How to Port Timing Calculator for Motorized Bicycles or 2-Strokes 1080p 

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Link to calculator : lambretta-imag...
Link to crank rod information : smolikperforma...
You will NEED digital calipers that have a depth gauge that comes out the side.
Using a port timing calculator can be more convenient and accurate than using a degree wheel to measure port timings in two-stroke engines. A port timing calculator allows you to input key engine parameters such as the cylinder bore, stroke length, and exhaust port height, among others. The calculator then provides you with the exact timings for your engine’s exhaust, transfer, and intake ports. This saves you the time and effort of having to manually measure the timings with a degree wheel.
In addition to convenience, port timing calculators can provide greater accuracy than using a degree wheel. Measuring port timings with a degree wheel can be challenging, particularly for novice engine builders who may struggle to interpret the measurements. This can lead to inaccurate port timings, which can affect engine performance. With a port timing calculator, you can be confident that your port timings are precise and will deliver optimal engine performance.