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Everything Dirt Bike
Make / Model Specific
Yamaha
1978 YZ400 Piston Seized
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<blockquote data-quote="aoyue2702" data-source="post: 133762" data-attributes="member: 1291"><p>Ok. I already changed the jet size to 370, but of course I haven't got to ride it.... The damn piston for these things cost $150 so it may be a while before I try and get this running again <img src="https://www.dirtbikeaddicts.com/static/images/smilies/frown.gif" class="smilie" loading="lazy" alt=":(" title="Frown :(" data-shortname=":(" /> . Sure does suck throwing $200 down the drain (piston and bore job cost). A local shop had done the bore job, but they have recently become known for doing crappy work ever since they hired in drug addicts to do the mechanical work . I was worried they could have possibly screwed up the bore job on the cylinder.</p><p> </p><p>Do you think I also need to re-bore or what should I do about the cylinder?</p></blockquote><p></p>
[QUOTE="aoyue2702, post: 133762, member: 1291"] Ok. I already changed the jet size to 370, but of course I haven't got to ride it.... The damn piston for these things cost $150 so it may be a while before I try and get this running again :( . Sure does suck throwing $200 down the drain (piston and bore job cost). A local shop had done the bore job, but they have recently become known for doing crappy work ever since they hired in drug addicts to do the mechanical work . I was worried they could have possibly screwed up the bore job on the cylinder. Do you think I also need to re-bore or what should I do about the cylinder? [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
1978 YZ400 Piston Seized
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