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<blockquote data-quote="D8K" data-source="post: 43048" data-attributes="member: 648">The bike is pinging because the SST pipe is causing to much 'back pressure' on the piston. So by retarding the timing it will synchronize the exhaust waves with the piston. If the exhaust waves are synchronized with the piston the bike will not 'ping' or AKA fire before the piston is at TDC. I'm not bothered with about retarding the timing anyways because it will give the bike a smoother powerband and more top-end like what the KX85 has. <img src="https://www.dirtbikeaddicts.com/static/images/smilies/prof.gif"&nbsp; class="smilie" loading="lazy" alt=":prof:" title="Professor&nbsp; &nbsp; :prof:" data-shortname=":prof:" />Here's a good link to helping other people understand the basics of two-strokes and how easily they can be tuned... Once you become good at tuning two-stroke engines you can basically alter the powerband however you want with almost no mods... It really is that simple.... <a href="http://www.blasterforum.com/do-yourself-20/basic-2-strokes-tuning-evrithing-you-need-know-about-aftermarket-parts-parts-2-a-1935/" target="_blank">http://www.blasterforum.com/do-yourself-20/basic-2-strokes-tuning-evrithing-you-need-know-about-aftermarket-parts-parts-2-a-1935/</a> <img src="https://www.dirtbikeaddicts.com/static/images/smilies/thumb.gif"&nbsp; class="smilie" loading="lazy" alt=":thumb:" title="Thumb&nbsp; &nbsp; :thumb:" data-shortname=":thumb:" /> <img src="https://www.dirtbikeaddicts.com/static/images/smilies/prof.gif"&nbsp; class="smilie" loading="lazy" alt=":prof:" title="Professor&nbsp; &nbsp; :prof:" data-shortname=":prof:" /></blockquote>

[QUOTE="D8K, post: 43048, member: 648"] The bike is pinging because the SST pipe is causing to much 'back pressure' on the piston. So by retarding the timing it will synchronize the exhaust waves with the piston. If the exhaust waves are synchronized with the piston the bike will not 'ping' or AKA fire before the piston is at TDC. I'm not bothered with about retarding the timing anyways because it will give the bike a smoother powerband and more top-end like what the KX85 has. :prof: Here's a good link to helping other people understand the basics of two-strokes and how easily they can be tuned... Once you become good at tuning two-stroke engines you can basically alter the powerband however you want with almost no mods... It really is that simple.... [url]http://www.blasterforum.com/do-yourself-20/basic-2-strokes-tuning-evrithing-you-need-know-about-aftermarket-parts-parts-2-a-1935/[/url] :thumb: :prof: [/QUOTE]

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