2012 YZ 450 hard starting

2 replies to this topic
  • Greg Pennsiltucky Lykens

Posted October 25, 2012 - 02:14 AM


My bikes, both the 2012 and 2011 are hard to start when hot in gear. If I take the time and put it in neutral it starts right away. Bikes start well when cold. I am using the Marmount map, slightly modified on the low end (more fuel) Anyhow, wonder if anyone else is having similar problems. Not a problem doing moto, but I am thinking of using my old bike for a harescrambles this weekend. Dead engine start.

This is not a valve related issue. Just doesn't like to start in gear when hot. Out of gear, first kick.

I use 1000 cc of Devlac oil. Stock air filter cage with GYTR air filters. One bike has 6 hours, other has 82. Both hard to start when warm, in gear. Always been that way

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • grayracer513

Posted October 25, 2012 - 06:52 AM


I know of no YZ450 that's ever been consistently easy to start in gear. Typically, there is just too much clutch drag in gear to get them to spin fast enough to start reliably unless the clutch is in near perfect condition. If mine lights right up for me, I usually do a Kevin Windham style shift into second (bring the back of the boot heel up under the lever as I raise my foot) and take off like that.

  • HRC

Posted October 26, 2012 - 10:00 AM


I would say that allmost all 450 fourstrokes are hard to start in gear !

Related Content


Is it worth it? (Cam and High compression piston) by macgi77

Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies

BIGBORE FOR YZ450F 2006? by Taattie94

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 5 replies

Megabomb Fitment by 288yz450

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 1 reply

Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • * * * * *
  • 1 review
  • Last review by Tommyk_55
  • On January 15, 2017


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  30 replies

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.