does any one know the factory jetting specs for a 2002 scambler 400 4x4 2 stroke and also if anyone has a pipe on what are your specs I bought one from colorado and I live in Chicago much lower altitude want a ball park so I can rejet properly

 

Look under the seat and there should be a sticker with different settings.Do you still have the 34mm carb on it?I don't recall what I had in mine.I would think it would be close as is,given the altitude and cold climate,probably rich.It is easy to jet by reading the plug.

 

I use a 260 main jet with this pipe and the HPD airbox/K&N filter(240 with stock airbox). And the stock needle in the 3rd slot. And I'm pretty close to sea level here.