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Everything Dirt Bike
Make / Model Specific
Yamaha
The 1999 YZ250
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<blockquote data-quote="Trfsrfr" data-source="post: 210973" data-attributes="member: 3959"><p>According to Boyesen installation instructions;</p><p>"Boyesen reeds tend to make engines run slightly rich on the main jet, and slightly lean on the pilot jet" and "If your carburetor has the stock main jet, it may be necessary to go down 1-3 sizes."</p><p>Stock is 172.</p><p>Because of what is above I decided to drop one size on the MJ and put in a 168.</p><p></p><p>Below is a pic of the plug after pulling into the staging area yesterday with the new reeds, and a CR480 in tow, slightly above idle, <em>no plug chop</em>, 168 MJ, above 1100 ft MSL;</p><p>[ATTACH=full]30500[/ATTACH]</p><p></p><p>Below is a photo of the plug from a month ago <em>before</em> the new reed install, with a 170 MJ, and a plug chop; [ATTACH=full]30501[/ATTACH]</p><p></p><p>@M33 - my gut is telling me to lean it further...</p><p>All thoughts welcome...</p></blockquote><p></p>
[QUOTE="Trfsrfr, post: 210973, member: 3959"] According to Boyesen installation instructions; "Boyesen reeds tend to make engines run slightly rich on the main jet, and slightly lean on the pilot jet" and "If your carburetor has the stock main jet, it may be necessary to go down 1-3 sizes." Stock is 172. Because of what is above I decided to drop one size on the MJ and put in a 168. Below is a pic of the plug after pulling into the staging area yesterday with the new reeds, and a CR480 in tow, slightly above idle, [I]no plug chop[/I], 168 MJ, above 1100 ft MSL; [ATTACH=full]30500[/ATTACH] Below is a photo of the plug from a month ago [I]before[/I] the new reed install, with a 170 MJ, and a plug chop; [ATTACH=full]30501[/ATTACH] @M33 - my gut is telling me to lean it further... All thoughts welcome... [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
The 1999 YZ250
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