Hello everyone.
Today I'm sharing what I found out about the front fork springs in the Honda XR series (the Japan-market XR250 and XR250 BAJA / MD30).
When I took my front forks apart, I found that the XR series fork springs differ by model year.
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Honda XR250, BAJA, & XR250R Fork Springs: Real-World Measurements Reveal the "Model-Year Trap"
In this article, we’ll be pulling the front fork springs from three of Honda’s iconic dual-sport and off-road machines—the XR250 (MD30), the XR BAJA, and the competition-only XR250R (ME08)—to perform a thorough side-by-side comparison of their specs, free length, and internal structures. We’ll also dive deep into the "model-year trap" hidden within the factory service manuals regarding subtle spec changes over the years. Hey everyone! Today, we’re doing a deep dive into the suspension setup of the Honda XR series, a lineup that still commands a massive cult following among off-road enthusiasts. Right now, I have three different sets of ...
So this time, I looked up the differences in fork spring length in the service manuals.
To compare springs properly, you'd need to check not just the length but also the wire diameter and number of coils.
But with so many parts now discontinued, I can't get hold of springs from every model year to check, so this is a comparison of length only.
Straight to the results.
I put them in a chart so you can picture the actual fork springs and fork oil.
From this, I came up with the following guesses.
| What I found | What I think |
| The early XR250 and BAJA use the same springs | Even though the BAJA should be more front-heavy?? |
| The XR250 V and Y models have the same settings | Did Honda think this was the best setting for the XR250's conventional forks? |
| Apart from the BAJA T model, total spring length is 435.9 to 436 mm | To cut costs by sharing every part except the springs? |
| The BAJA T model's total length is about 3 mm longer than the others (439.2 mm) (A mistake in the service manual?) | To add preload, as it's the model with the 14 L tank? (Are parts other than the springs different too??) |
| The BAJA uses the same springs from the V model to the 3 model | For the BAJA, did Honda think this was the best setting, and plan to fine-tune with the fork oil? Did they adjust the oil because changing the springs costs more? |
| The BAJA 3 model's fuel tank holds 500 cc more, yet its springs and oil volume are the same as the Y model | Did they think 500 cc of fuel wouldn't matter? The extra 500 cc only lasts for about the first 10 to 20 km after filling up, so did they ignore it? |
| From the V to the Y model, a secondary air supply system (AI: Air Injection) was added, putting on 1 kg, but the springs didn't change. | Did they decide that much extra weight didn't need a setting change? |
Having got this far, I started wondering, "Maybe the parts inside the forks other than the springs are different between the XR250 and BAJA too..."
I'll look into that some other time when I have the chance.
I've also written a guide to overhauling the XR250 / BAJA front forks, from disassembly to oil, springs and re-plating, with the steps and costs.
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Honda XR250 / BAJA Front Fork Overhaul Guide: Steps, Costs and Model-Year Differences
A summary of my XR250 BAJA (MD30) front fork overhaul: the order of the work, re-plating costs, spring differences between the XR250, BAJA and XR250R, mixing fork oil to match Honda's viscosity, and axle thread sizes by year.
