It's depends on the gearing of the go kart, you could have all the HP in the world but not the right gearing and all its going to do is accelerate to its top speed then stop there, so you need better gearing
He didn't mention anything about gearing, just that a TC was added & a few go fast bits to the engine (albeit, not exactly the best parts...); theoretically, by only adding the TC, it
should be faster, depending on the size of the TC sprocket but, not by
much...
Investing in a billet flywheel is a good idea if your engine will be turning 8krpm, not so much if it's only doing 5krpm; a billet flywheel may be stronger but, it's also lighter; with the stock conrod & valve springs, the engine will still only turn around 5krpm before the valves start to bounce; with the lightweight billet flywheel the engine will reach max RPM faster but, it won't hold the RPM like a heavier steel flywheel...
That
may have something to do with it, it may not, the only way to find out is to refit the original & see what happens...
For future reference, no matter what the intended purpose of your engine, billet flywheel & harder valve springs are always
last on the list of mods, behind billet
conrod: the stock conrod will let go long before the stock flywheel does...
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