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New ET4 Intake manifold issue
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tracer
UTC
Member
2005 ET4
Joined: UTC
Posts: 6
Location: New England
 
tracer
Member
2005 ET4
Joined: UTC
Posts: 6
Location: New England
UTC quote
I replaced the knockoff carb on my 2005 ET4 with an OEM Keihin, and took the opportunity to install a new intake manifold. I couldn't get vacuum to the petcock to get fuel to flow, so digging into the issue I found the brass fitting that connects the two vacuum lines was plugged with what appeared to be glue. A couple minutes with a dental pick to break through and some brass wire to ream out the orifice and I am good to go.

This was a new Piaggio part, purchased in December, 2025. So much for quality control!

Hope this helps somebody.
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@berto avatar
berto
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Ossessionato
2018 Liberty 150
Joined: UTC
Posts: 2097
Location: Toronto
 
berto
Ossessionato
@berto avatar
2018 Liberty 150
Joined: UTC
Posts: 2097
Location: Toronto
UTC quote
That's kind of weird

But good find and fix. Thanks for posting it here!
@oldfatguy avatar
Oldfatguy
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Hooked
Hurricane 200X, 2020 TW 200 (sold), 2022 Liberty 150
Joined: UTC
Posts: 312
Location: North Alabama
 
Oldfatguy
Hooked
@oldfatguy avatar
Hurricane 200X, 2020 TW 200 (sold), 2022 Liberty 150
Joined: UTC
Posts: 312
Location: North Alabama
UTC quote
tracer wrote:
I replaced the knockoff carb on my 2005 ET4 with an OEM Keihin, and took the opportunity to install a new intake manifold. I couldn't get vacuum to the petcock to get fuel to flow, so digging into the issue I found the brass fitting that connects the two vacuum lines was plugged with what appeared to be glue. A couple minutes with a dental pick to break through and some brass wire to ream out the orifice and I am good to go.

This was a new Piaggio part, purchased in December, 2025. So much for quality control!

Hope this helps somebody.
In Italy they do drink wine with lunch.

OFG
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