Looking for a Remap Service - Page 2 - Honda CRF1000L Africa Twin Forum
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post #11 of 14 (permalink) Old 08-24-2016, 01:35 PM
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Secondary Air Supply System

The secondary air supply system introduces filtered air into exhaust gases in the exhaust port. The secondary air is drawn into the exhaust port whenever there is negative pressure pulse in the exhaust system. This charged secondary air promotes burning of the unburned exhaust gases and changes a considerable amount of hydrocarbons and carbon monoxide into relatively harmless carbon dioxide and water.

I presume this is what cincinnati dave, means??

google search, I've no idea whether doing this is a good idea or not, luckily mine runs smoothly with no backfires, etc.

CZ 360, DT175, xt600, fzr600, r1100gs, r1150r, drz400, f800gs, r1200gs, r1200gsLC, CRF1000L
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post #12 of 14 (permalink) Old 05-04-2017, 06:05 PM
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Originally Posted by cincinnati dave View Post
For the popping and back fires Dakota morgan . IT drove me nuts as well . I plugged off the SAS system and it has improved greatly 90 percent of the popping and backfires are gone . It is however quite the pain in the arse to do this on this bike but possible none the less . this is the only mod I have done to my AT .
Please explain how to do it? Is just closing the air system or else? thanks
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post #13 of 14 (permalink) Old 06-09-2017, 08:55 PM
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Please explain how to do it? Is just closing the air system or else? thanks
also known as the AIS (air injection system). I haven't examined on the AT, but on most bikes a secondary air-hose travels from the air box to the a port on the head next to the exhaust valve side. Most of the time you can simply disconnect the hose and plug the port on the head... more expensive options of blocking off this port involve replacing the port with a "block off plate".

On a side note...plugging this port (or blocking it off with block off plates) is necessary when dyno-tuning with a Power commander. This is because the precise Air-fuel tinkering allowed by the power commander relies on having an accurate measurement air fuel ratio... and the AIS/SAS throws this air-fuel ratio measurement "off" but injecting fresh air into the exhaust stream.
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post #14 of 14 (permalink) Old 06-10-2017, 11:12 AM
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I will be leaving well alone. I quite like the odd pop on the overrun. Good luck and hope it works out.
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