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<blockquote data-quote="SRAD97750" data-source="post: 158155" data-attributes="member: 425"><p>This would be an excellent example of when you would want to change your carburetor's jetting. When going from 70+Degree jetting to freezing temps. There are charts out there that can ballpark you given temperature or altitude change.</p><p>Some reading...</p><p><a href="http://www.iwt.com.au/mikunicarb.htm" target="_blank">http://www.iwt.com.au/mikunicarb.htm</a></p><p>[ATTACH=full]20437[/ATTACH] </p><p></p><p>So for example, If you have a 150 Main jet</p><p>Your start factor is at sea level at 68*F, then your current factor is .98.</p><p>The destination Factor is at 6400ft at 50*F, then your destination factor is .94.</p><p>So a change of .04 smaller.</p><p>150*0.04=6</p><p>150-6=144</p><p>You would look for the closest jet to 144 and see if that jet circuit performs better.</p><p></p><p>Remember, these are just estimates, so you'll have to jet with your ass-dyno to fine tune it.</p><p>-BIG DAN<img src="https://www.dirtbikeaddicts.com/static/images/smilies/thumb.gif" class="smilie" loading="lazy" alt=":thumb:" title="Thumb :thumb:" data-shortname=":thumb:" /></p><p></p><p>EDIT: lets do the math on your situation! For what conditions is the bike currently jetted?</p></blockquote><p></p>
[QUOTE="SRAD97750, post: 158155, member: 425"] This would be an excellent example of when you would want to change your carburetor's jetting. When going from 70+Degree jetting to freezing temps. There are charts out there that can ballpark you given temperature or altitude change. Some reading... [url]http://www.iwt.com.au/mikunicarb.htm[/url] [ATTACH=full]20437[/ATTACH] So for example, If you have a 150 Main jet Your start factor is at sea level at 68*F, then your current factor is .98. The destination Factor is at 6400ft at 50*F, then your destination factor is .94. So a change of .04 smaller. 150*0.04=6 150-6=144 You would look for the closest jet to 144 and see if that jet circuit performs better. Remember, these are just estimates, so you'll have to jet with your ass-dyno to fine tune it. -BIG DAN:thumb: EDIT: lets do the math on your situation! For what conditions is the bike currently jetted? [/QUOTE]
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