250R, with stock carb and FMF pipe, What main?

[z400ACDC]

A friend of mine just got his 86 R rebuilt, new bottom and fresh bore. He is putting on a new gnarly FMF pipe. What main jet would you start out with? Thanks!

[baker250r]

um, i would say drop you needle a position and go from there.... probly 160 or 165..... lol, ask jeramiah jones.... i hear he is from bowling green.

[JTRtrx250r]

http://www.fmfracing.com/jetting_center.aspx

hope it helps:)

Jetting Information
Main Jet: 158-160
Pilot Jet: 58
Needle: STOCK
Needle Position: STOCK
Power Jet: N/A
Air Screw: 1.5
Fuel Screw: N/A
Comments: Remove airbox lid snorkel

[z400ACDC]

Thanks for the info!:)