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Ok, so I finally got around to taking off the airbox and trying the Secondary Air Injection removal.
Exhibit A; the offending party.
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I took off the tank, removed the two mounting screws which hold the airbox on and pulled off the airbox after unplugging the SAI connector and other airbox hoses.
Once I got the Airbox off, I took the SAI solenoid off and created a block-off plate out of aluminum as seen in this photo;
![]()
I then removed the 3 SAI hoses attached to the motor and found 3 plugs, generally used to cap off vacuum systems. I inserted each plug (closed end into the open valve) and then threaded in a stainless bolt to each as seen in this photo;
![]()
Next I moved to the 'California Model' carbon canister bolted under the injectors.
![]()
I just removed the two bolts, took off the entire bracket and unplugged all the connections. One problem I might need to fix later is that the tip-over hose on the fuel tank goes into that canister and branches off into a motor breather. If anything needs to be plugged in differently I'll post up later.
Anyway, I took another couple plugs and capped off the disconnected 3-way connection where it branched off to the CC and left the electrical connection on the CC valve solenoid connected. I just zip-tied it to a hose to keep it from swinging around. I might just wire up another resistor to that connection later too, but it works fine for now.
![]()
So, with all that finished, I put the airbox and tank back on and started up the bike. Voila! No check engine light, and strangely, the bike seemed to have a hair deeper growl and a smoother sound. Perhaps this is because the O2 sensor is now getting a TRUE reading without all that SAI BS? I let the engine warm up and gave it a rev all the way up to 9,000 RPM and NO BACKFIRING! Holy ***** thats a first for this bike! Normally, I'd rev it up to even just 6,000 RPM and it'd let off a moderate POP. Now its nothing, just clean revving and sounds great. I've got a lot more planned for this bike in the future, but thats all for now.
![]()
Exhibit A; the offending party.
I took off the tank, removed the two mounting screws which hold the airbox on and pulled off the airbox after unplugging the SAI connector and other airbox hoses.
Once I got the Airbox off, I took the SAI solenoid off and created a block-off plate out of aluminum as seen in this photo;
I then removed the 3 SAI hoses attached to the motor and found 3 plugs, generally used to cap off vacuum systems. I inserted each plug (closed end into the open valve) and then threaded in a stainless bolt to each as seen in this photo;
Next I moved to the 'California Model' carbon canister bolted under the injectors.
I just removed the two bolts, took off the entire bracket and unplugged all the connections. One problem I might need to fix later is that the tip-over hose on the fuel tank goes into that canister and branches off into a motor breather. If anything needs to be plugged in differently I'll post up later.
Anyway, I took another couple plugs and capped off the disconnected 3-way connection where it branched off to the CC and left the electrical connection on the CC valve solenoid connected. I just zip-tied it to a hose to keep it from swinging around. I might just wire up another resistor to that connection later too, but it works fine for now.
So, with all that finished, I put the airbox and tank back on and started up the bike. Voila! No check engine light, and strangely, the bike seemed to have a hair deeper growl and a smoother sound. Perhaps this is because the O2 sensor is now getting a TRUE reading without all that SAI BS? I let the engine warm up and gave it a rev all the way up to 9,000 RPM and NO BACKFIRING! Holy ***** thats a first for this bike! Normally, I'd rev it up to even just 6,000 RPM and it'd let off a moderate POP. Now its nothing, just clean revving and sounds great. I've got a lot more planned for this bike in the future, but thats all for now.
