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Doing my first ever rebuild. Forgive me for my noob questions but I am new to working on engines. While taking the head off I did a leak test on the valves and there was no leak at all. Can I reuse the head or should I send it in to get rebuilt? The reason I'm doing a rebuild is because it wouldn't start and had little compression. Is there anything else I should be checking?
Thank you in advance, I am excited to learn and hopefully get this quad running!!
 

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On a 450r i wouldnt ever pull the topend without getting it rebuilt. All 450 topends are known for valve and topend problems. I would be really looking for why it had such low compression. Hole in piston? Broken ring? Blown headgasket? Something had to cause it. If all that looks good i would be worried there could be topend issues causing it. Good luck! And welcome to the forums!
 
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