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If the mechanic did not replace the exhaust pipe gaskets in the head or on any connections between the head pipes and the mufflers , the air leaks could be igniting unburned fuel in the exhaust , causing the popping and back firing. Try replacing any gaskets in the exhaust system. If you have a flat spot or hesitation when accelerating than you probably also need to rejet the carburetors. Bigger main jets should fix that condition. A jet kit may also contain differently tapered needles for the slides to help compensate for the change in the acceleration curve.
You can try driving the bike after the install. After you change the exhaust it will run lean. You may want to coat the inside of the mufflers with an anti blu-ing agent or your headers will discolor. If when test driving you notice the bike has developed a flat spot in the acceleration curve you will want to re-jet the carburetors. The easiest way is to buy a jet kit from Cobra, Dyna-jet,etc.($80-$100). Other wise you can just buy several sets of larger jets and change them out till you are happy with the way it runs. Most people that change the mufflers and put in a jet kit, also install a K&N air filter . More air flow + fuel flow = more exhaust flow (more power)
red pipe is an indicator that the cylinder is getting too much fuel. The fuel is actually burning up in the exhaust pipe. I would hope it is something simple like a vaccum hose came off, but I would try spraying starting fluid around the carb while it is running(still cold though). If the engine revs up, it has an air leak somewhere. Hope this helps...
First, determine which cylinder is bad. Touch the exhaust pipes to determine which is hotter.(the pipes get VERY hot so be quick or use a non-contact thermometer.)
Remove and look at the bad cylinder's plug, if ti's wet you are getting fuel, try replacing it. (Heck, replace it anyway.)
If there is no fuel on the plug the carburetor might be plugged or need cleaning.
First off did you buy it new? Second has it gone through its break in tune up yet?Did you do the re jeting? My guess is it was re jeted wrong & neeeds to be re jeted again or could also need more air(upgraded air kit) or a tfi or power comand fuel mod.My bike also poped untill I did the air & fuel upgrades & them upgrades will also give you a much needed house power needed for this rig.
No it will not. You probably don't NEED to rejet at all. If the manufacturer suggests it for your bike and pipe combination I would follow their advice. If they do not suggest it I would use a dyno to get the best performance from your new setup. Keep in mine your new exhaust only lowers the back pressure. You haven't changed the intake parameters at all as far as airflow. So any additional air going into the cylinders due to your new exhaust will only be because of the reduced volume in the cylinder while the intake valve is open. This is a rather small amount, so don't get all crazy and jump several jet sizes at once.
pull the breather cover off and see how it does it sounds like you need more air going in when you go up on jet size it will change the air fuel ratio thus making it lack power or just run absolutely funny