4/21/2021 0 Comments Carburetor Jetting Explained
These main jet sizes are 1 size up from stock on the 07 model year bikes.They cost between 60-90 and you will end up throwing away 50-80 of the stuff they contain.Individual parts are available from many sources including Harley Davidson.
Follow all of the instructions below, including the use of jetting chart and simply purchase the jets listed. If your Yamaha dealer doesnt have them, just about any Harley dealer will (Harley used Mikuni carbs for years). Make sure you get the small round main jets and all will be well We rarely change the needles, as the stock ones perform very well and the tuning charts presented on these pages reflect using stock needles. Carburetor Jetting Explained How To Change TheThe 2 Links Below Are Required Reading For Anyone Not Familiar With These Carbs CARB THEORY 101 Mikuni Carb Tuning Guide Required Watching CV Carb Function Video Carb Schematic: The Functioning Carb Jetting Instructions THE JETTING BIBLE - or - How To Change The Jets on a V Star 1100 Step By Step Guide NOTE: This is a How To guide for jetting the Mikuni carbs on the V Star 1100. ![]() VERY IMPORTANT After changing jets or removing the carbs from the bike for any reason, they MUST be synched. It is also good practice to check the synch at least once a year. NOTE: When removing the carbs from the bike (per above instructions) remember to loosen the hold-on clamps all the way. This will make it much easier to get the carbs back into the bike. Also, use a little spit in the carb flanges that go into the engine holes - its a good temporary lube and will dry out - so the carbs will not pop out later, which can happen if you use a true lube (oil, grease, etc) Some supplemental pictures - courtesy of drenfro22: 1. Late models - 4 Connectors to separate - Also shows breather hose (was connected to air-box) 2. Boot connection to air-box (rear cycl.) 4. Boot connection to air-box (front cycl.) Carb Jetting 101: The Basics. In above drawing Pilot air screw and jet PMS screws Throttle valve cutaway Pilot Jets in terms of working range Needles Needles Main Main Other Jets - ones we do NOT need to change unless specified by an aftermarket manufacturer: Pilot Air Bleeds - no change except to undo mistakes by poor jetting Starter Jets - Used by the starting process, advancing the choke enricher lever opens access to this jet, enriching mixture to aid in starting. Needles: Removing shims Leaner Adding shims Richer When adding a shim you are moving the taper away from the opening and allowing more fuel to pass. ![]() Barons Big Air Kit - Input from Squirrel aka Rob Lewis I would like to share what I learned installing a Barons Big Air Kit on my 07 1100 Classic. My setup is: 07 Classic Cobra Slash Cut Slip-ons Comet BAK Altitude: 1058 feet 17.5 Stock Pilot Jet Stock Starter Jet 117.5 Front Main Jet 115.0 Rear Main jet Stock Needles with 1 shim Stock float height The Barons air kit arrives with a jet kit for the 1100 Mikuni carbs. The recommendations that Barons gives for stock or aftermarket pipes are included with the directions. They provide original Mikuni main jets in 107.5 110 for Stock bikes, and 112.5 115 for aftermarket pipes.( Slip-ons, or Full Systems). Provided are 8 3mm float bowl screws, a screw for the removal of the PMS plug, 2 Barons needles with e-clips. Note: these are DynaJet needles) I installed the recommended main jets of 115 front 112.5 rear, with Barons needles on the 4th notch and PMS set at 4 turns out. Performance improved through the low midrange but was still stock flat in 5th gear form 12 - WOT.
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