Answer
Feb 08, 2022 - 04:58 PM
Hello Richard,
Yes this Stage 1&2 Jet Kit SKU: 4175 will come with Main Jets, however most of our jet kits do not come with pilot jets.
You can find the entire parts list in the installation guide, with this link: https://www.dynojet.com/jet-kit-for-y...
Once on the page scroll down and click on DOWNLOADS and you can upload the install guide.
Dynojet kits are designed to use the stock factory supplied pilot jet size for a number of reasons. Our fuel needle taper and profile is different (more aggressive) than the stock needle and delivers more fuel earlier off idle than the stock needle does so there is no need to change the pilot jet in most applications. Some people may do that with the stock fuel needle as a way to get more fuel earlier off idle than the stock needle normally delivers. You will get the best results with our kit by following the instructions provided with it using the stock pilot jet. There is normally no reason to change the pilot jet in trying to gain performance, as it mainly controls idle and there is no performance gain to be had at idle. This is why we use the same size pilot jet from the factory and do not change it. The airflow at idle does not have any velocity like when the bike is moving so intake and exhaust modifications such as high flow air filters and modified air boxes don't have any effect until the bike is moving. If you are using anything other than the stock OEM size pilot jet with our kit you most likely will bog the bike down in the early midrange.
The reason that our jets are a different size than the OEM is because our kit also changes the dimensions of the needles. If you compare the tip diameter of our needle to the stock one, you'll see it's likely thinner, which means more fuel can pass between the thinner needle and the emulsion tube than with the stock needle. This allows us to use a same size or possibly smaller main jet and achieve more fuel flow. Having smaller main jets also increases transient response by having a smaller cross sectional area for the venturi effect to pull the fuel. This will result in quicker throttle response.
The number of the jet represents the size of the hole, like other brand jets. For example, a DJ140 main jet has an orifice of 1.40mm; however, our jets do have a different taper leading to the hole than a other brands, which changes the dynamic flow rate of the jet. It will flow more in the midrange (slower fuel velocities) and more on the top end (higher fuel velocities) than a similarly sized jet from another brand. If you need any additional information or have any more questions please let us know. Thank you.
If you have any further inquiries, please contact us directly. By email reply at pstech@dynojet.com or by phone toll free 1-800-992-4993, we are open Monday to Friday 8am-5pm Pacific Time.
Powersports Technical Support
Dynojet Research, Inc.
Free: (800)992-4993
Yes this Stage 1&2 Jet Kit SKU: 4175 will come with Main Jets, however most of our jet kits do not come with pilot jets.
You can find the entire parts list in the installation guide, with this link: https://www.dynojet.com/jet-kit-for-y...
Once on the page scroll down and click on DOWNLOADS and you can upload the install guide.
Dynojet kits are designed to use the stock factory supplied pilot jet size for a number of reasons. Our fuel needle taper and profile is different (more aggressive) than the stock needle and delivers more fuel earlier off idle than the stock needle does so there is no need to change the pilot jet in most applications. Some people may do that with the stock fuel needle as a way to get more fuel earlier off idle than the stock needle normally delivers. You will get the best results with our kit by following the instructions provided with it using the stock pilot jet. There is normally no reason to change the pilot jet in trying to gain performance, as it mainly controls idle and there is no performance gain to be had at idle. This is why we use the same size pilot jet from the factory and do not change it. The airflow at idle does not have any velocity like when the bike is moving so intake and exhaust modifications such as high flow air filters and modified air boxes don't have any effect until the bike is moving. If you are using anything other than the stock OEM size pilot jet with our kit you most likely will bog the bike down in the early midrange.
The reason that our jets are a different size than the OEM is because our kit also changes the dimensions of the needles. If you compare the tip diameter of our needle to the stock one, you'll see it's likely thinner, which means more fuel can pass between the thinner needle and the emulsion tube than with the stock needle. This allows us to use a same size or possibly smaller main jet and achieve more fuel flow. Having smaller main jets also increases transient response by having a smaller cross sectional area for the venturi effect to pull the fuel. This will result in quicker throttle response.
The number of the jet represents the size of the hole, like other brand jets. For example, a DJ140 main jet has an orifice of 1.40mm; however, our jets do have a different taper leading to the hole than a other brands, which changes the dynamic flow rate of the jet. It will flow more in the midrange (slower fuel velocities) and more on the top end (higher fuel velocities) than a similarly sized jet from another brand. If you need any additional information or have any more questions please let us know. Thank you.
If you have any further inquiries, please contact us directly. By email reply at pstech@dynojet.com or by phone toll free 1-800-992-4993, we are open Monday to Friday 8am-5pm Pacific Time.
Powersports Technical Support
Dynojet Research, Inc.
Free: (800)992-4993
