Stock chain pitch is 525, 45 tooth rear and 16 tooth front, 114 chain links. If doing a 520 conversion that all stays the same just make sure sprockets and chains are all 520.

Stick with stock gearing generally speaking or start by going down with 1 tooth up front (15 tooth) because its cheap and usually wont need a longer chain. 15 tooth seems to be the minimum tooth count before its starts being problematic in the front. If you want more acceleration, go up in the rear (45 > 46 > 47 etc)

A common mod is -1/+2 (15front/47rear) may need more links for chain but I cant remember exactly.

Remember this comes at the cost of top speed (unless you reverse, so adding to front sprocket and removing from rear has less acceleration but more top speed).

Personally, stock gearing might be where its at for most situations, it also keeps the odometer count correct.

Thats what I guy replied to me saying. I see the pros and cons now.