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Everything Dirt Bike
General Dirt Bike
1993 Yz250 carb problems maybe air leak?
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<blockquote data-quote="jbird710" data-source="post: 232973" data-attributes="member: 132"><p>That jetting sounds incorrect. Is it running the stock carb? If so, stock jetting is 50 pilot and 178 main. Probably not getting enough fuel to idle and way too much afterwards.</p><p>The fast idle is probably a combo of being too lean and an air leak. Other than what’s been said, check the rubber intake to make sure it’s sealed and not cracked anywhere. You said it has a new top end; a leaky base gasket on the cylinder can cause the issue. I replaced the piston on one of my CR500s and some how the new base gasket got torn on reassembly - didn’t notice until I was at the track.</p></blockquote><p></p>
[QUOTE="jbird710, post: 232973, member: 132"] That jetting sounds incorrect. Is it running the stock carb? If so, stock jetting is 50 pilot and 178 main. Probably not getting enough fuel to idle and way too much afterwards. The fast idle is probably a combo of being too lean and an air leak. Other than what’s been said, check the rubber intake to make sure it’s sealed and not cracked anywhere. You said it has a new top end; a leaky base gasket on the cylinder can cause the issue. I replaced the piston on one of my CR500s and some how the new base gasket got torn on reassembly - didn’t notice until I was at the track. [/QUOTE]
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Everything Dirt Bike
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1993 Yz250 carb problems maybe air leak?
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