weger wrote on 05/15/21 at 11:27:25:Well here is the answer, its areal 400.
I am just exploring the engine, never had such before and as I mensioned before there is nothing known about this type here.
I ride bikes for over 50 years and never seen one before.
I found 2 liters ! oil/gas mixture in the aircleaner house, nor normal !!
And I am still trying to get it ready for the inspection for registration.
Newer ever seen this bike in Sweden.
But there was a similar Yamaha SR 500.. it seems that this bike was 400 in moste other countries.. probably some regulations about newbies?
And there is not nomal to find any oil or others in the airbox.. on any bikes/cars!
My suggestion is that the pistone rings gone worned out, putting to much of the presure going to crankcase?
And after exhauste regulation come to be world wide, there is a pipe that ends in the airbox!