2005 Road Star 1700 . If I keep my stock exhaust and air filter etc is there any reason I should remove the AIS?? will it change lean or rich runningor affect anything?

Update

Studied it furher and since the AIS injects fresh air into the exhaust port to burn unburned exhaust gasses.. it has nothing to do with air intake or fuel mixture settings. Just there to keep the EPA happy! I removed it entirely.<br><br>Post edited by: Pop Rivet, at: 2006/01/21 22:04

You should remove your AIS 'cause you bike will look better.

You do not need to change anything if you remove it.

Doc

Thats why I want to remove it. It easier to clean motor too!
Thanks

4: Backfires in Exhaust

Note:

It is normal for many high performance exhaust systems to moderately backfire or pop when the throttle is closed from mid-to-high rpm. In fact, one should expect a well-tuned high performance engine to &quot;pop&quot; and &quot;crackle&quot; when the throttle is closed at high rpm.

The popping is a result of the air/fuel mixture becoming very lean when the throttle is closed and the engine is rotating well above idle speed. It is also necessary that the exhaust system have rather open mufflers.

Why This (normally) Happens:

1) When the throttle valve is in the idle position, fuel does not flow out of the main system (needle, needle jet, main jet). Fuel is only delivered to the engine by the pilot (idle) system.
2) The combined effect of the closed throttle and elevated engine rpm is to create a fairly strong vacuum in the intake manifold. This vacuum, in turn, causes a high air flow rate through the small gap formed by the throttle valve and carburetor throat.
3) Under these conditions the pilot (idle) system cannot deliver enough fuel to create a normal, combustible air/fuel ratio. The mixture becomes too lean to burn reliably in the combustion chamber. It gets sent into the exhaust system unburned and collects there.
4) When the odd firing of the lean mixture does occur, it is sent, still burning, into the exhaust system where it sometimes ignites the raw mixture that has collected ---- the exhaust then pops or backfires.
5) Completely stock motorcycles do not do this until open-end mufflers are installed. The exhaust must be both free-flowing and have an open exit for the popping to occur.


Other possible causes:

Air Leaks:

Any source of fresh air into the exhaust system can create or worsen the conditions that bring about exhaust backfiring. The most common entry point is the junction of the header pipes and mufflers. Even a small air leak can dramatically increase the intensity or likelihood of exhaust system backfiring.

AIS is A source of fresh air injected into the exhaust ports.