Hi Kowalski you will find the engine number on the front half of cylinder,on the carby side.Just behind the fitting for the carby.No need to pull the dress cowl or cooling cowl off the top.Here is a picture to show you the where about's. It's not a great picture but you can see some of the numbers.It might have a build up of old oil and muck on it.
![[Linked Image]](https://www.outdoorking-forum.com.au/forum/uploads/usergals/2013/01/full-5048-9491-100_0978.jpg)