125sx - ATVConnection.com ATV Enthusiast Community

KTM Discussions about KTM ATVs.


Old 04-10-2011, 03:56 PM
Thread Starter
Join Date: Sep 2010
Posts: 64
Default 125sx

I know it's not an ATV but I need help from some engine savvy people.

2004 KTM 125sx- I was riding through an open field in third gear and all of a sudden the bike started to cut out and it slowed it self down and then died. Now when I try to kick it over it feels alot harder to kick and when it fires I can hear a metal clacking sound. Something obviously broke but what would be the first thing you would do? Pull the head? I think maybe I worked it to hard without letting it warm up in the lower gears.
Old 04-13-2011, 10:50 PM
Join Date: Feb 2007
Posts: 33

I would pull the cylinder as it sounds like the bottom end of the rod. First pull the plug and turn it over by hand. pull the pipe and look at the exhaust side of the piston through the exhaust opening. If it all looks good then I would drain the radiator fluid, and pull the head to see the cylinder wall and top of the piston, if all is well there you will only have 4 to 6 more bolts to remove to pull the cylinder. That is where I think you will find your problem.
Related Topics
Thread Starter
Last Post
Introduce Yourself
02-01-2013 12:49 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools
Search this Thread
Quick Reply: 125sx

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: