2009 Yz450f top end rebuild, thinking about a 13:1 piston


5 replies to this topic
  • vic2340

Posted May 02, 2013 - 07:56 PM

#1

Hey everybody, I have a 2009 yz450f and the bike has quite a few hours on it so I think its time to do the top end before something bad happens. I was looking up pistons and I realized that a 13:1 compression ratio piston for my bike only costs about 30 bucks more. Stock compression ratio is 12.5:1, so seems worth it to me, however I have a few concerns. Will adding this piston create more strain on my engine? Will I have to run a higher octane oxygenated race fuel? Will this create any issues with my jetting if race fuel doesnt have to be used? And finally will I need to service this top end more often making it more expensive than that 30 bucks more in the long run?

  • Yzflier977

Posted May 05, 2013 - 03:31 PM

#2

Curious to hear any replies myself. I just did a top end about 6 hours ago (riding time) and I went back stock because I got a crazy good deal on stock top end components. But I was leaning toward a higher compression piston myself and had similar concerns.

  • vic2340

Posted May 05, 2013 - 08:20 PM

#3

Yeah it seems like nobody knows or cares about this topic. I think im just going to get a stock compression piston however, its not like I really need the extra power. A 450f stock should be enough power for anyones needs.

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  • Yzflier977

Posted May 06, 2013 - 06:56 PM

#4

Yeah this is what I ran into when I posted something similar a few months back. If you're going to go back stock try this link.
http://item.mobilewe...nid=57477540755

  • vic2340

Posted May 07, 2013 - 05:49 PM

#5

wow that has to be the best deal ive ever seen. Thank you so much for that link. I just have to know arent there more gaskets i will need then just the head and base gasket? I dont know for sure but I could have sworn their were more than that. Those by the way are the only gaskets given in that kit.

  • Yamaryder29

Posted May 07, 2013 - 05:56 PM

#6

That kit is the same one I just purchased. I have 4 hours on my new top end. The kit includes everything you need, however I would replace the timing chain as well if I were you. They tend to stretch after a while.

Edited by Yamaryder29, May 07, 2013 - 05:57 PM.






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