DIY Windowed Piston (Motorized Bike)

This is how I window my pistons with only one tool. It's fast, easy, and reliable.
Note: Windowing a piston will always weaken it, but I find this size and shape to work well for me.
My pistons with this style of window have run for years, and have reached 9k RPMs without breaking... I have no idea if they will hold up over 10K, Never pushed them that far.

Bits I use: https://www.amazon.com/gp/product/B07...

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FAQs:
Oil: 32:1, semi synthetic, random brands.
Gas: 87oct
Spark Plug: NGK B8HS (yd-100), NGK B6HS (pk80)
Parts: I buy mostly from Amazon.
Favorite Motor: Zeda (Firestorm) Triple 40
Favorite Carburetor: NT Speed
Favorite Bike For A Motor: Huffy Cranbrook

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