Piaggio 844094 Engine Oil Breather Hose – Beverly, Vespa GTS, GTV, MP3, X7, Nexus

The Piaggio 844094 oil breather hose is the original hose that connects the engine breather to the air filter box. It's the escape route for oil vapors and blow-by gases that form in the crankcase when the engine is running: if the hose hardens, cracks, or kinks, the internal pressure can no longer escape, and the engine starts to leak oil from oil seals and gaskets, dirtying the air filter box, and, in the worst cases, spitting oil into the intake. It's a very inexpensive part that almost no one checks, but its failure can lead to much more costly repairs. The original Piaggio shape has pre-formed bends and correct diameters at both ends: when installed instead of a generic hose, it prevents kinks and disconnections.

✓ Strengths

• Original Piaggio spare part — house code 844094, official name "OIL BREATHER HOSE"
• Pre-formed bends and design diameters: it positions exactly like the original, without creases that restrict passage
• Extremely wide coverage — a single code for Piaggio, Vespa, Aprilia, Gilera, and Scarabeo from 125 to 300 cc
• Prevents oil leaks due to pressure that cannot vent from the crankcase
• Five-minute replacement — simply remove and reattach, without disassembling any engine parts
• The classic replacement to do while you're already there — minimal cost, huge return on engine sealing

Technical features

Vehicle compatibility

List taken from the official Piaggio spare parts catalog (B2B). Families are grouped with their covered production years.

Recommended products

The breather hose works with the air filter box and the air filter: if you found oily residues, also change the filter. If you're doing a complete service, in our catalog you'll find original Piaggio spare parts for all routine maintenance of your scooter — air filter, spark plug, high-tension cable, and engine gaskets.

Who is it perfect for?

• Those who found oil in the air filter box or oil stains on the engine and are looking for the cause
• Workshops that keep the most common consumable parts of the Piaggio range in stock
• Those who perform preventive maintenance on an older scooter: the hose hardens and cracks with heat, even without leaking
• Those who are putting a long-idle vehicle back on the road and want to replace all aged rubber components

Frequently Asked Questions

What is the Piaggio 844094 oil breather hose?
It is the original hose that carries oil vapors and blow-by gases from the engine breather to the air filter box, called "oil breather hose" in the Piaggio catalog. It serves to release the pressure that builds up in the crankcase during engine operation.

How do I know if it needs to be replaced?
Check it by hand: if it's hardened, cracked, crushed, or has cuts, it needs to be replaced. Indirect symptoms include oil leaks from oil seals and gaskets, oil stains on the engine, and oily residues accumulated inside the air filter box.

Can I use a generic rubber hose?
It's better not to. The original has pre-formed bends and correct diameters at both ends: a straight hose cut to size tends to bend, kink, or come off. Given how little the original spare part costs, it's not worth the risk.

Which scooters does it fit?
The official Piaggio catalog lists it for Beverly and BV, Carnaby, MP3, X7, X8, X9, and X10, Gilera Nexus and Runner 4T, Aprilia Atlantic, Sport City and SR MAX, Scarabeo with Piaggio engine, and on Vespa Granturismo, GT, GTS and GTV from 125 to 300 cc.

Oil is coming out of the hose: is changing it enough?
If only vapor comes out, that's normal. If liquid oil comes out in significant quantities, the hose is not the cause but a symptom: it means too much blow-by is reaching the crankcase, and the typical causes are worn piston rings or valve guides. In that case, a diagnosis of the engine is needed.