Hi,
Last time a made a full service of my bike and decided to change steel gears for brass gears. Below I present some pictures of engine. First of all is quieter, but I don’t have any decibel meter so I can’t measure it ( do it by mobile phone is misunderstanding).
Ass you see engine is small. Someone ask about overheating, I don’t have this problem because I don’t use throttle only pedal assist. Case of engine it is also the radiator, so if someone decide to put extra radiator for the case may he will reduce the overheating problems.
If someone decided to open engine please be carefully for O-ring seal. Maybe you don’t know but you can’t stretch them, especially during cleaning. If you do this the diameter will increase and you need to buy a new one- lucky to find the same.
The whole engine is built with module parts, it will be easy to change it if one of them will damage. I don’t made photo of one of module the last one with chain gear, but inside it’s is only one gear who place between the transmission gears. I don’t change grease because I don’t clean the whole transmission gears, when I clean the steel gears they look ass new, I only put extra grease ( I receive it with brass gears). But it will be good to change this grease, for one of made it in Europe, it will be good for the transmission gears (maybe one of Kluber).
The ISCG mount you can used for firm the engine to frame ( stainless screw), you will make it by good metal file, drill it’s not necessary.
In my opinion the weakest point of this engine is “bike” chainrings, it’s made of steel and please look at the photo, diameter of whole will increase rapidly. I have made only 1000 km. This part I will change. I will made a new topic with cassette 11-50T, chain (with measurement) and DT swiss Rachet system, I think it will be useful for people who built new bikes, because I wondering how it works when I built my.