I want the eargasmic whistle mod from the triumph lineup on my KTM RC200. I know it's technically not possible as different camshafts are present.
Is there any other mediocre mod that can be done without damaging my bike too much?
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The whining sound you hear is your primary gear on the crank
Triumph chose to use a straight cut primary gear on the crank and outer clutch basket. This straight cut gear is the sound you are hearing.
Some manufacturers choose to put a bit of an angle or a spring loaded secondary gear to quiet things down a bit. That's not the case here.
This isn't a sound that involves gasses in your intake manifold or head construction coupled with an odd exhaust design.
You can't just replicate this sound on a bike without advanced machining and money.
This sound isn't the rotor pump for the oil either. They are very quite devices and are used in almost all modern motorcycles.