A pair of Standard CVK 36 Main Jets.
- Factory Pro, Dynojet, Norman Hyde or BCE Precision and Quality Suppliers.
- Factory Precision Keihin Main Jets are designed to be direct replacements for Genuine Keihin jets.
- Designed to flow on the OEM fuel flow scale - not an arbitrary scale that locks tuners to hard to find brands.
Factory Keihin Main Jets are designed to be direct replacements for Genuine Keihin jets. Designed to flow on the OEM fuel flow scale.
Sizes Available: 105, 110, 112,115, 118, 120, 125, 128, 130, 135, 140, 145, 150 & 155.
Make your selection from the DROPBOX.
Sold in pairs: Replacement main jets.
Increasing the size of main jets will help the "Fueling" of the engine - Improved acceleration and performance. Ideal if you modify the air supply by fitting our NEX high-performance air filter, K&N air filters or our air box removal kits! and/or if you put an aftermarket exhaust.
Bonneville, Thruxton, Scrambler, America and Speedmaster (Carb versions of course !).
Originally, Hinckley Twins are fitted with 110- or 120-Size jets:
- 110 on Bonneville (790 and 865cc) and America / Speedmaster 790cc
- 120 on Scrambler and Thruxton (865cc) and America / Speedmaster 865cc
Our jets "rule of thumb guide" for 114, 118, 124 and 128 recommendation is as follows: But will require testing to determine the optimum performance.
- 114 on a 790cc with a TEC exhaust or Toga silencers.
- 118 on a 790cc with Dunstall or BC Predator silencers, or with TEC / Togas if the air box has been removed
- 124 on a 865cc with a TEC exhaust line or Toga silencers
- 128 on a 865cc with Dunstall or Predator silencers, or with TEC/Togas if the air box has been removed or modified. In principle, it is ideal to increase the size of the jets just enough to make a difference, but not too much to avoid compromising the flexibility of the engine. It is possible to fit larger jets as recommended, but it is only productive with other engine modifications.
Direct replacement of original jets.
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