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What are your opinions on removing the governor Should i do it or not? I believe it will be about 850ft long. We are racing on a very non busy road that is slightly down hill (only about 5 or less cars go past per day)Your calculations look about right. I didn't run them out, but 25 mph is about right for a stock kart with the governor still in place. What is the distance of your drag race? If the tires on your Barbie car are hard plastic like most, then traction is going to be a problem. You need to get some rubber on the road. Your running weight should be on the light side. Every vehicle has a driver, and every engine, predator, honda, briggs, ect in the 200 cc range weighs about
40 lbs. I would imagine that you will get rid of the battery and electric motor, so you should be able to get the bare vehicle weight lower than that of a go kart.
That could help with the gearing. You might be able to get away with 4.8 to 1.
If your opponent is running electric, he might be faster off the line but run out of
steam shortly after. That's why I asked how long the race is. The longer, the higher you can gear your kart. Chances are you won't get it perfect on the first try. Argue for more time while you wait for a bigger or smaller sprocket to arrive.