Here is the bike engine and I am stuck here. Check the reference image, there is big gap between the support of that piston like thing. The base? In my model, there is no gap. I have placed the cylinders according to the reference, so If I move them far, they look odd.
It would be easier to see what’s wrong if you use the same angle as the reference image. Your cylinders to the right are too far to the left, they should be way more to the right where the “bump” is, you can also compare it to the things behind (should be more symmetrically placed).