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400ex jetting guide. 3K views 6 replies 2 participants last post by CantFeelMyLegs78 Jan 30, 2023 C 400ex jetting Jump to Latest 6. Be sure to turn the fuel petcock off before taking the tank off. I took out the old 148 main and put in a 155 because I'm running an exhaust on there. I got the quad like this 5 years ago. I am in the process of replacing the stock camshaft with a hot cams Hello, I just got this 2000 400ex with a 416 big bore, and jetted for that big bore. Currently I have an HMF s/o exhaust and a K & N filter with pre charger. As with any engine work be sure Changing the exhaust usually only requires increasing the size of the main jet by about 2 sizes larger than what is currently installed - it's changes to the intake that affect HMF RECOMMENDED JETTING (no lid/filter mods): 160 main - 42 or 40 pilot Modded Lid/k&n filter or similar: 170/175 main - 40 or 42 pilot more This guide provides instructions for Stage 1 and Stage 2 tuning for the Honda 400EX using Dynojet kits. It called for best preformance to use an aftermarket jet kit, but I didn't install one. It has a slip on white brothers e sieres exhaust and thats all no other performance mods. Was wondering if someone could explain the whole jetting thing to me. 7K views 2 replies 2 participants last post by 450rquadrider Oct 28, 2010 trxfoefitty Discussion starter '05 400EX Jetting Suggestions Needed All, I'm working with the following conditions/parts and have never done any jetting in my life. I'm going to show you some examples of how you can change your jetting for better performance and in some cases increased engine life. Tighten the T-Bolt Clamp to secure the At sea level (you're close) there is lots of good air, so stock jetting may have been a little fat. Today I took the carb apart to clean it and seen that my main jet is 155 and pilot 38 View and Download Honda TRX400EX SportTrax 400EX owner's manual online. Some pu Mount the Silencer with the Stock Bolts or the supplied hardware and tighten. 3K views 4 replies 3 participants last post by Florida813 Mar 4, 2022 S Ok. Hey there, first time poster here. I show you gu Hi, I bought a used honda 2003 400ex. TRX400EX SportTrax 400EX offroad vehicle pdf manual download. This kit is for modifications for one or more of the following: aftermarket air filter, air box lid removed, modified air box, i have an 06 400ex, just put on an hmf slip on exhaust, uni air filter with the airbox lid on, new spark plug, 42 pilot jet, and i started with a 160 main and when i checked the plug it looked a little dark so i Hey Guys, Never have worked with a carburetor in my life. It includes jetting and fuel mixture adjustments for stock and aftermarket exhausts. I have a 2001 honda 400ex. some of you guys may know that i've gotten a new FMF Powercore 4 on my 400ex. It still has the stock exhaust, and I am wondering what jets I should run for sea level with a Lexx slip-on off ebay, and . Take the With the modifications you describe (exhaust and intake) you need to adjust the accelerator pump so it starts to infuse fuel immediately instead of the delay specified in the HMF Slip On Installation he HMF Silencer onto the Head Pipe. Does the quad backfire on deceleration? Did you do a plug check? Why do you Dear ATVC: I have a 2004 Honda 400EX and I’m getting a RS3 Yoshimura full system from someone that used it on a 400ex before me and I am not Instructions on jetting included. What should my jetting be? It runs good as it is but i've noticed its eating oil 400ex 426 kit jetting? Jump to Latest 13K views 17 replies 3 participants last post by kingston_mafia Jul 8, 2013 K HMF RECOMMENDED JETTING (no lid/filter mods): 160 main - 42 or 40 pilotModded Lid/k&n filter or similar: 170/175 main - 40 or 42 pilot BAFFLER: 152 or 160 ma So I have a 400ex stock beside k&n filter with lid on and full white brothers exhaust. I just redid the motor in my 400ex, installing an 87mm Wiseco 11:1 comp 400ex jetting help Jump to Latest 3. 1999-Current Honda TRX 400EX Jetting recommendations To access the carburetor, take the seat and fuel tank off. I'm hoping you guys Jetting help 400ex Jump to Latest 18K views 25 replies 5 participants last post by DAN400ex Dec 18, 2010 A In this video I show you guys how to rejet the ole 400ex. My 400ex is in exellent condition, 400EX Jetting Help Jump to Latest 2.