popping and banging ???

Gday guys, oops and girls, I read somewhere on the site in the mechanical section about popping and banging (backfire) after you change the muffler, I have just fitted an IXIL with baffle removed and on overrun its like an M16 can some one help me with a cure, I have just done the airbox mod and the bike is running rich, yes I know it should be much leaner now but give it a rev and black smoke comes out, I am as soon as I have the moolah going to have the bike dyno'd and a power commander fitted at the same time, would appreciate your thoughts, oh and here's a pic of the bike.

Put "pair removal " in that little search box .

Most asked question i think .No cost fix .

exactly which pipe do you block off , there are two pipes coming off the reed valves and another going some where is that the one you block ??

The one going back to the airbox. there is a joiner halve way along

Thanks for that, its a simple fix but does it affect anything else ?? does it fool the computer into thinking its to rich and lean it off, its ok blocking it off but does it have any detrimental effect on anything else I just want the backfiring to go away until I get a power commander and have it all set up properly, as I said in the previous post its now running way to rich and it would be the unburnt fuel causing the backfiring, suppose I just want to know I am not going to bugger anything else up with a quick fix ???

The poping is due to the unburnt fuel in your system.
A crackle is generally heard. There is something wrong with your fuelling and a PC won't fix that.
Go back to square 1 and start again.

What airbox mod did you do? All the mods involve cutting holes and removing plastic somewhere, which make it run lean. Very hard to make a Bandit 1250 run rich without adding fuel with a TFI or a Power Commander, or by having a totally choked air filter (or very over-oiled somewhere). Is the smoke black, blue or is it the oil burning out of a new end can?

Hear what your saying and understand that it should be running on the lean side, but it is definitely rich, air box mod was three large round holes cut in the lid i did not go the whole hog and cut away most of the lid, air filter is as clean as a fat mans plate at the dinner table, mind you the standard muffler was sooty before I changed to the IXIL so I think the system needs remapping to lean it out, I bought the bike as a demo with 2000 ks on it and its now done 2700 ks so I recon it may have been wrong from day one and not so noticeable when it had the standard pipe on. Oh and its black smoke when you give it a rev you can see black smoke not a lot but it should not be there. And I should mention that since the muffler and air box changes the bike goes like the clappers much more responsive just a little rich and backfires.

2wheelsagain wrote:The poping is due to the unburnt fuel in your system.
A crackle is generally heard. There is something wrong with your fuelling and a PC won't fix that.
Go back to square 1 and start again.

If I went back to square one I would have to put the original muffler back on and plug the holes in the air filter box coz thats all thats been done so I cant see the point in doing that, and a PC should fix it coz it would lean out the mixture and stop unburnt fuel in the system dont you think ??

The popping(backfiring ) you are hearing is just air getting injected to burn any excess fuel. blocking the pair system off wont hurt it. i would let the black smoke for a couple of rides if you have just put the can on . let it clear its system since its not restricted up

If you think the bike is running rich, pull the plugs and confirm it one way or another. Don't guess at the state of fueling cause you can see black smoke or that the pipe is a bit sooted up. Black smoke is not always a sign of running rich, just one of the common ones that everyone knows of.
If it is running rich or way too lean, find out why and fix it before adding a PC or other power up mods

IMO if there is some sort of fueling problem, a PC will not fix it, just mask it.

So now it's running ok again. It sounded like a rag was left in there to me. Just a thought. But if it's now running well, then I guess not. Also, how many ks did you ride it when it was running "rich".

I think it was Rick, Who said he's was running rich when he got it. dynoed confirmed it.

Dyno will confirm it for sure. But I'm with Dhula... pull the plugs and check, sooty exhaust can be from running 98 octane. My tuner said run 95 and nothing else as 98 is sooty.

I've done all those mods and more and the only time mine had black smoke on throttle application was when I forgot to replug in the hose for the IAP after I did the throttlebody sync. Mind you the bike was running like a hairy goat. Plugged it back in and all fixed

Hang on guys we seem to be loosing it , I have a standard GSF 1250 with 2700 ks all I have done is put a link pipe with an IXIL muffler and done the airbox mod as far as I know the bike was running 100% before now the above has been done it backfires on the over run and I have noticed there is slight black smoke when I give it a rev, probably never noticed it before when original muffler was on now correct me if I am wrong but what mods I have done should not affect the bike drastically so I am thinking a pc with correct settings should solve the problem by leaning it out.