2nd-Gen machine assume? They're critically important. Each throttle body generates vacuum and there are four independent throttle bodies.
The vacuum they generate is used to attenuate fuel-return by the fuel pressure regulator. Unplug the vacuum line and the pressure regulator won't return the fuel that it normally does at idle and part-throttle operation.
They also pull vacuum against the Intake Air Pressure sensor; used to calculate MAP for the fuel injection system.
Visit the hardware store and get three feet of vacuum line. Make sure they don't hand you washer fluid line, like they did me. Though it looks the same, it won't stand up to the heat of an engine bay; it'll collapse under vacuum. Washer fluid line may say "1 bar" or similar on the hose.
Photograph your assembly. Cut up the hose in sections that match the lengths in your original. Use those new sections to replace the degraded sections of your original.
My hoses visually looked fine. It was code 20 that led me into replacing them. More information here...
before i started it yesterday it said code 20,then it didnt do it again until i stopped for a couple hours to visit with some people,now today i tun the key on and here we are again,its my 2008 with 10,000 on the clock,i dont get it,i bought a new bike so i wouldnt have this shit happening,any...
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