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Engine Tech

2 Stroke Technology

 1.0  2 Cycle Technology Engine Animation
The eBook is 44 pages with the following content:
   1.1 Introduction
   1.2 Overview
   1.3 Horsepower & Torque
   1.4 Dynamometers
  2.0 Port Design
   2.1 Taking Measurements
     2.1.1 Distance Measurements
     2.1.2 Distance to Crank Angle Degree Conversion
       2.1.2.1 Distance to Degrees Calculator Workbook
     2.1.3 Port Mapping
     2.1.4 Wall Angle and Roof Measurement
     2.1.5 Port Opening and Timing Measurement
   2.2 Port Timing Elements
     2.2.1 Typical Port Timing and RPM
   2.3 Systemic Review of Port Timing
  3.0 Introduction to Pipes
   3.1 Pipe Components
   3.2 Effects of Cone Wall Angles on Sonic Waves
   3.3 Effects of simple changes on Pipes
   3.4 Event Simulation using the Event Calculator Tool
     3.4.1 Engine Simulator Workbook

Download eBook as Flashpaper or PDF

CR125 03 Spec Blueprint and Tuner’s Guide

1) Introduction
2) Top End Specifications and Assembly
3) Clutch Assembly
4) Bottom End/Gearbox Assembly & Troubleshooting
5) Crankshaft Specifications & Preparations
6) Crankcase Specifications & Assembly
7) Performance Modification Overview
8) Pipes - RCE T3, RLV B4, RCE T5
9) Cylinder Porting
10) Cylinder - Detonation Rings & Other Mods
11) Piston - RS, Wiseco, Dome and Flat Top
12) Head - O-Ring, Squish, Compression
13) Reedcages - what works, what doesn't
14) Carbs - Facts & differences among brands/models
15) Pumparound Conversion - How to
16) Detonation - running on the edge of destruction
17) Reed Tuning - Stiffness selection
18) Fuel/Oil
19) Tuning the Carb - Performance, Color & EGT
20) Relative Air Density Calculator for Carb Tuning


 

 

Dyno Sheets
1. 2002  
2. 2003
3. 2004
4. 2005 (Spec 05)
5. Stock Moto

 
CR125 05 Spec Updates

Covers:

1) Introduction
2) 05 Spec Overview & Dyno Sheets
3) RLV R4/R5 Pipe & Silencer
4) Cylinder Porting Update
5) Piston Update
6) Head Squish Compression Update
7) Carb and Billet Manifold Update
8) Ignition Update
 

 
Fuel & Oil

1. Oil and Ratio
     1.1. Castor Oil
     1.2. Synthetic Oil
2. Gasoline & 2 Stroke Engines
   2.1  Volatility
   2.2 Heat of Vaporization
   2.3 Octane and Rate of Propagation
   2.4 Energy Content
   2.5 Oxygenation
   2.6 Purity and Cost
   2.7 Fuel Tech
   2.8 Fuel Storage and Care
   2.9 Applications – What fuel works best for your Kart?
     2.9.1. Piston Port Air Cooled
     2.9.2. Rotax/TAG
     2.9.3. ICC/ICA
     2.9.4. Stock Moto
     2.9.5. Open/Mod Motos
 

Castor Oil
1. Castor Oil

Ignition

1) Curve Analysis Document
2) Dynatek Program Software Download - See Notes

Notes:

  1. The Dynatek Program Zip file contains the Dynatek Programming Software ( '1999CR125.JAR'), the Dynatek Instruction Sheet, and 3 subfolders with 4 curves each.
  2. You will also need a JAVA Virtual Machine to run the JAR file. You may already have one, if not Google 'JAVA Virtual Machine', download and install it.

Files in a folder Labeled 'Spec05' under the Dynatek folder are matched to the Spec05 Engine:
Dynatek Spec05 Curve 1 Download
Dynatek Spec05 Curve 2 Download
Dynatek Spec05 Curve 3 Download
Dynatek Spec05 Curve 4 Download

Files in a folder Labeled 'Spec03' under the Dynatek folder are matched to RCE T3 engines:
Dynatek Spec03 Curve 1 Download
Dynatek Spec03 Curve 2 Download
Dynatek Spec03 Curve 3 Download
Dynatek Spec03 Curve 4 Download

Files in a folder Labeled 'SPI' under the Dynatek folder are matched to RLV B4 (2002 vintage Swedetech):
Dynatek SPI Curve 1 Download
Dynatek SPI Curve 2 Download
Dynatek SPI Curve 3 Download
Dynatek SPI Curve 4 Download

 

1999 Honda CR125 Parts List
 
General Interest

4 Stroke Shifter Stuff
Rotary Wankel Kart Engines
Is Electric Drive Next?
Cylinder & Head
Crankcase
Right Side Cover
Left Side Cover
Clutch
Gearbox
Drum/Shift
Crankshaft & Piston
Water Pump
Gasket Set

Complete printable Bill of Materials for the CR125 Kit Engine

Clutch Sprocket and Chain GearMaster –CR125 Gear Ratio Spreadsheet