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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: 209821" data-attributes="member: 3959"><p>Went to the FMF website and they recommend a 50 pilot and a 178 main jet, so I took out the 172 and put in a 178.</p><p>I left the 50 pilot jet in.</p><p>Gas is a mix of 2 gallons 100 low lead and 3 gallons 91 premium mixed at 32:1 w Yamalube.</p><p></p><p>Went for a ride yesterday and did another plug chop. One side of the insulator has a darker spot near the tip, and when I look deeper into the plug, there is an even darker spot or line underneath that spot. Unfortunately I cant get a decent photo of it, and since I'm colorblind I cant tell you what color it is.</p><p>Below is a photo of the spark plug after yesterdays ride.</p><p>[ATTACH=full]30098[/ATTACH]</p><p></p><p>This is the plug chop with a 172 main jet.</p><p>[ATTACH=full]30099[/ATTACH]</p></blockquote><p></p>
[QUOTE="Trfsrfr, post: 209821, member: 3959"] Went to the FMF website and they recommend a 50 pilot and a 178 main jet, so I took out the 172 and put in a 178. I left the 50 pilot jet in. Gas is a mix of 2 gallons 100 low lead and 3 gallons 91 premium mixed at 32:1 w Yamalube. Went for a ride yesterday and did another plug chop. One side of the insulator has a darker spot near the tip, and when I look deeper into the plug, there is an even darker spot or line underneath that spot. Unfortunately I cant get a decent photo of it, and since I'm colorblind I cant tell you what color it is. Below is a photo of the spark plug after yesterdays ride. [ATTACH=full]30098[/ATTACH] This is the plug chop with a 172 main jet. [ATTACH=full]30099[/ATTACH] [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
The 1999 YZ250
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