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Everything Dirt Bike
General Dirt Bike
Popping on decel cause???
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<blockquote data-quote="SRAD97750" data-source="post: 230948" data-attributes="member: 425"><p>Adjusting the idle fuel mixture screw out will provide the same results as a larger jet to a certain point.<strong> If</strong> more fuel at the mixture screw helps the situation, then a larger jet may be needed. I don't see a lack of fuel being your issue at all.</p><p></p><p>Idle mixture can cause a hanging idle if it gets too lean.</p><p>The exhaust system is after the cylinder, which has no effect on idle mixture.</p><p></p><p>No, probably not the culprit. That gasket looks pretty good too.</p><p></p><p></p><p>Food for Thought</p><p>What is the 'Popping?'</p><p>A rich condition causing unburnt fuel to mix with cold (oxygen rich) air leaking IN at the header, which allows combustion to continue in the exhaust pipe.</p><p>This requires <strong>extra</strong> fuel, more than the engine needed to run. A rich condition.</p><p>If you were running lean on idle mixture, there would be no extra fuel in the exhaust to 'pop.' Infact it would backfire out the carburetor and intake side in a lean condition. The fuel comes from that direction.</p><p></p><p>Remove the header and inspect the header seal up in the head. It may be folded over or pinched.</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></blockquote><p></p>
[QUOTE="SRAD97750, post: 230948, member: 425"] Adjusting the idle fuel mixture screw out will provide the same results as a larger jet to a certain point.[B] If[/B] more fuel at the mixture screw helps the situation, then a larger jet may be needed. I don't see a lack of fuel being your issue at all. Idle mixture can cause a hanging idle if it gets too lean. The exhaust system is after the cylinder, which has no effect on idle mixture. No, probably not the culprit. That gasket looks pretty good too. Food for Thought What is the 'Popping?' A rich condition causing unburnt fuel to mix with cold (oxygen rich) air leaking IN at the header, which allows combustion to continue in the exhaust pipe. This requires [B]extra[/B] fuel, more than the engine needed to run. A rich condition. If you were running lean on idle mixture, there would be no extra fuel in the exhaust to 'pop.' Infact it would backfire out the carburetor and intake side in a lean condition. The fuel comes from that direction. Remove the header and inspect the header seal up in the head. It may be folded over or pinched. -BIG DAN:thumb: [/QUOTE]
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Popping on decel cause???
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