I would like to know if someone could help me identified this motor?
The only inscription are K&B and 3.5 ( for the engine size in cc I guess)
I have no experience at all in gas engine and I'm a little bit lost.
I would like to find the spare parts drawing for this model.
I'm looking also for the adaptor to be able to install an electric motor.
I found one but they indicate that this will not work with "OS lower units".
What would mean OS?
Thank you for your help.
![Image](http://i885.photobucket.com/albums/ac51/tycare56/20150615_213506.jpg)