August - Go Racing Magazine

Check the chain tension after tightening
the engine mount.
should also be set in the middle of the available range, so split the spacers
equally.
Rear track width should be set depending on the compound
of tire on your kart. A good starting point for hard compound tires
is approximately 52”, while a softer should be close to 55”. This is the
measurement from the outside of the left rear tire to the outside of the
right rear tire. Make sure the front and rear hub bolts are tight.
Next, you need to get a basic tire pressure. Each tire compound
has a different optimum operating pressure. This information can be very
difficult to find or not available at all. Generally speaking, the front tires
should be two to three psi less than the rear tires. This is because the front
tires have a much shorter and stiffer sidewall and don’t need that extra air
support like the rear tires.
Normally, the harder the tire compound, the more pressure you will
want to ensure maximum grip.
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The first thing I do is set my air gauge in the
seat. I never have to look for it.
I would recommend 10 psi in the front and 13 psi in the rear for a
soft compound tire, a 12/15 psi front/rear setting for medium compound
tires and an 18/23 psi setting for hard compound tires. These are COLD
tire pressure recommendations. This means that your HOT tire pressures
should be two to three psi higher after your run.
The next installment from Memo Gidley’s Secrets of Speed for Four-
Cycle Kart Racing we take our kart onto the track. This includes a look at
those first few important laps and what to look for along with an overview
on good maintenance practices.
For a complete listing of all SOS titles
go to www.mgspeedsecrets.com
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Page 42 Go Racing Magazine