New rider

2 replies to this topic
  • mwtrent

Posted June 19, 2015 - 01:11 PM


Hello everyone!  Just took delivery of a new 2014 YZ450f here in Virginia.  I took it for a quick spin around the neighborhood before throwing it in the garage and my first thought was  Holy shit; what did I get myself into.  I'm 38 and have owned and ridden many street bikes in my time but this thing is a completely different animal and I can't wait to get it in the dirt.  


I read the MXA review on the 2014 and one thing it mentioned was that the bike is very lean; would it make sense to richen it up a bit using a tuner and would that in turn make it run a little cooler?  Here is a link to the map suggested by MXA:




Anyways, looking forward to reading the vast amount of posts on here and learning as much as I can about these machines.

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

Posted June 20, 2015 - 06:46 AM


What a lot of people say about the MXA map is that it's 'filthy rich"; too far to the rich side.


BTW, running lean won't make a four-stroke run hot, and running rich won't make it run cooler.  Four-stroke engines are enormously more tolerant of sub-optimal fuel mixtures than two-strokes are, and lean mixtures are not at all dangerous to them until they get so lean that the engine starts to show signs of running badly because of it.  These would include stumbling, irregular misfiring, and pinging. 


On the other hand, the bike may seem to run OK on a mixture so rich that it contaminates the engine oil with gas constantly, reducing its effectiveness, and interferes with piston lubrication. 


Re-mapping should be based on what you like, not what the wrecking crew likes.  Try a bunch of different ones and see what works for you, and where and how you ride.

  • mwtrent

Posted June 20, 2015 - 03:40 PM


Thanks for the response and the info! Good to know I don't have to carry my 2 stroke concerns over to the new bike.

Related Content


Thinking about Yamaha 250... by Arctic Pride

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies

Chubby dad, looking at bikes , First trip to the orange/black forum ! by Slow_ride

Dirt Bike   Make / Model Specific   KTM   250-530 EXC/MXC/SXC/XC-W/XCR-W (4-Strokes)
  • Hot  28 replies

Yamaha YZ450F 2017 by Chris.GVS

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

Megabomb Fitment by 288yz450

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

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F

Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 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.