75 Penton 400 sprocket sizes

[slvrbrdfxr]

Hi all,
I've got a 75 400 Mint that I'm in the process of putting back together. I need to put a new chain and sprockets on the bike which is where the question comes in. Can someone please let me know how many tooth sprockets came stock on this bike front and rear ?? I think the bike came stock with 530 chain and would rather replace it with a 520 if possible. I only plan to use the bike as a casual pit rider so would like to keep the stock gearing. Any help would be greatly appreciated. Thanks !!
Dave McCullough

[rob w]

Hi Dave,

Stock is 13 - 52

Bob W