4Strokes.com Honda Technical Information

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Honda Four-Stroke Technical Information

10 Tips for the XR600R from Scott Summers - Here's what Scott Summers and Fred Bramblett do to their XR600R's to make them more competitive in competition.

93-00 Honda XR650L Aesthetic Changes (Forums). By xr250rguy

A Cooling Fan For Your XR650R (178KB PDF) - An example of how to add a computer style fan to your XR650R. By Andy Waddell

Updates: A bracket drawing by Jim Rowley. Here's a cooling fan for the XL600R.

Airbox Mod (XR650R) - A very popular air-box modification for the XR650R. By qadsan

Carburetor Adjustments & Tuning (XR400R/Keihin 36mm) - As delivered, with an exhaust diffuser installed and a noise suppressor in the air box, your bike may be jetted rich for your riding needs. By 4Strokes.com

Cheap XR100R Mods - After reading through your website I decided I would volunteer the mods I did on my 6 year old sons 2000 XR100R. The cost of this project was about $10.00 and that was just for new jetting. By Greg Kipp

Clarke 4.7 Gallon Gas Tank Stabilizer - An easy 30-minute job, and the tank will be rock solid afterwards. By forum members

How to fit a CRF450R/X clutch/hot start perch to an XR400R - By Brad Poulter

2005 CRF450X Wiring Diagram (60K GIF image)

Dave's XR650L Mods (forum Post) - XR650L mods by Dave Closs.

Decompression System Adjustment - An automatic decompression system is interlocked with the cam to make starting easier. By 4Strokes.com

Do-It-Yourself Smog Block-Off for the XR650L - I just purchased a 2003 Honda XR650L and so begins the uncorking process. By Kyle Swanson

Exhaust Noise Test Data (101KB PDF file) - This PDF file contains exhaust noise level (dB) ratings for different model Honda dirt bikes with various aftermarket exhaust systems. Please go to the California State Parks Off-Highway Motor Vehicle Recreation Division Website for the latest edition. By John Franger

Honda Mini 4-Stroke (to 110cc) Powertrain & Drivetrain Related Specs - By Forums members

Gordon Mods (XR400R) - After carefully examining the stock baffle, and running some flow numbers for the different areas involved... By Gordon Banks

Honda Wiring Color Key (Forums)

Honda VIN Codes, Reading (Forums)

How To Set Up a Disc Type Exhaust System - Intended for 85-87 & 91-98 XR600R and 93-98 XR650L with a WB E-series exhaust system. May be helpful for other models with disc type exhaust systems. By White Bros

Installing Lights on the XR200R - Shed some light on your XR200R with this article. By 4Strokes.com

Intake Air-Box Snorkel Removal - Uncork your XR for some new-found power! By 4Strokes.com

Joe's XR400R Hop-Ups! - I've owned my XR400R for nearly four years now, and still after all this time I am not ready to part with it just yet. By Joe Sexton

Lever Pivot Bolt & Boot - A clean mod when you remove stock hand guards and replace with bar mounted style. By 4Strokes.com

Measurement of Exhaust Sound Levels (40KB PDF file) - This SAE Standard establishes the test procedure, environment and instrumentation for determining the sound levels. By SAE Mc Committee

Modifying the XR250L - So you just bought a new XR250L. Have you noticed how heavy it is? Have you noticed that it doesn't have much punch? By Rick Ramsey

Pics of XR400R Engine Work - This pic was taken after porting the head. By ThumperTDC

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

Setting Valves on the XR600R - Adjust the valves on the compression stroke. By Craig Cullen

Speed vs RPM Calculator for the XR400R (31KB Excel file) - This Excel spreadsheet calculates speed vs RPM for various tire and sprocket changes on XR400's only. By Bob Bendt

Stuart's XR200 Hop-Up's! - I bought an XR200 new in 83 as a 2nd play bike. This was the last good year before the weird engine in 84-85. By Stuart Watson

Uncorking the Honda XR650R - Modifying or uncorking the XR650R BRP for higher performance using all factory parts (per Honda Tech Bulletin).

Uncorking the Honda XR650R BRP By Bob Naumann

Uncorking the Honda XR650R BRP (Bob Naumann) - This is how Bob uncorked his 2000 Honda XR650R Big Red Pig (BRP).

Wally's XR200R Hop-Ups! - "The most impressive mod was adapting the KX front end." By Wally King

XR200R Front Suspension Mod - Here's what I did to get the best front suspension I've ever had with dampening-rod type forks. By NOS

XR200R / XR250R (1984) Wiring Diagram - By Jared (Jayrod1318)

XR200R / XR250R (1984-1985 & On) CDI Wiring Color Code - By Jared (Jayrod1318)

XR200R / XR250R (1984-1985 & On) CDI Testing Table - By Jared (Jayrod1318)

Tips & Tricks For The XR250R/L - This articles is based on an Australian model 1997 XR250R/L but can be beneficial for other bikes. By Daniel Stebbeings

XR250R Exhaust Mod - Use a screwdriver wedged in the hole in the stainless cover where the Torx screw was. By Stuart Moss

XR250R Lowering Link, Make Your Own - XR250R lowering link dimensions. Forums post by Stu

XR250L ('91-'96) Wiring Diagram - Pg 1 (57KB GIF), Pg 2 (46KB GIF) - Submitted by Ian (marshman)

XR400R Brake Light - Mod to add a brake light to the Honda XR400R.

XR400R Engine Oil Checking & Changing - (Manual republish) Probably the most requested info.

XR400R Fork Valve-Stack Compression Mod (Forums) - High-speed compression (riding over rocks) was much improved... By Trailryder42

XR400R Mods / Setup (Early XR400R Mod Database) - This modification and setup information is related to the 1996, 1997 and 1998 Honda XR400R.

XR400R Muffler Comparison - A chart showing HP and Torque figures on stock and popular aftermarket mufflers for the Honda XR400R. By Jack Jensen

XR400R Passenger Pegs - Adapting XR650L passenger pegs to the XR400R. By Robb

XR400R Stator Upgrade - I opted for a new 200w unit. I wanted more power because I was installing dual headlights, and possibly other accessories in the future. By Robb

XR400R Wiring Diagram - 96-04 XR400R electrical wiring diagram / schematic.

XR500R Replacement CDI (Forum Post) - Rewire a '93-'00 XR600R CDI to use in mid 80's XR500R. By Greasser

XR600R Dual Sport Project Bike - I've been wanting to make a custom dual-sport bike for years. By Tom Niemela

XR600R (88-90) Wiring Diagram (66K GIF image)

XR600R (91-93) Wiring Diagram (70K GIF Image)

XR650L (Dave's) Carb Mods - Mods for the 42.5mm diaphragm-type CV Keihin carb. By Dave Closs & Brian Jackson

XR650L Electrical Relocation Mod - First off, I took off the whole rubber box thing where it was all housed. I trashed the bracket and built a different one... By Ryan

XR650L Oil Cooler - Stock XR400R oil cooler installed on an XR650L. By helrich (of the forums)

XR650L Simplified Schematic for Safeties - By Dave Closs

XR650L Smog Block-Off Procedure With Pics (Forums) - By Mike Tuttle (XRnTahoe/KingTutt)

XR650L (non-California model) Smog Removal (Forums) - By ALS650L

XR650L Smog Removal - How to remove the smog system on an XR650L. By Gary Crawford

XR650L Windshield - I modified a $25 auction site KLR smoked windshield to my XR650L. By Jlutty650L

XR650L (93) Wiring Diagram (73K GIF image)

XR650L (93-95) Wiring Diagram (123KB GIF image) - Submitted by Tim Hixson

XR650R Race Prep Tips - 1. Check right side foot peg bolts on a regular basis. 2. The air filter is held in place by the left side panel. Be sure the front lower clip has adequate tension. By a guest

XR650R Stator Rewind - You've installed a mega watt, quadruple beam, uranium isotope, halogen hybrid headlight, only to find that the BRP is seriously lacking in the electron pumping department. By Eric Foster

XR/XL Spring Rates per Rider's Weight - Is your Honda XR/XL fork and shock sprung correctly per your weight?

Honda Tech Categories: Tech Info | Tips | Links