There will be a dedicated article about this topic available on soon. I use an excel spreadsheet where I enter the numbers in mm and it returns the degrees. There is no good or bad way of measuring timing. I prefer measuring the distance using a caliper. The distance can then be used to calculate degrees. You can either measure timing with a degree wheel or you can measure timings by measuring the distance between the top of a port and the top of the barrel. First you measure the timing of the cylinder. If done right, the engine will burn fuel more optimal, giving you a bigger bang and therefore more fun )īefore you can start milling, you should do some measurements and calculations. Tuning a 2 stroke cylinder is done by changing port timings and increasing the port area. Part by part I dismantled the engine, until I was left with only an empty crankcase. The good news though was that the cylinder wasn’t damaged at all! It was actually in a pretty good condition, a sign that it ran with enough oil and got maintained properly. This gives a good idea of the amount of force the piston is blown down with on ignition! Therefore it is important to use the right bearings and high quality parts when building a performance engine. The piston pen is made of hardened steel and you need a lot of and friction to make it look like on the pictures. These are the things you don’t want to encounter when removing a cylinder. When I took off the cylinder I made a somewhat unpleasant discovery… The piston needle bearing was in pieces and ate away material from the piston pen. I started dismantling the engine for cleaning, tuning and rebuilding. Splitting the Engine Destroyed Needle Bearing Overheated Gudegeon Pin He bought another scooter with a minimal setup (70cc DR) to ride to work and asked me to upgrade his Runner. Unfortunately he had some electric problems with his ignition. The engine was already well tuned and he had a lot of fun riding it. The StartĪlthough he already had a respectable daily driver setup, he asked if I could take a “look”. He rode his scooter (Gilera Runner) on a daily basis and thus the goal was to create a well performing street race setup that is reliable and affordable. This can be done for certain parts but especially the engine should be seen as a single component where every part needs to match the other to work as expected. This post will explain the tuning process of a Piaggio engine I did for one of my friends back in 2010. Given the average tuner age of 15 to 19 it is particularly hard to finance this hobby and most of us tend to tune in a step by step process. We all know that scooter tuning is not exactly the cheapest hobby you can choose.
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January 2023
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