Picked up a 81 ATC 70 tonight

[250rmanfmf]

Hey guys, I picked up this atc70 tonight. It runs and is in actually good shape besides the seat. my plan is to swap in 140cc pisterpro motor and extend the frame a couple of inches for flat track. There are a group of guys here locally that get together and race them so I am thinking of doing the same. For those of you who flat track them what mods have you done? I would love to hear all the different setups. I have seen a lot of stuff already in these threads.

Thanks
Tyler138753138754