BuggyDepot.com Tech Center 2.0   Categories: All Articles [31] Maintenance & Troubleshooting [3] BDX Install Guides [9] GY6 Performance Advice [3] Service Manuals [0] How It Works! Writeups [5] General GY6 Information [5] Weaknesses & Fixes [1] Modification Ideas [0] BuggyDepot News   We're Moving! Shipping Times Not Affected, But Phone Is Down Tuesday, June 1, 2010 BuggyDepot.com December 2009 Newsletter Wednesday, December 9, 2009 All Crossfire 150R Parts In Stock! Friday, October 9, 2009 Yerfer .net Content Available On BD! Tuesday, March 24, 2009 Slow Loading Times Today 3/23/09 Monday, March 23, 2009 Please note...   Content is copyright © 2005 - 2010 Buggydepot.com PROPERLY SELECTING AND INSTALLING CARBURETOR JETS [7,247 views]   A guide explaining how to properly select jet sizes, and installation on PD24J carburetors. Properly Selecting And Installing Carburetor Jets [7,247 views - 0 comments - Rating 5/5 ] Sizing at sea level: With UNI filter 120-125 With UNI filter and low restriction exhaust 130-135 With UNI filter, low restriction exhaust, A12 cam, performance coil & CDI and NGK Iridium spark plug 135-140 Test procedure: 1. Run engine at less than half throttle a minimum of 15 minutes to close electric choke 2. On a 300' or 100 meter stretch or greater, run the engine at wide open throttle 3. While still holding the gas pedal to the floor, cut the ignition 4. Remove the spark plug and inspect end for color a. White - Increase jet size b. Tan/Brown - Correct jet size c. Black - Decrease jet size 5. Clean spark plug with brass wire brush and check the gap prior to next test run Hints: 1. Change jet size by 2 or 2.5 for fine adjustment by 5 for coarse adjustment 2. Reduce jet size by 2 or 2.5 for every 1500 ft or 500 meters of elevation 3. Stock fuel delivery may not be sufficient above a 130 main jet and may require larger diameter fuel lines and less restrictive fuel filter 4. Once main jet is selected, the air/fuel mixture screw can be adjusted for optimum idle Thanks to PGHRUBY for this writeup! This article has been downloaded 7,247 times 0 comments about this article: Write a comment: Was this article helpful? 5/5 - Extremely Helpful! 4/5 - It's good! 3/5 - Needs more detail... 2/5 - Should be revised... 1/5 - Re-do this one... Are you a human? Type "yes": You can rate this article without commenting... Just select your rating and leave the comments form blank!