I have 2007 vtx 1300 cobra pipes, hypercharger. Have had it at 2 different shops for rejetting and still runs way too rich at idle and low rpm(in town riding)mid and upper rpm's runs great. after installing hypercharger had to rejet w/smaller than stock jets. Please any suggestions

The K and N filter should come with complete instructions including any rejetting information you might need (if you need to rejet at all)

Rich, there are no recurring issues with the vtx, but one thing i have seen a lot with the vtx's is when they sit around and especially when they are for sale and get started a lot with out being ridden the plugs get fouled easily. i would suggest you check and replace the plugs if they are carboned up and black. also you may want to get a fuel additive to help clean out the tank and carb, i like the lucas fuel conditioner myself.

May be running too lean or too rich. Check the color of your plugs, black dry and sooty means they are rich, white with blisters lean.

a back fire is to much fuel going down the exhaust and igniting, if you changed the exhaust pipes or allterd the air cleaner you will need to get it set up on a dyno . the air flow meter could allso be playing up a dealer repair really.

great news you can only win with this. i bet if you pull a spark plug and look at it, it will be white or close to it. if so your motor is lean, it's not get the right amount of gas. when you put pipes on a bike it lets more air flow and you need to jet your carb. you local bike shop can help you get a jet kit and handle the install if needed. when done right you get more performance out of it. while you are look into jets get a high flow air filter or look into a hyper charger they come a jet kit, k&n air filter and the air scoop price isn't bad rsports.com/wps/Honda_OEM/HondaMC.asp?Type=13&A=474&B=25

Your bike is running lean (too much air and not enough fuel). What, if any, modifications have you done to the bike? If you changed the exhaust out for louder pipes, you need to adjust the f/a (fuel/air) mixture in the carburetor to compensate for more air going through the bike. Let me know here if you have made any type of mods to the bike.

make sure bike has high performance air filter to coincide with the jetting,very important

hi buddy its simple one is the idle and the over is the air mixture screw just turn it all the way in and unscrew it so many turns (says this in manual eg 2 turns out ) get back to me if not right

it is not hard to do but it would be best to get the drag pipes. there are a host of problems to think of though. you will need to rejet the carbs to accomodate the free up in back pressure. you will need the tourque slipins for the pipes. they will fit right into the pipes where they connect at the heads. the 1300 is going to be super loud without the baffels. like getting stopped by the law loud. it would be best to get a tuned drag setup from a dealer as to get the sound you are looking for as well as keep it below jonnie laws radar.

If you have used Dyno jet kit I have had a kit come through with smaller main jets than the stock ones causing it to run way to lean.