Lindemann Engineering Invitational

Minibike Endurance Racing

Overview

A minibike endurance race series consisting of twin six-hour races.  Saturday & Sunday at a Kart Track.  Saturday and Sunday’s race will be run is opposite directions.  Results for each race and overall.  BYOT, bring your own trophy.  No corner workers, no ambulance, no officials, we race on the honor system.  We race rain or shine.  In order to keep our speed appropriate for kart tracks a Yamaha TTR 125 with a stock exhaust system running on pump gas will be the standard race bike.  Other similar race bikes that are faster than the standard must be de-tuned or limited in some way to match the standard bike speed.  Teams must apply for an invitation to participate.

Team Qualifications

Riders who: understand that it’s the responsibility of the overtaking rider to make a clean pass, demonstrate maturity in the paddock by riding slowly in first gear, raise their arm before slowing down or changing their line on track for any reason and actually read the rulebook, may form a team and apply for an invitation.  All riders must have personal medical insurance.  Minimum rider age is 18 years.

Bikes and Modifications

Bikes including the Yamaha TTR125, YSR50, Honda XR 100, NSR50, 125 Grom, Kawasaki Z125 and similar are allowed.  Other than a stock exhaust system so the bikes are quite, unlimited modifications are allowed.  Any tires.  Pump gas without additives other than premix oil for two-strokes.  Bikes that are faster than the standard bike must be restricted.  If a race bike appears to be too fast, a 3rd gear roll-on test will be performed against the Standard Bike using riders of similar weight.  Race bikes that pass the test but turn out to be too fast during the race will be assessed one billion penalty laps.  Electric motorcycles in this speed class will be given bonus laps to make up for their extra pit stops to change batteries.

The Standard Race Bike is a 2017 Yamaha TTR125LE.  A mostly stock bike with stock carb, air box and exhaust.

Bike Preparation

Race bikes must be clean, they must be built and maintained in a work-man like manner.

Safety wire:  Fluid caps, drains and filters must be wired.

Crankcase breather:  Must connect to the stock airbox or an appropriate catch tank.

Numbers:  Must be legible.

Night races:  Starting at dusk a steady red tail light must be clearly visible.

Standard rules:  Working front and rear brakes, balls on the end of clutch and brake levers, water in the cooling system, etcetera are implied.

Riding gear

Standard road racing gear is required.  Personal medical insurance is required.

Inspection and Penalties

During the race, teams and riders are responsible for tech inspecting their own race bike, if the bike breaks or is damaged it must immediately be repaired and reinspected.  If a team bends or breaks a technical rule or the spirit of the sport that team will self-impose a five or 10 second penalty at the end of a pitstop.  No work may be performed during the penalty phase.  If a rider bends or breaks a riding rule or the spirit of the sport that rider will self-impose a long lap penalty.

Pit Stops and Behavior

Hot pit speed is limited to first gear.  Refueling during a race requires the engine to be off, the rider to be dismounted, the bike to be on its side stand or another stand, the fueling person and fire extinguisher person wearing covered shoes, long pants, long sleeves, gloves and eye protection.  Race refueling may not be performed under a flammable structure.  Fire extinguishers that are not in use shall be located away from the fuel supply, easily accessible and obvious to all.

Grid Procedure

As the start is not particularly important for an endurance race, the starting riders will line themselves up on the grid based on their relative speed with fast starting riders at the front and slower starting riders to the rear.  Restarts will use the same griding procedure.  The goal is to have the faster starting riders in front with the slower riders behind to manage the first lap risk.  Scoring will be by transponder system with no manual backup.

Race Control

Teams are expected to be low maintenance.  The race director will keep an overview of the track and hot pit.  The director will red flag a race if necessary.  Riders will treat any crash as a temporary waving yellow.  The crashed rider will move away from a crash zone, self tech, rejoin in a safe manner and continue racing.  Teams may pit and work on their bikes during a red flag.

Summary

The primary purpose of this organization is to facilitate enjoyable race battles on track.  Imagine two or more riders racing close while giving each other just enough room, about to lap someone. These riders’ checkup just a little so they pass the slower rider without drama, then continue their battle.  If one rider makes a mistake and cuts the course or gains an advantage through some means other than skill, he or she makes an adjustment to give back those ill-gotten gains.

Applications

Application is by email to ed@le-suspension.com

Applications shall include a Team Captain, list of riders and photos of the race bike and practice bikes.  All riders must be 18 years of age or older.  Please include designated team captains phone number for an interview.  Minimum of two riders per team.

Maximum of 20 teams.

Bench racing will not be limited, bragging rights will be assigned for creative team names.  All team names must be approved.

Race Schedule

Sat & Sun:  8am Tech, 8:30 Rider Meeting, 9-10:30 Practice, 11am to 5pm 6 Hour Race.

Teams may race the full 6 hours or any part there-of and they may enter one or both days.

Fees

Race entry: $200 per rider.  

Rent a race prepared TTR125:  $300 for a L and $400 for a LE + crash damage.  Includes tires.  You supply 91 Oct pump gas, about 5 gallons per day.

Second Event Track

Willow Springs Kart Track, full course.  Counter clockwise, left on Sat and clockwise, right on Sunday.  Hot pit will be under the covered pit area.  Two events in 2024, first race about March.  Stay tuned!

 Last update 10/9/23.