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Dirt Bike Brands - Other
new bike jetting
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[QUOTE="sjmaster, post: 671079, member: 47344"] I have a new YZ 250 R. The stock jetting according to the manual is #50 pilot and #175 main with N3EJ needle. I am at about 900 feet here at Lake Lanier. The bike runs great, but seems too rich on the low end. Also, I am not an aggressive rider, and will be learning for awhile, since I have not ridden since the 70s. My question is should I put the #48 pilot jet in and lower the needle clip from the middle posistion? Or just jet down and leave the needle alone. I am very expierienced in two stroke jetting on stand up skis (full race motor) but have not tuned bikes before. The plugs are black, and I have fouled a few, but I understand that is normal if you don't ride hard. Also, can you only get the 10w-30 type SE at bike shops, or is that regular auto oil. The manual says SAE 10w-30 SE. I have two tanks run through it now and would like to change the gearbox oil per the book. Sorry for the long post, Thanks, John [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
new bike jetting
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