Honda K20A/K20Z/K24A/K24Z Lost Motion Spring 14820-PNA-013

Genuine Honda Lost Motion Spring (14820-PNA-013) - K20 & K24 DOHC i-VTEC

This is a part almost nobody thinks about until something starts ticking. The lost motion spring sits under the mid rocker arm in your K-series head, and its whole job is keeping that rocker pressed against the VTEC lobe while VTEC is disengaged. Without that pressure, the mid rocker doesn't follow the lobe cleanly, it floats and slaps, and you get valvetrain noise up top that drives you crazy trying to diagnose. This is the genuine Honda spring (14820-PNA-013) that puts the tension back where it belongs.

What A Tired Lost Motion Spring Actually Does

Here's the part worth understanding. When you're below the VTEC crossover, that middle rocker is riding the high-lift lobe but isn't doing any work, and the lost motion spring is what keeps it in contact instead of bouncing off. Over enough miles and heat cycles the spring loses tension, and once it does, the rocker starts chattering against the lobe. That's the tick a lot of K owners chase for weeks, blaming the injectors, the chain, or the valve lash, when it's actually a worn set of these. On a high-revving or built motor the stakes go up, because a weak spring means less control over a rocker that's getting whipped around a lot harder than Honda planned for.

Sold Individually, But Buy Eight

These are sold one at a time, which is handy if you're replacing a single one, but let's be practical. Your engine uses eight of them, and they've all lived the exact same life under the exact same heat. If one has gone soft, the other seven aren't far behind. Getting into the head is the expensive part of this job, not the springs, so replacing all eight while you're in there is the move. Order one if you genuinely just need one, but order eight if you want to fix the problem instead of postponing most of it.

Do It While The Head Is Apart

Getting at these means pulling the valve cover and the rocker assembly, so this is a job you want to knock out alongside other work rather than on its own. If you're already in there doing a valve adjustment, a head gasket, cam swap, or any valvetrain refresh, fresh lost motion springs are cheap insurance and they take almost no extra time once everything's open. Same goes if you're building a motor that's going to see real rpm. Start it with springs you trust rather than reusing whatever came out.

Why Genuine Honda Matters Here

This is a small spring living in a demanding spot, taking a beating every single revolution the engine turns. The tension spec has to be right or it doesn't do its job, and it has to hold that spec for years of heat cycling. This is the exact Honda part, so you know it's correct rather than hoping a generic equivalent holds up. Given how much work it takes to reach these, using the real part is the only version of this job that makes sense.

Fits Your K-Series

This spring fits DOHC i-VTEC K-series engines including the K20A2, K20Z1, K20Z3, K24A2, K24Z2, K24Z3, and K24Z7:

It also covers other applications running these engines, including swaps. Confirm the part against your engine's parts diagram before ordering.

Who Should Grab These Springs

This is for the K-series owner chasing a top-end tick, the builder freshening a head before it goes back together, or anyone with the valve cover off who'd rather replace a known wear item now than pull it all apart again later. It's a cheap part doing a job that matters, and it's worth doing with the genuine Honda piece. Grab eight, get them in while you're there, and quiet that valvetrain back down.

Fits: Honda K20A2, K20Z1, K20Z3, K24A2, K24Z2, K24Z3, and K24Z7 DOHC i-VTEC, across the models in the table above, plus swaps. Part number: 14820-PNA-013. Type: genuine Honda lost motion spring. Quantity: sold individually, eight required for a complete engine. Best done: with the valve cover and rocker assembly removed.