Air Injection system is common in many bikes today.
The system is quite simple, a pump suck air from airbox and send to exhaust valve.
The pump works with a membrane ritmic suction from a carburetor hose.
The pump looks like this:
[image]http://img.alibaba.com/photo/50596468/Second_Air_Injection_System.jpg[/image]
AI pump Lot of people spend money to buy AI remove systems but sometimes this system is useful.
Maybe I find useful in the winter where it permits a faster warm up of the bike.
It's useful in that country where laws oblige to periodical EPA exhaust controls (eg. in Italy after 4 years first time and every 2 years after).
On my bikes insted of removing this system I applied a small spigot or mini ball valve used for air compressed systems.
A valve like this:
[image]http://image.bizrate.co.uk/resize?sq=400&uid=494025466&mid=105838[/image]
Mini ball valve So I cut the pipe between airbox and air pump and apply this with two screew collars.
I can open and close the valve whenever I need, and I can also partialize, causing only a smaller amount of air go in the exhaust.
There's no consequencies for the pump, only it doesn't suck anything if the valve is closed.
