10 yz450 hard to start hot

1 reply to this topic
  • Keeponchuggin

Posted February 11, 2015 - 06:55 PM


I have a 2010 yz450 it starts right up when cold. Once it's hot especially if I'm riding single it's a monster to start again I have around 90 hours on it now I also have an FMF slip on with gytr tuner I'm using the map from the efi map forum from gytr for the less bottom end hit. My question is should I adjust the map to help hot starting or should I look at a top end.

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  • torkd14

Posted February 12, 2015 - 07:17 AM


If you haven't checked your valve clearances I almost guarantee that's what is causing this, might just have to put a couple shims in and the bike will start like new.


A new piston wouldn't hurt to do but it probably isn't necessary yet. I did a piston on my 2011 at around 130 hrs just as preventative maintenance.

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