How to Make My 6.5 HP Go-Kart Faster

Written by kristopher riggs
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How to Make My 6.5 HP Go-Kart Faster
Increasing the speed of a 6.5 HP go-kart engine can be done with a few mechanical tweaks. (Two racing endurance karts image by Nicola Gavin from

Go-karts are fun recreational vehicles that can be customised to handle better and go faster. Making a 6.5 horsepower go-kart accelerate faster can be done by performing a few minor tweaks to the engine. These tweaks require an understanding of the basics of an engine as well as some mechanical knowledge.

Skill level:

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Things you need

  • Metal saw
  • Screwdriver
  • Needle-nose pliers
  • Spark plug socket
  • Ratchet wrench
  • Spark plug gapper
  • Iridium-tipped go-kart spark plug
  • 3-mm drill bit
  • Electric drill

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  1. 1

    Determine the location of the muffler for the go-kart. Use a metal saw to remove the long metal tube as close to the muffler as popular. Remove the muffler entirely for even extra horsepower--though it will cause the engine to be extremely loud.

  2. 2

    Use a screwdriver to remove the throttle body from the go-kart's engine. Locate the throttle cable and determine if a throttle governor is present. Use needle-nose pliers to squeeze the governor until it can be removed from the throttle cable.

  3. 3

    Pull the spark plug wire from the engine's spark plug. Remove the spark plug using a ratchet wrench and socket. Replace the original spark plug with the iridium-tipped spark plug. Ensure that the gap of the plug is set at 0.30-mm with a gapper tool.

  4. 4

    Increase airflow to the go-kart engine by drilling holes into the air intake box. Open the box and remove the air filter to ensure it is not damaged. Use a 3mm drill bit to drill holes approximately one inch apart through the filter box. Clean the box thoroughly to remove any plastic from the holes.

Tips and warnings

  • Removing the muffler flow pipe causes an increase in exhaust, allowing the engine to perform at a higher efficiency. The option to remove the muffler entirely will create a large gain in horsepower--though it may be illegal in certain areas.
  • Governors are devices that cause the throttle cable to be limited from full functionality. Removing the governor allows the throttle to open to full capacity.
  • Iridium-tipped sparks plugs will create a "hotter" spark resulting in better piston response through the engine. These plugs have the potential to add horsepower to the engine.

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