Honda Generator EU20 Covers Seal Kit
A$39.00
Honda Generator EU20 Covers Seal Kit comprises of the below seals
Air Cover Seal A - 17233-Z07-000 F-14 Part 6
Maintenance Cover Seal A - 63153-Z07-000 F-23 Part 2
Maintenance Cover Seal B - 63154-Z07-000 F-23 Part 3
Spark Plug Cover - 63344-Z07-000 F-23 Part 9
Side Cover Seal A - 63218-Z07-000 x 2 F-23 Part 5
Front Cover Seal - 63512-Z07-000 x 2 F-23 Part 12
The Honda EU20i is the legendary predecessor to the EU22i, and while it's famously "bulletproof," its cooling and noise-reduction systems are arguably more sensitive to seal condition than the newer models.
Because the EU20i uses a slightly smaller GX100 engine and an older ducting layout, maintaining the Maintenance Cover Seal (Part #63154-Z07-000) and internal gaskets is vital for several reasons:
1. Airflow "Short-Circuiting"
The EU20i relies on a very specific internal pressure balance.
The Problem: On the EU20i, the cooling air is pulled in and directed through a tight internal shroud. If the rubber seal on the side maintenance door is perished or missing, the fan will pull "easy" air through that gap instead of drawing it across the inverter and cylinder head.
The Result: You won’t notice a problem at first, but under a heavy load on a hot day, the inverter module (the "brain" of the EU20i) can bake itself. Unlike the engine, which might just seize, an overheated inverter usually results in a "no output" fault that is very expensive to repair.
2. Preventing the "Honda Rattle"
One of the most common complaints with older EU20i units is a phantom rattling sound.
Hardened Seals: Over years of heat cycles, the original rubber seals can turn from soft and pliable to hard and plastic-like. Once they harden, they no longer dampen the natural frequency of the engine.
The Fix: Replacing a $10–$15 seal can often make a 10-year-old EU20i sound brand new again by stopping the plastic-on-plastic vibration between the main housing and the access panel.
3. Protection of the Control Panel
The EU20i panel isn't as well-sealed as the newer EU22i.
The Front Cover Gap: There is a seal where the front control panel meets the side housings. If this is compromised, moisture and dust can get behind the panel.
Corrosion: This leads to "green death" on the back of the outlets and the Eco-Throttle switch. Keeping the outer housing seals tight ensures that the "internals" stay dry even if the unit is sitting in damp grass or light mist.
4. EU20i Specific Checklist:
The Bottom "Under-Cover": Check the rubber feet and the seals on the very bottom plate. The EU20i pulls some air from the bottom; if these are missing, it can suck up loose dirt or sand directly into the cooling fan.
The Fuel Filler Neck Seal: Ensure the rubber boot around the fuel neck is intact. If it’s split, spilled fuel can leak inside the casing and degrade the foam sound-deadening material, which then crumbles and clogs your air intake.
Oil Filler Seal: The EU20i has a smaller oil fill area than the EU22i. If the seal on the maintenance door is bad, any small oil weeping from a loose cap will attract dust, creating a thick "sludge" inside the cooling ducts that is a nightmare to clean.
Pro Tip: If you're servicing an EU20i, don't just check the spark plug. Take 30 seconds to wipe down the rubber seals with a bit of silicone spray. It prevents them from sticking to the plastic case and keeps them supple enough to maintain that "whisper quiet" Honda seal.