Archive for category Technical Documents'

Axle clutch maintenance

If you run a Horstman axle clutch, one of the most popular types of axle clutch in enduro racing, you should go through the clutch periodically. The manufacturer recommends that you check the oil level every race, and add oil if necessary. Horstman also recommends checking all the aluminum bolts – through which you reach […]

Rebuilding the L & T clutch

Perhaps the hottest product to find its way onto the starting grids at kart tracks around the country is the L&T clutch. This clutch seems to have solved more performance problems than any other part recently introduced. Although this clutch is just starting to make a name for itself in the karting world, little is […]

Front Geometry

Effect of geometry on jacking effect (or height change) and camber. Lead is spindle axis position, fore and aft of the kingpin axis, in inches. JEF is the spindle jacking effect 130mm out from the kingpin when the spindle is turned 20 degrees forward. JER is the spindle jacking effect 130mm out from the kingpin […]

CIK Homologated Tires

These are the CIK homologated tires for the three years commencing in 1996 All tyres ———– Pneus K Ka 10 x 3.60-5 Pneus K Ka 10 x 4.50-5 Pneus K Ka 11 x 6.00-5 Pneus K Ka 11 x 7.10-5 Pneus K Kz 10 x 3.60-5 Pneus K Kz 11 x 6.00-5 Cheng-Shin —————- Maxxis […]

Dirt track chassis setup

CONDITION/STAGGER/ FRONT WHEELBASE/ REAR WHEELBASE/TIRE WIDTH/ TIRE PSI/ GEAR MUDDY / 1/4″ / WIDE / WIDE / WIDE 7″ / 12 TO 16/ MORE TACKY / 1/8″ / RT FR IN & / LF REAR IN / MEDIUM /12 TO 14 FR/MED / / LF FR OUT / RT REAR OUT / 6.5″ /12 TO […]

JICA Piston Port Specs

Intercontinental A Junior Piston Port Engines, 1995 Homologation Intake Exhaust ——————- ————————- Engine Bore Stroke Degs Inches Width Degs Inches Width Web ———– —— —— —– —— —– —– —— —— —- Comer P50 1.9685 1.9882 160.43 .949 1.379 172.4 1.297 1.537 .157 Comer B52 1.9385 2.0472 159.13 .969 1.358 171.2 1.347 1.516 .157 CRG […]

How to weigh your kart

Getting a kart to handle is all about getting the tires to behave the way you want them to, and one of the main ways to do that is through controlling the load changes they undergo in cornering. Driving technique certainly influences dynamic tire loading, and chassis setup determines what the driver has to contend […]

How Does Your Kart Look Now?

As we racing competitors get the first few races of the season behind us those big black tire marks down the side panels and deep nose cone scratches begin to grow and multiply. Though these marks are nothing more than racing evidence of wheel to wheel action they eventually become eye sores on a once […]

Maintenance Keeps Your HM-100 A Star

Every racing engine needs regular maintanance and the Tecumseh Star is no different. Basically, the needs of this boomer are no different than the needs of a Briggs stocker. Every regularly scheduled maintenance session should begin with a complete tear down, cleaning and inspection. Look at the condition of the cylinder, the bearing bosses, the […]

Durometer hardness of tires

Durometer Bridgestone Burris Dunlop Maxxis 36 YEL – YEX D21 KT5 – KT6 37 38 RS2 – RS9 39 40 YEC D25 41 42 YEM, YDE, YFA R6 – RM8 43 M30 44 YBQ R5 – RH7 45 YER, YFB 46 RH3 ? HG4 47 RH2 ? 48 YEF SL4 49 YEY-SL 50 D4 SL3 […]