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- Advance Timing Key Installation. Cheetah takes us through exactly what is needed to install a Curtis Sparks advance timing key.

- 400ex Choke Removal. Removing the choke on your 400ex slightly increases the airflow.

- Two Stroke Explanation. Check out this guide to how a two stroke engine "ticks!"

- Spark Plug Color Chart. Check out this tutorial on reading your spark plug color to diagnose problems.

- Common 400ex Wheel Offsets. This guide will explain the most common wheel offsets found on 400ex's, and which is best for your application.

- Installing a pilot jet. Learn how to install a new pilot jet in your stock 400ex carb.

- D-I-Y valve adjustment. Is your 400EX in need of a vavle adjustment? Learn to do it yourself and save some $$!

- D-I-Y oil change. Tired of paying big $$ to get your oil changed? Learn to do it yourself!

- Ask Mickey Dunlap II. The second editon of Mickey's answers to your questions! More great reading be sure to check it out!

- Ask Mickey Dunlap I. The first edition of question and answer time with 4-stroke engine guru, Mickey Dunlap!

- Carb Jetting. Introduction to jetting your carb, we hope to take out some of the mystery in the sometimes frustrating task.

- 300EX Reverse Gear Mod. Simple directions on making your 300EX's reverse gear a bit easier to use.

- 400EX engine torque specifications. Torque specifications from the '99-'01 TRX400EX service manual.

- 400EX vin chart. Use this chart to decode your 400EX's vin number.