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Stock Airbox Mod
Cost: $0
Difficulty: 3 of 5
Tools Required: Hack saw, Phillips head screwdriver, pliers.
Is Mod Reversible?: No
The stock air box has a puny 1” opening through its snorkel. This opening is responsible for supplying all the air for the your 50 (it’s like breathing through a straw). For this mod, we’re going to open up your intake and eliminate 70% of all the unnecessary restrictions. The easier your bike can breathe, the more power it will generate. Remember that "intake" is only part of the equation; you must also open up the exhaust. Please see Exhaust Mod.
Step 1:

Remove the stock air box assembly by loosening the single Phillips head screw, then temporarily detach the crankcase breather hose. The entire unit should slide completely off the carburetor. It should look like this on your work bench.

Mini Bike
 
 
 
 
Step 2:
Split the air box by removing two Phillips head screws
XR50
The air box should split in two. In the next page, we will dive into how to remove the backfire plate and screen.
CRF50
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