I started breaking in my first build yesterday and it's become apparent that a bigger rear sprocket is needed. I know the engine will have a little more power when broken in, but I weigh 250 and theres a lot of hills were I live. I found a 60 tooth sprocket from BGF and seen that King's make sprockets up to 80 tooth. Are there any other options? I thought about buying an off the shelf sprocket for #41 chain and drilling mounting holes in it, has anyone tried this?