Press Fit #38 Slow Jet KEYSTER PRESSFIT. Sold in packs 5. The Keyster press fit jets are designed to allow a qualified mechanic to replace the pressed in slow jet found in many 70s and 80s Honda models. CB350/400/500 Fours are just a few of the models that use the pressed in Slow Jet. These jets are not available from Honda. This can save a carburetor by allowing the slow jet to be removed for proper carb body cleaning and then be replaced with a brand new jet upon re-assembly. Part No. 27-168.38.PK5 ( )