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 Non-Model Specific Technical Information
4-Stroke Jetting Tricks4-Stroke Jetting Tricks - Your four-stroke engine is basically an air pump and your carb meters how much air and fuel is sucked into that pump. Submitted by Chris

Baja Designs Dual Sport Lighting Kit SchematicBaja Designs Dual Sport Lighting Schematic Baja Designs Dual Sport Lighting Schematic (70KB GIF image) and Wiring Diagram Wiring Diagram (60KB GIF image). By Jeff Moon

Basic Dirt Bike OverhaulBasic Dirt Bike Overhaul - Do these things to your bike and you'll be happy all year long.  I charge pro racers big bucks for this service and they keep coming back! By New Old Stuff

California Motorcycle RequirementsAdobe Acrobat PDF file California Motorcycle Requirements (2.2MB PDF file) - California Highway Patrol official document listing complete motorcycle codes.

Carburetor JettingCarburetor Jetting - Carburetor jetting can be easily understood if we understand the basic principles of carburetor and engine operation. Magazine Reprint

Carburetor Overview (Keihin)Carburetor Overview (Keihin) - The carburetor on your bike should perform suitably with the standard recommended settings under average load, climatic, and barometric conditions. By 4Strokes.com

Conversion of Dirt Bikes for Street or Dual Sport UseConversion of Dirt Bikes for Street or Dual Sport Use (Topic in the Forums)

Dirt Bike Horsepower Calculator Dirt Bike Horsepower Calculator - Calculate the approximate HP of a dirt bike if you know the bike and rider weight and ¼ mile time.

Dirt Bike Tire SizingDirt Bike Tire Sizing - Most dirt bike tires have numbers that indicate the tire width, aspect ration (height) and rim diameter.

Do-It-Yourself Dual Sport / Supermotard HelmetDIY Dual Sport / Supermotard Helmet - Build your own Supermoto / Dual Sport helmet. By David Closs & The Morton's

Do-It-Yourself Dual Sport KitDo-It-Yourself Dual Sport Kit - I'm so glad I didn't buy a dual sport kit because I did everything myself for a fraction of the cost of a new kit. By Stu

Dual Sport Requirements Per StateDual Sport Requirements Per State Dual Sport Requirements Per State 6/07 - Minimum requirements for dual sport motorcycles in the US. 6/06 Version, 7/98 Version

Exhaust Header WrapExhaust Header Wrap - Keep exhaust temperatures confined. By Ygrumyz

Emergency Cable FixEmergency Cable Fix - A way to fix a cable if an end pulls off and you are miles away from civilization. By Randy Ressell
Fault Finding Flow Chart for Motorcycle Charging SystemsAdobe Acrobat PDF file Fault Finding Flow Chart for Motorcycle Charging Systems (88KB PDF file) - The most common fault in electrical systems is a bad connection. By Electrex USA

Fixing a Cracked or Broken CaseFixing a Cracked or Broken Case - The price of a new case can be horribly expensive and in most cases it can be fixed for a fraction of the cost. By Brian10

Fork Oil Adjustment - I drain the forks and then accurately set the initial oil level. Don't be afraid of this stuff! It is really quite simple! By Michael Hetrick

Dirt Bike Headlight Protectors/GuardsDirt Bike Headlight Protectors/Guards - Build your own very inexpensive headlight protector/guard for your dirt bike. By various individuals

Garage Door Opener for a Dual SportGarage Door Opener for a Dual Sport - I took our spare garage door opener, cracked it open, and found the spot on the circuit board to connect a button... By Jlutty650L

Gear Ratio ChartAdobe Acrobat PDF file Gear Ratio Chart (13KB PDF file) - Countershaft and rear sprocket gear ratios. By 4Strokes.com

Gearing CalculatorMS Excel File Gearing Calculator (42KB Excel file) - Calculate speeds (MPH & KPH) for primary and final (trans & sprockets) gearing, wheel size, and RPM. By Chris Helberg

Homemade Lower Fork Protectors - Make your own lower fork leg protectors. It's easy and costs less than a pack of smokes. They're made out of PVC pipe and snap right on. By New Old Stuff

How To Change (R&R) Tires - Are you have trouble changing your tires? This is how some folks from our forums remove and replace their own tires. By forum members

How to Read Your Spark PlugHow To Read Your Spark Plug - Here's how to check your jetting by reading the plug. Includes NGK part numbering PDF file. By 4Strokes.com

Adobe PDF file How To Set Up a Disc Type Exhaust System - Although intended for the Honda XR600R and XR650L with a WB E-series exhaust system, this PDF may help with the setup of other disc type exhaust systems. By WB

Make Your Own Frame GuardsMake Your Own Frame Guards - They are much cheaper than factory or aftermarket metal frame guards. By Anthony Loh

Measurement of Exhaust Sound Levels of MotorcyclesAdobe PDF file Measurement of Exhaust Sound Levels of Motorcycles (40KB PDF file) - This SAE Standard establishes the test procedure, environment, and instrumentation for determining sound levels of motorcycles. By SAE Mc Committee
Motorcycle Storage Procedures - Items of a motorcycle that should be addressed before putting it up for winter or long-term storage. By Robb Nelson

Painting Vinyl SeatsPainting Vinyl Seats - Are you tired of that old faded seat? Do you have a late 80's KLR with a color scheme designed by Kawasaki's watercraft department? By Dale Wagler

Plastic Restoration (via Painting)Plastic Restoration (via Painting) - It's no secret that dirt bike plastic fades and tanks yellow and lose decals as they age. After good advice, this is what I've found works well. By Edward Pinzel

Rear Fender BagRear Fender Bag - Here is an inexpensive rear fender bag for dirt bikes that do not have a rear luggage rack. By Jlutty650L

Registration Decal SaverRegistration Decal Saver - No more destroyed registration stickers when you remove your fork legs for service! (may or may not be legal) By 4Strokes.com

Rim Lock / Bead Lock / Bead Stopper InstallationRim Lock / Bead Lock / Bead Stopper Installation - If you switched from Dual Sport type tires to full knobbies, chances are you will need to install a rim lock. By 4Strokes.com

Seat Cover & Graphics InstallationSeat Cover & Graphics Installation - Sooner or later the graphics on your thumper are going to start looking ratty. By 4Strokes.com

Spring Preload, Race Sag & Suspension AdjustmentsSpring Preload, Race Sag & Suspension Adjustments - Setting the proper race sag is important for competition use. By 4Strokes.com

Testing for a Suspected CDI ProblemTesting for a Suspected CDI Problem - The first thing to do is to look at all the wires in the electrical system and make sure the insulation is not worn through... By qadsan

Thumper Starting ProcedureThumper Starting Procedure - If the engine is cold it may help to turn the idle screw up slightly to aid in warm-up and give the engine a little extra fuel. By 4Strokes.com

Tire Removal & InstallationTire Removal & Installation - 1. Lay the rear wheel sprocket side down and the front wheel brake side up. 2. Remove the valve core and loosen the rim locks. By 4Strokes.com

TopSpeed V2.1Zipped file TopSpeed V2.1 (151KB ZIP file) - TopSpeed Calculator by KAMware. Calculates for the following parameters: engine, gearing, exhaust, cam lobe center, and horsepower.

Understanding Your SuspensionUnderstanding Your Suspension - There are a few basic forces at work in suspensions that must be understood before making successful setting changes. By NOS

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