, be patient, and good luck.
Last edited by RJjettech; May 11, 2026 at 10:25 AM. Reason: More info
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