Rod,
Thank you very much for big post, and I have no doubts now.
You are right, extra equipment is necessary for gas engine (unfortunately) I have forgot.
Now I am sure, I must buy the OS 1.20 FS
- 1.9 HP, big torque, economy, guaranty and your opinion of course - say it.

Thank you very much once again
It will be OS 1.20 FS
Best regards
Peter