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'06 Speedmaster
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Discussion Starter · #1 ·
I’m trying to do a spark plug change on my 06 Speedmaster and every video I find (for some reason there are very few Speedmaster vids out there) either there is no extra rod next to the spark plugs at all, or they have just a screw down in there and that’s it.

This thing is in the way of me getting a spark plug socket down in there, and it’s not apparent (at least to me) how exactly to remove this thing without messing something up…
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It's an air injection system. Your bike will run fine without it. You can buy aftermarket plugs for it, but I think if you want a budget replacement, remove one and bring it to an auto parts place and compare the threads to replacement oil drain plugs. I think it's M12 or M14.
 
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'06 Speedmaster
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Discussion Starter · #3 ·
It's an air injection system. Your bike will run fine without it. You can buy aftermarket plugs for it, but I think if you want a budget removal, remove one and bring it to an auto parts place and compare the threads to replacement oil plugs. I think it's M12 or M14.
Sweet! Thanks for the hella quick reply!
Also, is this an aftermarket part?
 

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It's a factory emissions device.
Most of the America & Speedy owners have binned them straightaway.
 
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'06 Speedmaster
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Discussion Starter · #5 ·
So to remove the whole system I need to remove that gray metal box mounted under the frame too? Looks like that box has a hose going back to the air box- I’d need to plug that hole on the airbox too then?

Or is there a simpler way to disable the whole thing?
 

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'06 SM 865, Sceptre Exh, Uni Pods, 45p/148m, NBZT Needles, SAI X'd, Nology Coils, TTP S1 CDI
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@willman42

Order this Air Injection Removal Kit from New Bonneville; or, this Low Profile AI Removal Kit from Triumph Twin Power.

Both kits contain precision machined parts, new copper sealing gaskets, vacuum/airbox plugs, instructions, etc. (I have the NB kit installed on my bike.)

For ease of ordering and shipping considerations, New Bonneville is in Texas, USA; and, Triumph Twin Power is in the UK.
 

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'06 SM 865, Sceptre Exh, Uni Pods, 45p/148m, NBZT Needles, SAI X'd, Nology Coils, TTP S1 CDI
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So to remove the whole system I need to remove that gray metal box mounted under the frame too? Looks like that box has a hose going back to the air box- I’d need to plug that hole on the airbox too then?

Or is there a simpler way to disable the whole thing?
@willman42

Yes, scrap that too! Basically, just order one of the two kits from the vendors I supplied links to and, when the parts arrive, remove and trash those pipes, the gray box and whatever hoses attach to it. The instructions provided in the kits explain everything.

Regards,
CFM
 

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Sweet! You guys are awesome!!
Basically all you need to do is remove all that is attached. Install the two plugs you picked up from the local auto parts store. Additionally There is a large hose going to the airbox, remove that as well and install a plastic plug in it's place. Easy peezy and nice and cheep.
 

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'06 Speedmaster
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Discussion Starter · #11 ·
So yeah I definitely thought about that vs. the $25 kit + shipping from newbonneville.com, and I'm confident I could easily get an M13 bolt for the "engine" (not sure exactly what the chamber is that it screws into... ignition chamber?).

My concern is the plastic plug for the airbox. AFAIK unlike screws/bolts there are no standards for sizing plastic holes so whatever I get would just have to be trial and error until I get something that just seems to fit. But then I worry when I put the bike under load that plug will get messed up somehow- either through vibrations, heat, weather, or maybe it doesn't provide as good a vacuum seal as I thought it did. And then I'd be on the highway with compromised vacuum in my airbox...
 

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'06 SM 865, Sceptre Exh, Uni Pods, 45p/148m, NBZT Needles, SAI X'd, Nology Coils, TTP S1 CDI
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That's why I suggested the kits from NB & TTP - because they contain ALL the parts you'll require (and you won't have any "trial and error" fitment issues)! There are other vendors/sources for these but those two currently have the lowest pricing (and NB is in Texas so you'd likely have the kit in only a day or two).
 

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2015 Triumph America. 2014 Honda VFR800f 2022 KLR650
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To the best of my knowledge the air injection doesn’t go in to the combustion chamber, it is injected just behind the exhaust valve, it’s purpose is to assist any unburnt fuel to ignite, which is why it can cause backfiring on deceleration. Fixed the backfiring on my 2015 America.
 

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Discussion Starter · #15 ·
To the best of my knowledge the air injection doesn’t go in to the combustion chamber, it is injected just behind the exhaust valve, it’s purpose is to assist any unburnt fuel to ignite, which is why it can cause backfiring on deceleration. Fixed the backfiring on my 2015 America.
Well I like the backfiring on decel haha so maybe I should reinstall this air injection thing?
 

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So yeah I definitely thought about that vs. the $25 kit + shipping from newbonneville.com, and I'm confident I could easily get an M13 bolt for the "engine" (not sure exactly what the chamber is that it screws into... ignition chamber?).

My concern is the plastic plug for the airbox. AFAIK unlike screws/bolts there are no standards for sizing plastic holes so whatever I get would just have to be trial and error until I get something that just seems to fit. But then I worry when I put the bike under load that plug will get messed up somehow- either through vibrations, heat, weather, or maybe it doesn't provide as good a vacuum seal as I thought it did. And then I'd be on the highway with compromised vacuum in my airbox...
Don't overthink this man. Put a piece of black gorilla tape over the hole on the airbox and ride it.
Or jump on the interwebs and order a kit.
 

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To the best of my knowledge the air injection doesn’t go in to the combustion chamber, it is injected just behind the exhaust valve, it’s purpose is to assist any unburnt fuel to ignite, which is why it can cause backfiring on deceleration.
I stand (sit) corrected.
Right you are.
 

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Discussion Starter · #18 ·
Wait so that sounds like it actually has a meaningful use- wouldn’t unburnt fuel build up somewhere without this air injection system in place burning it off?

If it’s merely an EPA mandated thing then whatever I don’t care. But if it provides an actual performance or bike health benefit then I’d want to leave it on right?
 

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2015 Triumph America. 2014 Honda VFR800f 2022 KLR650
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No the fuel doesn’t build up, the small amount of unburnt fuel simply travels out the exhaust. The amounts we are talking about are very small though. Yes the more environmentally conscious among us would say leave it connected and they are of course correct, however the constant backfiring on deceleration really got on my nerves. I figure it’s a 865cc engine not 1300cc or more so I’m being environmentally conscious riding a smaller motor anyway. 🤔
 
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