[JosepRomano]

Hey guys I'm wondering if anyone here has DG pipes on their yamaha rd 250 and what jet they used to make it run right? I found a diagram saying to test 140- 155 main jets with this pipe setup, but was wondering if someone has an exact jet size that works?

 

[Unkle Krusty]

The correct jet can only be determined by tests at WOT, preferably going up a hill. You start with the main jet.
There are tuning guides on line.

UK