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View Full Version : LTZ400 wont start.


z400mayhem
07-31-2010, 08:03 PM
About a week ago i was having a problem with my ltz not working right, and when i took the plug out it was black.. And when i was driving it I had to keep gassing it so it wouldnt quit. Over the past week I changed my axle bearings, and today I wanted to take it out for a drive.. and it wont start . About every 5 seconds of holding the start button in it woud make like a backfiring noise almost sounding like it was about to start.. I know I am getting spark. What is wrong? Valves? Rings?

Ive had just about enough with the BS this bike is giving me.
Thanks.
cataway
08-01-2010, 10:43 AM
its all most all ways a problem with the valves that haven gotten to tight
z400mayhem
08-01-2010, 02:09 PM
I just checked compression.. Only 65-70 lbs.. not good. Would that cause it to not even start? I know its supposed to have 140.
cataway
08-01-2010, 02:47 PM
please check the valve lash , its very easy to do .
the quad is an 06 ?? its now 2010 , if you have never tuched them in the past then its about time to expect the valves to be tight
z400mayhem
08-01-2010, 04:03 PM
The top end was rebuilt in November of 09 by a mechanic, so im guessing the valves were checked then, but ill check them now, im just not sure what to look for.
wayne1ca
08-09-2010, 03:08 PM
Check out this white paper. The DRZ is the same motor as the LTZ

http://www.thumpertalk.com/forum/showthread.php?t=813179

Mike has some real good video's on checking valve clearance.

http://www.exriders.com/vbb/showthread.php?s=&threadid=433635