The Chonda didn't come with fuel tank, another reason I went with the BnS which did.
Unfortunately the fuel tank is one of the things on the new engine that necessitate the guard removal as it's on the opposite side and vertical with a fuel pump rather than gravity fed (?) from a horizontal tank that sat above the guard.
The original engine was a recoil start, new one is electric+recoil (yet another advantage over Chonda), so old one didn't have the starter to get in the way (although original XC had recoil or electric versions, but I don't have to tell you that).
Exhaust clashes on other side as its much bigger, as well as the starter.
As you may have seen from earlier foto of Loncin, I was hoping it was a matter of cutting a hole in the guard and maybe having to remove a wheel to do an oil change.