Brozz exhaust

[Hancadam]

Hi everyone.

I put the eBay/Amazon exhaust that everyone buys on my Brozz. Really happy with how it turned out. Fits perfect, but did take some tinkering. I have around 3/8 to 1/2 inch clearance from the air box. Cleared everything else easily. Had to make a bracket for the rear mount.

Definitely helps out with adding a little power.
Sounds great.

[Hancadam]

Also, I had to trim more of the rear fender/mud guard out of the way. The clutch lever arm was just a little too close, so I peened the pipe in slightly. Didn't want it rattling.

Price on eBay was $89.

[2LZ]

Sounds about right on the project! Glad you like it!

[Megadan]

Turned out nice. You had some of the typical fitment issues we all tend to have. I got lucky that my head pipe cleared everything on the engine just fine, but if I was planning on keeping my stock air box I would have been SOL. Thankfully I was able to utilize the rear grab handle bolt with a spacer for my muffler mount this time around, but I did have to flatten out a small section near the rear of the frame just to buy it a small air gap. It wasn't touching, but it was close enough I would need a feeler gauge.

[Hancadam]

Thanks 2LZ and Megadan!

I ended up mounting the bracket I made to the rear grab bar bolt as well. It actually mounted up without the bracket, but was then close to the air box. The bracket luckily allowed it to drop into a better position.

I love how it's changing colors with heat cycles. Looks very cool to me.

Also, I removed the smog pump and capped off the air box/intake lines.

[tarote9025]

Originally Posted by Hancadam

Also, I removed the smog pump and capped off the air box/intake lines.

Whats the benefit of doing that? Is it basically an egr delete and allows the notor to run more efficiently?

[2LZ]

Originally Posted by tarote9025

Whats the benefit of doing that? Is it basically an egr delete and allows the notor to run more efficiently?

It's not an egr. It's a fresh air injection into the exhaust port to toss fresh oxygen on the hot cat to help it do its job. Once the cat is removed (new exhaust), that air injection will be tossing fresh oxygen on your new muffler packing.
Best to disable it if you remove the cat.

[NzBrakelathes]

Originally Posted by 2LZ

It's not an egr. It's a fresh air injection into the exhaust port to toss fresh oxygen on the hot cat to help it do its job. Once the cat is removed (new exhaust), that air injection will be tossing fresh oxygen on your new muffler packing.
Best to disable it if you remove the cat.

Incorrect Sir.

The vacuum from intake opens the valve under the tank and allows the exhaust gasses to be recycled into the air box.
THAT IS only if the valve is REAL - yes I have seen them FAKE not able to ever function.

Take it all off and if popular I could supply the blanking plugs or do as some ppl do just cover the hole etc or cut a gasket without a hole n leave it all as if it is connected.

[tarote9025]

Originally Posted by NzBrakelathes

Incorrect Sir.

The vacuum from intake opens the valve under the tank and allows the exhaust gasses to be recycled into the air box.
THAT IS only if the valve is REAL - yes I have seen them FAKE not able to ever function.

Take it all off and if popular I could supply the blanking plugs or do as some ppl do just cover the hole etc or cut a gasket without a hole n leave it all as if it is connected.

Whats the benefit of removing it?

[Megadan]

Originally Posted by NzBrakelathes

Incorrect Sir.

The vacuum from intake opens the valve under the tank and allows the exhaust gasses to be recycled into the air box.
THAT IS only if the valve is REAL - yes I have seen them FAKE not able to ever function.

Take it all off and if popular I could supply the blanking plugs or do as some ppl do just cover the hole etc or cut a gasket without a hole n leave it all as if it is connected.

Actually, you are incorrect sir. It is an air pump. Known as a pulse air injection pump (aka PAIR ). It uses a line from the intake between the carb and cylinder head to create the pulses needed to drive the pump. This draws fresh air from the air box via another line to the air box, to the pump and then pumps fresh air into the hot exhaust path to help burn off any unburned hydrocarbons and aid in the catalyst function.

If you need any other proof, the simple fact that all of the lines in the system are rubber should be a clue, especially the unit off of the head. If it was true EGR, they would have to be metal for the simple fact that they would melt/fail rather quickly with up to 1000 degree exhaust gasses passing through them.

Other proof that it is not EGR is the simple fact that it is a pump. True EGR doesn't need a pump to function, just a valve. The extremely hot exhaust gasses are also very high pressure, and don't need assistance in traveling through a pipe.

This is the same basic system found on almost every emissions compliant bike sold in the U.S. No bike comes with EGR, but they all have a PAIR system and a EVAP charcoal canister (aka, TT250) as part of 50 state compliance.

Further evidence of this is a TT250 with an exhaust installed on it makes lots of nice after fires (proper name for what people call backfires, which actually go through the intake). This is the same reason why other big name bikes with exhausts block off or delete the pair system when an aftermarket system is installed. The extra oxygen in the system causes unburned fuel to essentially ignite on its own within the exhaust.

[tarote9025]

Thanks megadan im used to working on cars so egr is what popped in my head i did have a scooter with a pair system on it is there any real benefit to removing it?

[Megadan]

Originally Posted by tarote9025

Thanks megadan im used to working on cars so egr is what popped in my head i did have a scooter with a pair system on it is there any real benefit to removing it?

Performance wise there is no real benefit. It just stops lots of popping and flames from traveling all the way through the system (Why 2LZ stated it will save the muffler packing). Beyond that, it just cleans up and simplifies the bike and removes a little weight.

[pete]

ok.. what it is or what it is not....

but the short is if you remove the AIS and not the cat
the cat will clog up faster....


...

[NzBrakelathes]

Originally Posted by Megadan

Actually, you are incorrect sir. It is an air pump. Known as a pulse air injection pump (aka PAIR ). It uses a line from the intake between the carb and cylinder head to create the pulses needed to drive the pump. This draws fresh air from the air box via another line to the air box, to the pump and then pumps fresh air into the hot exhaust path to help burn off any unburned hydrocarbons and aid in the catalyst function.

If you need any other proof, the simple fact that all of the lines in the system are rubber should be a clue, especially the unit off of the head. If it was true EGR, they would have to be metal for the simple fact that they would melt/fail rather quickly with up to 1000 degree exhaust gasses passing through them.

Other proof that it is not EGR is the simple fact that it is a pump. True EGR doesn't need a pump to function, just a valve. The extremely hot exhaust gasses are also very high pressure, and don't need assistance in traveling through a pipe.

This is the same basic system found on almost every emissions compliant bike sold in the U.S. No bike comes with EGR, but they all have a PAIR system and a EVAP charcoal canister (aka, TT250) as part of 50 state compliance.

Further evidence of this is a TT250 with an exhaust installed on it makes lots of nice after fires (proper name for what people call backfires, which actually go through the intake). This is the same reason why other big name bikes with exhausts block off or delete the pair system when an aftermarket system is installed. The extra oxygen in the system causes unburned fuel to essentially ignite on its own within the exhaust.

Good night mate
You have that well deserved rest

[Megadan]

Originally Posted by NzBrakelathes

Good night mate
You have that well deserved rest

Prove me wrong or don't bother speaking.

Go show me an EGR system with rubber hoses running between the exhaust and intake. Or the fact that pretty much every EGR system on the planet runs the EGR directly from the exhaust port/manifold directly to the intake manifold and NOT the air box, which it would promptly melt. I don't know if you heard, but in case you missed the memo, exhaust gasses right out of the exhaust port are close to or beyond a thousand degrees Fahrenheit. Those kinds of temps make short work of most plastics and rubbers. There are exceptions, but they aren't found on these bikes.

You know what does run between the airbox and an exhaust port that also uses pulsation or port vacuum to drive along with rubber hoses that draw clean filtered air from an air box? A PAIR system.

Well, since you seem to think I am completely ignorant and only the big manufacturers know what they are talking about (how could I, a guy with years of training and experience, possibly know). Let's see what CSC calls it?
https://store.cscmotorcycles.com/TT2...p/zt16-101.htm
Look, they call it an Air Pump. *shocked face* Not an EGR valve. That sting to your ego will go away, eventually. Also. don't forget that according to you these "big manufacturers" know more than little old me. Saying they are wrong now would disqualify every other attempt you have made to tell me I was wrong in your passive aggressive little way.


Anyway, I tire of you, but I want to leave you with a little pearl of wisdom for the next time you make a post about how you are so unfairly treated because you paid money to be a sponsor/vendor/etc.

Respect is earned.