‘16 YZ450F onto ‘18 YZ250 2-stroke Suspension Swap

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4/23/2018 6:04 AM

One of my best riding friends just got his hands on a new 2018 Yamaha 250 two stroke and absolutely loves it. In fact he’s thinking about ditching his 450 entirely. However, he’s attempting to qualify for open pro sport at Loretta’s and is likewise only a couple of pro-am’s away from getting his pro card. While he’s doing great with the stock suspension on the bike, he’s tight on money and he’d love to have the suspension from his 2016 YZ450F that’s been revalved on his ’18 two stroke. I’m fairly sure the forks are compatible, but is it possibly to swap the rear shock assembly?

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4/23/2018 6:32 AM

Might just need differnt clamps for the forks. Think the 450 is bigger. Pretty sure 250f and the 250 share the same forks. The shock is going to be difficult with out modifacation because the Reservoir is on the left side instead of the right.

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4/23/2018 8:22 AM

It does not make any sense to do this. The valving for rider X on a 450 is going to be different than the valving that rider X would get for the yz250 2 strokes. The bikes have completely different weights, the rebound in the shock is likely quite a bit different due to the torque of the 450 ect. Somebody like slip dog i believe could give more reasons why but even if you could shoe horn it to fit (which I doubt you could with the res on the seperate side, you're going to be into a revalve cost). Cheaper to just pull off the current stock stuff and have it revalved. If he's that fast somebody local should be willing to do it for him for the price of some shims and fork oil.

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4/23/2018 8:27 AM

dmm698 wrote:

It does not make any sense to do this. The valving for rider X on a 450 is going to be different than the valving that rider X ...more

Was thinking this same thing.

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2017 RMZ450
2005 YZ250-sold :,(
1998 YZ250
2005 KX250F

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