DRUMM Posted April 15, 2012 Share Posted April 15, 2012 hi, i have a 2005 yamaha dt 50 sm and im putting a 90cc big bore kit into it and i dont know what size of jets i need ,the jets in it are size 76 ,i have rung yamaha its self and they dont know , any help would be helpful, thanks Link to comment Share on other sites More sharing options...
PeterC Posted April 15, 2012 Share Posted April 15, 2012 An intoduction would be nice in the New Members forum. Link to comment Share on other sites More sharing options...
Keiran95 Posted April 16, 2012 Share Posted April 16, 2012 i have read up on a website that you will need to up jet to about 10-15% higher than the normal jet size, but its just trial and error with the jets, keep changing them untill it runs sweet Link to comment Share on other sites More sharing options...
DRUMM Posted April 16, 2012 Author Share Posted April 16, 2012 Ok thanks very much! Link to comment Share on other sites More sharing options...
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