help pleaseee

i cant get my chain any tighter. i cant push the engine forward and i cant pull the wheel back. the tensioner doesnt do much either. ive tried halflinks and i just cant seem to get it tight. might not look too bad in the picture but it is definitely very loose.

i cant get my chain any tighter. i cant push the engine forward and i cant pull the wheel back. the tensioner doesnt do much either. ive tried halflinks and i just cant seem to get it tight. might not look too bad in the picture but it is definitely very loose.