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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?
 

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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
 
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