https://www.rctalk.com/forum/forums/nitro-rc-talk/
https://www.rctalk.com/forum/threads/nitro-tuning-tips-and-tuning-flow-chart.60832/
I think @cbaker has some youtube videos that he posted that are informational.
Traxxas has a 2.5 and 3.3. Both are the same engine just different piston. They share the same starter. The 2.5 is a .15, the 3.3 a .20. Traxxas other motor, pro .15 is also a .15 but no parts besides screws fit.
Thats why I said the specs are listed. They show the screw measurments. Use a...
Both of these have the specs.
https://www.ebay.com/itm/403331618430?hash=item5de870167e:g:KcMAAOSwuWVgdZ8R
https://www.ebay.com/itm/203015783018?hash=item2f44af026a:g:Ub4AAOSwEU5e3vA3