In this video I show you how do do a number of performance modifications to the Predator 420cc engine. This engine is rated for 13hp stock, and after these simple mods it should put out about 20hp, but that's just a guess.
This video is longer and more tedious than my usual videos, but I tried to provide as much information as I could regarding these upgrades.

Times:
gas tank------------0:27
exhaust-------------1:00
intake----------------1:26
carb jet--------------7:25
governor------------8:30
low oil sensor---13:59
throttle linkage-15:43
valve springs----17:06

Intro music is "Garage" by Tropher Mohr and Alex Elena

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