My trusty Motobecane TM4 had some issues that i’ve pushed off for some time now. The original cylinder was a bit weak and the engine needed some new bearings. The moped has sat many years, only had 1200 km on the odometer when i got it. That has led to condensation in the engine, everything above the oil level was a bit rusty, and especially the ignition side mainbearing.
The engine is easy to work with, took me 5 hours including cleaning and making my own gaskets. New bearings and seals.
My german model had a Gilardoni R2051 cylinder mounted, i’ve never been truly happy with it. I got myself a N2052 model with a bit longer port duration. I like the way it rides now, more power over all. Maybe i’ll upgrade the carb at some time, at the moment it’s a Dellorto SHA 14.12 that i’ve drilled to 13,5 mm venturi.
As per our tradition, we start the new season with a moped party in the easter holidays. Sadly the weather had forgot about us, we woke up to 10 cm snow. We kept the ride short and the party longer. Below are pictures and a video.
The end of the 2017 riding season is close, we celebrated this eventful year with a party. We the local artist and rapper L:Ron:Harald come by, to make us some grafitti artwork. While he was busy spraying, we rode our mopeds, raced them and had other fun challenges.
Another spreadsheet i’ve made, to calculate the speed of your moped at a given RPM. You need to know the details of your engine, gearbox, sprockets and rear wheel. You can find most of it in a spare parts catalogue, or simply count the teeth on all sprockets.
I’ve made a spreadsheet that you can use to calculate the ingition timing, to convert mm before top dead center to degrees, and reverse. I think the file is self explanatory, click the link below and try it out.
You can use MS Excel, OpenOffice, LibreOffice or a similar program.
This page uses a small amount of cookies to give me some basic stats and functionality on my website, your information is anonymised and hashed, i don't collect any personal information. If you continue to use this site, i will assume that you are happy with it.OK