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.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • 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.

Related Content


Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.