Valving and shim stacks are probably the least understood topic in the dirt bike community, not only because it's a complex and subjective topic by itself, but because there's little information available... Not anymore!

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If you can, take a look at these Offroad Engineered episodes first:
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Ep.2 -    • How cartridge front forks work | Offr...  
Ep.3 -    • The difference between Open & Closed ...  
Ep.4 -    • How a dirt bike Shock Works | Offroad...  

0:00 Intro
0:27 The birth of shim stacks & valves
1:10 Anatomy of shim stack valves
2:05 How tapered single-stage shim stacks work
3:00 How tapered double-stage shim stacks work
4:08 Changing the ports
5:04 Changing the shims
7:00 How it affects the damping curve
10:32 Tuning experience
11:12 End

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Cheers!
#Tuning #ShimStacks #Valving