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<blockquote data-quote="Stumpalump" data-source="post: 437556" data-attributes="member: 13140"><p>Higher altitude means it needs timing advanced. I lived at 6800' and still have property at 8500. Also make sure what little air you have can get thru the tiny cowl vents. I cannot believe those jets are special. What number is stamped on the jet? Not the Nissan part number. Take the jet to your local dirt bike or motorcycle shops and match it up. Advance timing first and try it first. Drilling jets is a last ditch effort to get a POS project moving again not on a keeper. If your in deep then mill the head. Your compression is down due to thin air. At 7000' you are down 20% power. Run the 85 octane gas that's sold at elevation.</p></blockquote><p></p>
[QUOTE="Stumpalump, post: 437556, member: 13140"] Higher altitude means it needs timing advanced. I lived at 6800' and still have property at 8500. Also make sure what little air you have can get thru the tiny cowl vents. I cannot believe those jets are special. What number is stamped on the jet? Not the Nissan part number. Take the jet to your local dirt bike or motorcycle shops and match it up. Advance timing first and try it first. Drilling jets is a last ditch effort to get a POS project moving again not on a keeper. If your in deep then mill the head. Your compression is down due to thin air. At 7000' you are down 20% power. Run the 85 octane gas that's sold at elevation. [/QUOTE]
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