I think I may have a problem

The horisontal tube, just after the rear wheel, is welded alittle close to the wheel, and I have mounted the engine onto the frame, so the chain will run right underneath it! There's not much space between the tube and the chain, but the tandwiel that is on the engine, is a 10 tands! And the rear tandwiel is a 22 tands, so I'll probably have to put on a bigger tandwiel on the engine, and then it will hit the horisontal tube

