my son is 5 years old. He weighs 265 in the kart... we run on a little 1/10 th maybe smaller dirt oval track with hairpin turns.. We run predator 212 with red restrictor plate. my question is what tooth driver and rear sprocket size will be best...Also what gear ratio should i be looking for..... I run on the same track 12/63 but i weigh 390 lbs in the kart...
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