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Everything Dirt Bike
Make / Model Specific
Yamaha
1978 YZ400 Piston Seized
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<blockquote data-quote="Mihylo33" data-source="post: 133759" data-attributes="member: 408"><p>Yes you need a new piston</p><p>Yes the new carb needs to be jetted properly so that means increasing your jet size. </p><p>I hope you are running a 20:1 mixture in that awesome monster as well. </p><p>Before reassembly check your ring end gap and your piston clearance. </p><p>It sucks and I'm sorry to report this but this is how we all learned so you aren't the 1st one to do this....</p><p>Good luck and welcome to DBA!</p></blockquote><p></p>
[QUOTE="Mihylo33, post: 133759, member: 408"] Yes you need a new piston Yes the new carb needs to be jetted properly so that means increasing your jet size. I hope you are running a 20:1 mixture in that awesome monster as well. Before reassembly check your ring end gap and your piston clearance. It sucks and I'm sorry to report this but this is how we all learned so you aren't the 1st one to do this.... Good luck and welcome to DBA! [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
1978 YZ400 Piston Seized
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