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Thread: LTZ400 wont start.

  1. 07-31-2010, 08:03 PM #1
    z400mayhem
    z400mayhem is offline Senior Member
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    Canada
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    LTZ400 wont start.

    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.
    06' 400ex
    Tusk Front Bumper
    Razr's on the back
    Tusk nerf bars
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  2. 08-01-2010, 10:43 AM #2
    cataway
    cataway is offline Registered User
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    Apr 2007
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    its all most all ways a problem with the valves that haven gotten to tight
    03 Z400
    13:1 JE piston
    95.5 bore
    +5 stroke
    RHC Ferrea valves +1 intakes
    P&P
    Barker performance pipe
    no air box
    dynatek cdi
    05 trx450r air boot
    42mm Sredrum TB fcr carb w//RAT 180&48@1000, 160&42@5000'
    RHC cams #208 &#187
    -16 flywheel
    drz manual engine decompresser
    06 clutch ,450r plates ,400ex springs
    12 paddle 22x12x8 skat-trak TB exstreems (72 rollout)

    Honda trx700xx, 751cc +3 stroke,+3 bore, +1 intake valves,

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  3. 08-01-2010, 02:09 PM #3
    z400mayhem
    z400mayhem is offline Senior Member
    Join Date
    Jul 2009
    Location
    Canada
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    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.
    06' 400ex
    Tusk Front Bumper
    Razr's on the back
    Tusk nerf bars
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  4. 08-01-2010, 02:47 PM #4
    cataway
    cataway is offline Registered User
    Join Date
    Apr 2007
    Posts
    900
    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
    03 Z400
    13:1 JE piston
    95.5 bore
    +5 stroke
    RHC Ferrea valves +1 intakes
    P&P
    Barker performance pipe
    no air box
    dynatek cdi
    05 trx450r air boot
    42mm Sredrum TB fcr carb w//RAT 180&48@1000, 160&42@5000'
    RHC cams #208 &#187
    -16 flywheel
    drz manual engine decompresser
    06 clutch ,450r plates ,400ex springs
    12 paddle 22x12x8 skat-trak TB exstreems (72 rollout)

    Honda trx700xx, 751cc +3 stroke,+3 bore, +1 intake valves,

    ________________
    Reply With Quote Reply With Quote
  5. 08-01-2010, 04:03 PM #5
    z400mayhem
    z400mayhem is offline Senior Member
    Join Date
    Jul 2009
    Location
    Canada
    Posts
    137
    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.
    06' 400ex
    Tusk Front Bumper
    Razr's on the back
    Tusk nerf bars
    Reply With Quote Reply With Quote
  6. 08-09-2010, 03:08 PM #6
    wayne1ca
    wayne1ca is offline Junior Member
    Join Date
    Nov 2009
    Location
    Lakeside, ca
    Posts
    16
    Check out this white paper. The DRZ is the same motor as the LTZ

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

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

    http://www.exriders.com/vbb/showthre...hreadid=433635
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