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J&P Cycles Values

J&P Cycles® Adjustable Main Jet

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Everyday Low Price: $16.99

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J&P Part: 4000265

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J&P Cycles® Adjustable Main Jet

Fitment Note: For S&S Super 'B' carb only.

• A fully adjustable main jet for S&S Super B carbs

• The assembly fits easily into the already tapped hole for the float bowl drain plug directly below the main circuit metering jet

• Provides positive and accurate adjustment for varying conditions and best performance

Product Specs

  • Carb Jets: Main Jets
  • Diameter: 110 jet
  • Sold in Units: Each


Fitment Note: For S&S Super 'B' carb only.

Note: This item is a universal/custom fit component, and does not have any direct standard/OEM model application. Some items may require modification and an advanced level of mechanical skill and/or knowledge for installation.

Customer Reviews


Very impressed. Nice to be able to set the cruise and tune it on the interstate. Nice product; beats changing main jets!


works great


Beats jetting manually, less plug fouling, better idle and some noticable performance improvement.


This product finally solve my jetting issue for my 1981 Shovelhead.