This is not usually possible on most drills and will be the most difficult feature to get. Lastly, and most importantly, the chuck must go down to almost zero diameter. This way, you will have two hands for manipulating the jet if necessary, and you won't have to keep hold of the drill so it can be in a vise. Next, it would be preferrable to have a trigger lock so it will stay on by itself. Somewhere in the range 100 rpm is preferrable, but a little faster may be ok. First, it must be able to turn very slowly. The drill required must have a few special capabilities. It is important that each jet takes about the same amount of time to drill out for uniformity. It will drill out very quickly, so it is important to use a very very low speed drill, and don't linger after the bit goes through. Usually it is best to mount the drill in a vise carefully, and just hold the jets by hand and let the bit pull itself into the jet. Since the orifice is already there, the drill is just shaving a small amount of brass. The main air jet, E, for the main jet system is located in the air horn of the carb body, directly in line with the main jet gallery.ĭrilling jets is relatively easy. The pilot screw determines the air flow to the pilot system and is adjustable, thus eliminating the need for a calibrated jet. That hole leads directly to the pilot air screw. The air intake, G, for the pilot system is not actually a jet, but just a hole drilled into the carb body. With major exhaust changes, or pod air filters, #34 or #37 (.34mm or. With just a minor change to the exhaust, a stock pilot will usually work fine. This works well and is relatively easy to do. 5mm where it seats into the carb body.Īlso maybe try to Search these pilot jets.Īnother option to get larger TK pilot jets is to drill them. Other details need to be checked, but these may possibly work if the head was turned down. Keihin N424-22 pilot (also sometimes just called a type 22) has a 5.5mm head, which is bigger than the TK-22 pilot's (5.0mm). Note: The Mikuni jet numbering system is not consistent with the Keihin/Dynojet/TK numbers. The emulsifier tube is a larger outside diameter(2.45mm) than the TK22 pilot's diameter (2.3mm). Their head diameter is reduced where it would seat in the carb body. Mikuni N224.103 pilots are not a good substitue. However, it may not need to be air tight. The emulsifier tube is a smaller outside diameter (1.9mm) than the TK22 pilot's diameter (2.3mm). Mikuni VM28/486 pilots are not a good substitute. The following have been examined and found to be inadequate as substitutes: Because of this, using the same number in different types of jets may result in slight differences in mixture. While they both will screw in, and use the same numbering convention as the TK22 carbs (jet number represents the I.D of the orifice in hundredths of millimeters), the internal location of the jet orifice is slightly different, and/or the length of the orifice is different. These are small-head (99101-393) Keihin main jets or their equivalent, and Dynojet brand main jets. That is described below as well.īesides the Tk-22 main jets linked to above, there are at least two sources for main jet substitutes. Another option is drilling jets which has proven to work fine as long as they are done uniformly. Some Keihin main jets and Dynojet main jets can be used as substitutes for main jet sizes slightly larger than stock, as mentioned below. The mains they have are slightly large for most applications using the stock airbox. They also have two slightly larger sizes, which should be more than adequate for most applications. The smallest pilot size they list is 32.5, which should be fine as a stock replacement for the 32. The pilots are the ones described as 23.6mm long. JetsRus carries some sizes of replacement TK-22 jets. There is no source, as yet, for actual TK22 main jets in size 94. The KZ550 D model uses size 94 main jets and 32 pilots. The jet size numbers are the orifice diameter in hundredths of a millimeter. That is 92 for the mains, and 32 for the pilots. The only source for TK-22 jets, in the stock size for Kz550A1-A3 and Kz550C1-C4 models, are in the
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