Measuring injector voltage and current

As you've probably already read in other posts, I created by myself an additional DIY ECU module, which I use to interface the original Honda ECU to the fuel injector. The reason why I added an ECU to regulate the injection timings is that I installed a bore up kit (166cc), which is requiring more … Continue reading "Measuring injector voltage and current"

Spark plug change on Honda CBR125R

Today I changed the spark plug of my Honda CBR125R. The installation of a new spark plug was very simple, it took just 15 minutes. First of all, you need to remove the fairings on the right side of the motorcycle. There are just 3 screws that you need to remove, please refer to the … Continue reading "Spark plug change on Honda CBR125R"

Electronic Fuel Injection (PGM-FI) of the Honda CBR125R

After installing the Athena 166cc cylinder and piston bore up kit, the Kijima and Daytona air filters, and the Akrapovic carbon racing exhaust, the quantity of air inhaled by the engine has been increased. As explained in other posts, in a gasoline internal combustion engine, it is necessary to inject the correct amount of fuel … Continue reading "Electronic Fuel Injection (PGM-FI) of the Honda CBR125R"

How PGM-FI Electronic Fuel Injection works

As many people already know, an engine is a system which transforms chemical energy into mechanical energy: an engine receives the energy from one or more types of fuel (for example, gasoline, in most motorcycles); this energy is transformed into mechanical energy (mechanical work at the engine shaft) and heat by mean of combustion. In … Continue reading "How PGM-FI Electronic Fuel Injection works"

Installing Athena 166cc bore up kit on a Honda CBR125R

In November 2015, I decided to change the original piston and cylinder of my Honda CBR125R. There are some bore up kits on the market, at least two: one sold by Malossi, and one sold by Athena. Unfortunately, in Japan, the Malossi bore up kit is not available, so I chose the one sold by … Continue reading "Installing Athena 166cc bore up kit on a Honda CBR125R"