I was able to pick up another Manco Dingo for the stable....this will be the third. I will be installing a HF 6.5 engine. As you all know the gas tank hits the back of the seat not allowing for any adjustment in the chain slack. I know that I could remove the tank and install something one on the back of the headrest or mount it somewhere else. I just wanted to get input from others on doing this. I am reluctant to cut the back of the seat support. Just wondering what the options are and would greatly appreciate any input from others or ideas on doing this without hacking up the kart too much. One of our other dingos has a HF engine but it was missing the engine mount when I got it so I just installed a new one farther back... so it works. Thanks in advance.