I just put on a new set of Hooker Troublemakers, free flow baffels. TP 107ci. I get a little poping and occasional back fire on the decel, is this normal or am I lean or have exhaust air leak?
Thanks,
zen

 

your lean will need to resdjust or re jet depending on plug readings....heres a link that will help its for cars but is a really indept write up on plugs

http://www.dragstuff.com/techarticle...ead-plugs.html

 

had the same problem with a bike fixed problem by leaning jets 1 at a time make sure accelator pump ia addusted correct. sound like you are getting 2 much fuel 2 me Not lean as stated in previous post

 

backfire out of the exhaust = rich. backfire out of carb= too lean ,from my personal experience. exhaust leak can cause the decel pop

 

i might stand corrected...sorry if i am...usally when you open up the exhaust or intake it leans it out.....but the plug reading will tell all

 

That's the way I understand it too rickgmi. Free flowing intake and exhaust will lean it out. I've heard an explanation for the decel popping that makes sense to me, but I am not a subject matter expert. What I was told was that when you close the throttle at high RPM's leaving the clutch out, the engine keeps running at a fairly high RPM. Since throttle is closed, a small amount of fuel is introduced through the low-speed jet. There isn't enough fuel in the cylinder for complete combustion, so some gets fed into the ehuaust where it can ignite making the popping. I reduced significantly (but didn't completely eliminate) the amount of popping I get on decel by opening the idle mixture screw about 1/4 to 1/2 turn. I think I am running a little rich at idle due to this, but the bike seems to run very well and no fouling of plugs.