I've read a few folks have problems with popping when they install aftermarket exhausts. I have the Yoshi 4:1 system, and do occasionally get the odd back talk from the big girl, but honestly not too often. I thought I would pass along something my tuner mentioned for those who may not know.

This applies to the Yoshi system with the sound baffle removed, and possibly others that may have a removable cone. My tuner mentioned that when he removed the baffle, the resulting left over screw hole made the bike pop like crazy. He had to plug the hole with a small bolt and nut, which got rid of the extra popping.

YMMV,

-Matt

Mine still has the plug in it and it talks back to me.

I can't imagine that plugging a little screw hole would eliminate the poping but it's worth a try for sure. Thanks.

By the way, the pop isn't really all that bad to me.
It doesn't happen that often in "normal" riding.
Kind of adds a bit of character.
And it adds a bit of fun to a night ride for your buddies riding behind you watching the "fireworks".

I hope mine pops.

Just to clarify, mine still pops too. But, apparently it was popping MUCH worse until he blocked the hole. Seems hard to believe, but the tuner told me it made a big difference.

-Matt

Mine still does. It's the fuel shut off, usually will happen around 3500 with throttle closed under engine braking. If you'll keep the throttle cracked just a hair it won't do it or when the tach drops just under 4k pull in the clutch and release it and she won't back fire.

Try this, go to brocks web site and look under the instructions for installing the exhaust system. You will see a little plastic plug that he sends with his exhaust systems it plugs the hole in the bottom of the air bbox and the hose to the emissions system at the same time.. Since I am a jet Mec. I looked araound and found a cap just like it at work, they come on parts and tubes. Installed it and it worked great no popping! Who ever needs one let me know I got a bunch of them, they are yellow instead of red.

* Last updated by: buck20 on 7/20/2009 @ 1:00 AM *

I have the R77 CF unplugged and loved that POP! is not that often though.

Buck20, how can I get a cap from you?

I have to say that I like the occasion pop. Reminds me of the drag cars at the track. I run M4s uncorked and it just plain rumbles, not a ton of loud pops, but the down shift sounds sick.

Yo! I have been away from the forum for awhile, Jason send me your address to robert.lowman@honeywell.com and I will send you a cap! It works man, I hated that popping noise it made it sound like a piece of shit.

There are different kinds of "popping" you can get. One is the backfire which sounds like a starter pistol. The other is a low rumble of a backfire nature which is pretty consistent. Matt mentioned the screw hole problem. I can tell you from experience that just a pinhole in the system, usually at the point where two pipes clamp together, will cause an abnoxious backfire. Look for an arrowhead shaped black carbon mark at the joint.
I agree with hamr56, the low rumble when engine braking is sick. It gives the engine a very powerful aesthetic. As long as it is a rumble not a crack, I wouldn't worry about it.

* Last updated by: Sharkey on 8/13/2009 @ 1:01 PM *

Schnitz Racing makes 2 different TRE's for the zx-14. On there website one says to use to get rid of that popping sound. I put it on mine and got rid of 90% of the popping sound

Yep the nuetral tre will get rid of 99.9% of the backfires...but you'll still get a nice little rumble on deceleration...which I actually liked, sounded mean

i actually like that after firing going on when you come off the higher rpm range with engine braking, you should see that flame coming out the back, its like a torch sometimes lol, it does no harm to the engine, just a little extra fuel passing through the engine that gets burned up in the pipe

I think RidgeRider found something to that effect. Something like, "high cut" and "low cut." It's one or the other.

Code or no code. Howie, I'm going for the briefcase.

no clue, all i know is that a lot of people pay a good penny to get that little after firing put on their bike, something we get for free with the aftermarket exhausts lol

had the poppin prob with the m4's i put on. paid $50 for a map from this guy and popin virtually gone. plus runs much smoother and way better throttle response

http://www.faic.cc/index1.html

My 14 has a bad back fire under engine braking at around 3500 rpm.....very loud!....I'm running a yoshi 4 into 1 system....would having it dyno tuned help get rid of this?...it has the PC3 on it as well.....to me it is very annoying.....thx for any input.

I like when mine pops at night lol

From 02/05/2009 ???
From 02/05/2010 ???
From 05/25/2011 ???

Rusty Tuned. Who the why hisecret is safe with me.

I have a low rumble very rarely will she pop its sick

interesting...anyone have pic of the plug on/near air box that may not have been done when they changed to a 4 into 1?...I'm thinking this may be my problem. dont really care to ride it when it is back fireing on engine braking...will ride my zx-11 until this gets resolved......

Watch,

I am watching you park a faster bike till a pop is done.
The pop is done. I am watching you ride a slower bike that WAS the worlds most torque'd bike so it's still is the top dog in TQ not HP.

That said, you have a jumper if you remove the PC. You have 6hp lost, according to Slow, right out of the box and wired up no matter the map.

And finally, I probably have more HP than you and am bone stock. You went in the wrong direction say yes I did if I want HP or MORE noise with less HP.

You stay here, guard the HP. I'll go out and get the beer. Remember, you stay here, don't move. YOu sorta got your "input" really put the shoved right up dare?!

* Last updated by: Hub on 5/27/2011 @ 6:16 PM *

I just want this thing to run right and not pop when I engine brake.....HP is of little concern to me as long as she be running correctly, Primary reason I got this bike was, it fit me, as I am 6'3''........as I bought the bike in this state, I guess it should be expected to have a few issues I needed to deal with. The valve cover oil leak was a bit annoying...but not as much as this Popping......I'm still getting used to how well it handles compared to my 11, as well as how light it is.....