Archive for category Technical Documents'

Azusa: #219 Sprocket Data

When Azusa Engineering first began producing #219 sprockets, we found no published dimensional data tables with the precision we required for manufacturing. Using ANSI B29.1 Standard, Azusa derived the applicable formulas and generated the required #219 sprocket data. As a service to karting, we have summarized this hard-to-find data in the table below. Nominal Outside […]

Azusa: Chain Data

Roller Chain Number System Chain numbers used by ANSI (American National Standard Institute) are based on the number “8,” which represents one inch. Therefore, #80 chain has a 1″ pitch; #35 with a “3” as the first number, has a 3/8″ pitch; #40 with a “4” as the first number has a 1/2″ (4/8) pitch, […]

Azusa Engineering: History of #35 “Space” chain

Special #35 chain (as it was refered to then) first appeared in southern California late 1975 or early 1976 to solve the problem of oiling and dirt. I don№t have a record of who started selling it, but it must not have been selling fast enough. Acme Chain Company of Holyoke, Mass. asked Azusa Engineering […]

Bridgestone: Rim Width. Improving Steering Performance

Rim Width Rim Width Wider Narrower Grip Increase Decrease Handling Performance Increase Decrease Steering Response Quick Slow Lateral Stiffness Hard Soft Wet Performance Decrease Increase Rolling Resistance Increase Decrease Example of rim width adjustment: In the case of understeering: Make the front rim wider or rear rim narrower. In the case of oversteering: Make the […]

Bridgestone: Inflation Pressure. Vehicle Track Width

Inflation Pressure Pressure Higher Lower Grip Decrease Increase Contact Area Decrease Increase Steering Response Quick Slow Lateral Stiffness Hard Soft Traction Braking Decrease Increase Wet Performance Increase Decrease Wear A B (A) Center part of tread wears quickly   (B) Both sideparts of tread wear quickly In case slide speed is too fast (past grip limit […]

Bridgestone: Mounting Tires. Inflating Tires

Mounting Tires Safety Warning: Serious injury or death may result from an explosion of the tire/rim assembly due to the use of excessive pressure during mounting. Never exceed 35psi (240 KPA) to seat the beads. During tire inflation, always have assembly secured, atand clear, and use remote controlled clip-on air hose. Only specially trained persons […]

Bridgestone: Available Sizes & Specifications

Size Position Compound Pattern Measuring Rim Approved Rim Overall Diameter Overall Width Tread Width 4.5/10.0-5 F YEX/YFA/YFB DR7 4.5 4.0-5.0 10.4 5.2 4.3 5.5/10.0-5 F & R YFA/YFB DR7 6.0 5.5-6.5 11.2 6.5 4.7 6.0/10.0-5 R YEX/YFA/YFB DR7 6.0 5.5-6.5 11.1 6.7 5.2 6.5/10.0-5 R YFB DR1 7.5 7.0-8.0 10.8 8.1 5.4 7.1/10.0-5 R YEX/YFA/YFB […]

Bridgestone Application Chart

Specification Application Main Catagory to be used YEX Ultra-high grip compound; highest grip slick tire, well-suited for Sprint race use. Replaces YEL. Formula Super A, Formula A, Sprint YFA High grip compound; sprint race use, well suited for application where the track surface is smooth and temperature is low. CIK homologated tire. Replaces YEM. Intercontinental […]

Tecumseh vs. Briggs Raptor

The current mainstay of 4-cycle racing is the Briggs and Stratton 5HP engine. The Tecumseh Products Company is offering the racer engine choices. Tecumseh’s box stock 5HP engine currently does not have a national class in either IKF or WKA racing but the company is actively pursuing a place for its alternative to the Briggs […]

Brake Fluid Overview

“Enthusiasts for silicone based fluids tend to oversell it rather a bit.” “First, we need to distinguish between DOT-3/4/5 (a set of specifications) and silicone (a material on which some fluids are based). The DOT specs are based on the concept of wet and dry boiling points. the dry boiling point is applicable when fluid […]