Deejay Sorry for the delay. Ive been in hibernation trying to hide from the world. I have attached a picture of the sprocket showing some naked teeth. I have not used the mower since fitting the new chain as i noticed a bit of vibration and noise which upon investigation has revealed a crack in the top deck. Although small at present it needs fixing. I think i may fit a smaller engine i think 3.5hp is to big. Cheers Steve