Hi,
Thank for the reply. I have checked towerhobbies as well as ebay. The problem is that the round exhaust port engines are mostly rear exhaust. If that was the case with the engine which I have, then you are right there are a lot of them but in my case, its the side exhaust and for that i can not find any because the engine sits on the right side on the vehicle. The ideal engine would be a standard rectangle side exhaust engine but the one I have is round, picco style.
Thank you