I added a window to the piston on my 70cc case inducted kit. Its pretty easy and allows the premix to flow much easier into the combustion chamber.
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Dremel Small Taper and Small Cylinder bits - https://amzn.to/48nAa0t
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Gear Links
Main Camera https://amzn.to/3qw1Cnt
Main Lens https://amzn.to/3qsSOPf
Wide Lens https://amzn.to/3pwmOdQ
Portrait lens https://amzn.to/32ooNbv
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Light https://amzn.to/3qw2SXJ
360 Camera https://amzn.to/3euCkjV
Selfie stick https://amzn.to/3pxJGJK