Air injection plugs

lost californian · 06-18-2019, 10:28 AM

My understanding is that the little line coming from the intake is vacuum, big line is air inlet, and pipe is injection to cylinder. I can just plug the vacuum line, and then make a plate to cover the cylinder hole, and drop the system out of the bike, right?

Thanks, y'all.

**JerryHawk250** · 06-18-2019, 10:38 AM

Yes, That is correct.

Weldangrind · 06-18-2019, 11:19 AM

Where does the other end of the vacuum line connect?

2LZ · 06-18-2019, 11:45 AM

On Q, i wanted it to look like it was there, just in case. I put a BB in the small line and a piece of all-thread in the big line.

Keep in mind, it doesn't rob power and if you're keeping your stock exhaust with cat, you may want to leave it functioning. It'll keep your cat clean.

If you're going to an aftermarket muffler and no cat, disable the air injection or it will cook your muffler packing.

NzBrakelathes · 06-18-2019, 05:27 PM

Quote:

Originally Posted by lost californian

My understanding is that the little line coming from the intake is vacuum, big line is air inlet, and pipe is injection to cylinder. I can just plug the vacuum line, and then make a plate to cover the cylinder hole, and drop the system out of the bike, right?

Thanks, y'all.

I gave Motocheez a blacking plug for the head / he didn’t need it maybe he’ll send it?
There is a blanket I’ve bought in China before

lost californian · 06-18-2019, 07:43 PM

Quote:

Originally Posted by Weldangrind

Where does the other end of the vacuum line connect?

Right there

lost californian · 06-18-2019, 07:46 PM

Quote:

Originally Posted by 2LZ

On Q, i wanted it to look like it was there, just in case. I put a BB in the small line and a piece of all-thread in the big line.

Keep in mind, it doesn't rob power and if you're keeping your stock exhaust with cat, you may want to leave it functioning. It'll keep your cat clean.

If you're going to an aftermarket muffler and no cat, disable the air injection or it will cook your muffler packing.

Performed a cat-a-tectomy on the stock pipe. Now I have popping on decel, with occasional backfires, and JerryHawk250 suggested removing this to help with that.

lost californian · 06-18-2019, 07:47 PM

Quote:

Originally Posted by NzBrakelathes

I gave Motocheez a blacking plug for the head / he didn’t need it maybe he’ll send it?
There is a blanket I’ve bought in China before

Thanks for the info!

duck9191 · 06-19-2019, 09:19 AM

Quote:

Originally Posted by lost californian

Performed a cat-a-tectomy on the stock pipe. Now I have popping on decel, with occasional backfires, and JerryHawk250 suggested removing this to help with that.

Did you re-jet after removing the cat? the combination of extra flow in the exhaust and the pair pumping air into it could for sure account for the popping.

2LZ · 06-19-2019, 10:17 AM

Quote:

Originally Posted by lost californian

Performed a cat-a-tectomy on the stock pipe. Now I have popping on decel, with occasional backfires, and JerryHawk250 suggested removing this to help with that.

Definitively going to want to disable the air injection then, unless you have a deep hatred for your muffler packing. ;-)

Weldangrind · 06-19-2019, 12:17 PM

Quote:

Originally Posted by lost californian

Right there

That's really cool! A vacuum nipple in that location would be useful for tuning with a vacuum gauge. I'm inclined to drill my intake tube to install a vacuum nipple for that reason.

lost californian · 06-21-2019, 08:30 AM

I have removed the air injection stuff, and there is almost no popping on decel now. I had to buy a little vacuum cap for the carb nipple, and for now I just put a cap on the pipe on the cylinder. Drew a pattern on a piece of metal to make a blanking plate, but don't have time to cut it out right now.

On a side note, the one and only neighboring house burnt last night. Unoccupied, for years, a flipper bought it last year, made it nice, listed it for too much, and now its gone. Wonder if someone will buy the property and build again. Hope not.

**JerryHawk250** · 06-21-2019, 10:43 AM

Happy to see it helped!

Should be running good now.

I have a house next to me that has been vacant for two years. I wish it would either get bought and fixed up or just burnt to the ground. If I could afford it I would buy it and level it just to have the extra property.

Weldangrind · 06-21-2019, 11:25 AM

Quote:

Originally Posted by lost californian

On a side note, the one and only neighboring house burnt last night. Unoccupied, for years, a flipper bought it last year, made it nice, listed it for too much, and now its gone.

The insurance adjusters in the crowd would call that suspicious.

Stormer · 07-20-2019, 03:18 PM

Removed mine the other day and covered it with a blank and plugged the airbox nipple and the intake nipple. No more popping at all.

06-18-2019, 10:28 AM	#1
lost californian Join Date: May 2019 Posts: 34	Air injection plugs My understanding is that the little line coming from the intake is vacuum, big line is air inlet, and pipe is injection to cylinder. I can just plug the vacuum line, and then make a plate to cover the cylinder hole, and drop the system out of the bike, right? Thanks, y'all.
	1

06-18-2019, 10:38 AM	#2
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,552	Yes, That is correct. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
	2

06-18-2019, 11:19 AM	#3
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Where does the other end of the vacuum line connect? __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0

06-18-2019, 11:45 AM	#4
2LZ Join Date: Mar 2010 Location: Volcano, Ca Posts: 7,078	On Q, i wanted it to look like it was there, just in case. I put a BB in the small line and a piece of all-thread in the big line. Keep in mind, it doesn't rob power and if you're keeping your stock exhaust with cat, you may want to leave it functioning. It'll keep your cat clean. If you're going to an aftermarket muffler and no cat, disable the air injection or it will cook your muffler packing. __________________ "Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350
	4

06-21-2019, 10:43 AM	#13
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,552	Happy to see it helped! Should be running good now. I have a house next to me that has been vacant for two years. I wish it would either get bought and fixed up or just burnt to the ground. If I could afford it I would buy it and level it just to have the extra property. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
	1

06-21-2019, 08:30 AM	#12
lost californian Join Date: May 2019 Posts: 34	I have removed the air injection stuff, and there is almost no popping on decel now. I had to buy a little vacuum cap for the carb nipple, and for now I just put a cap on the pipe on the cylinder. Drew a pattern on a piece of metal to make a blanking plate, but don't have time to cut it out right now. On a side note, the one and only neighboring house burnt last night. Unoccupied, for years, a flipper bought it last year, made it nice, listed it for too much, and now its gone. Wonder if someone will buy the property and build again. Hope not.
	3

07-20-2019, 03:18 PM	#15
Stormer Join Date: Apr 2019 Posts: 2	Removed mine the other day and covered it with a blank and plugged the airbox nipple and the intake nipple. No more popping at all.
	0