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Originally Posted by JFMNINJA400
Does the 400 rear shock fit the 250 and is it better than the 250 shock. Will it fit without modification? I have one sitting in my basement from my 400 with just 2500 miles.
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I haven’t checked part#, but 400 shock looks same as new-gen 250. Measure spring wire-diameter to compare. Since 400 is ~15lbs lighter than 250, same shock would feel stiffer on 400.
Although rider weight makes bigger difference. Select GSX-R shock with spring-rate you need for your weight. Having adjustable damping allows for fine-tuning that’s not possible with any factory shock. Factory dog-bones can be re-used. Some spacers are needed to widen their spacing to clear larger springs on GSX-R shock.
Here’s
preload adjuster for SpicyCactus. They allow you to set ride-height/sag of suspension so it operates in optimum middle range. Won’t bottom out on bumps or extend fully on rebound. As new rider, I recommend not focusing or spending too much on hardware upgrades. Spend it on track-time and classes as that’s where you’ll make biggest improvements.