Jump to content

  • Join Today, It's Simple and FREE!

    As a member, you can post in our forums, upload your photos and videos, use and contribute to our downloads, create your own member page, add your ATV events, and even start your own ATV club to host your own club forum and gallery.  Registration is fast and you can even login with social network accounts to sync your profiles and content.


2012 TRX400X cranking/idle problems-Help Newbie Plea

Recommended Posts

  • Hi Everyone,
    We purchased a 2012 TRX400X that was running fine for a couple of days, then starting having problems cranking. We changed the spark plug & it ran great for a day (just playing around our property). Next day it wouldn't crank for anything, tried jumping it, still wouldn't catch. Had battery tested, it was ok. It had about 1/2 tank of gas, so we filled it up. It will now crank, but won't idle without giving it gas. If you let it idle, it will pop once, then turn off. Should we start with the carb? Anyone one know of a step by step guide to this?
    I'm downloading this manual today.....https://www.tradebit.com/filedetail.php/279289626-2005-2014-trx400ex-trx400x-sportrax-service-repair
    Our local shop is backed up for weeks! Any suggestions would be greatly appreciated!

Share this post

Link to post
Share on other sites

It sounds like plugged  jets in the  carb to me.   It's not uncommon  if it was sitting  for  a long time with  old gas  in the carb. A disassembly,good cleaning  and fresh gas  should fix  it.

Edited by davefrombc
  • Like 2

Share this post

Link to post
Share on other sites

Did you check the spark plug? Start there before tearing into the carb. 

If it's black and all soot try burning it off with a lighter, put it back in a crank if it starts fine your mixture is too rich and your fowling the plug.

  • Like 1

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.