Quantcast
Jump to content

  • Do you own an ATV? Join our Forum!

    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.

bradmoore8

2002 Honda 400ex - Knocking

Recommended Posts

Hello, new to Quad crazy. I'd like to say thank you for having me. I bought a 02 honda trx 400 ex for $200 with 4 extra very nice ITP rims and tires for the dunes and 2 stock rims with drag rear paddles. didn't run. got it running. They owner before me said it has a big bore kit in it. Does that mean it's been bored .040? or could it be any sizes bore kit? And if it is .040 over. is it a 440? I've seen a 416 a 426 on the forum. so I'm not really sure of the size difference between stock engines and bored engine when there bored out. I'm at this point right now. bought a rebuild kit for the carb. On theses engines what would cause the engine to knock? A buddy sold me the quad and it was his sons so he didn't know what was wrong with it. just that it didn't run. I'm hoping to get a little help from the forum. how would u go about trying to figure out what is wrong. Would the bored out kit cause the motor to knock. It smokes kinda white sh blue smoke. I was also told the the connecting rod is pressed to the crank. if this is true can the connecting rod be removed from the crank to replace just the connecting rod or do I have to replace both? i'd like to rebuild just the top end. I'm a small guy only weighing 125lbs don't really need a bunch more HP. But what ever HP parts are in it. I'm going to try and replace them with the same. what rebuild kits would u use?Never rebuilt one before this will be my first. There seems to be a whole bunch of racing upgrades on this quad. The axles are even longer for better handling. Thanks everyone I'm new to all this. Thanks for reading all my questions!!!I want to ride real bad. Cant weight!!! Thanks again for having me and all your help!!! Thanks Brad

Share this post


Link to post
Share on other sites


Brad, I know nothing So all I can say is I hope you hit the trails soon. the white smoke and knocking wouldn't have diesel in the fuel ??? I just went though the same thing that's all.

Share this post


Link to post
Share on other sites

Could be a con rod bearing knock. Piston slap or maybe valves White blue smoke is burning oil. Rings or valve seals... Maybe a cracked head. This motor def needs to be taken apart an evaluated

Sent from my SGH-T989 using Xparent BlueTapatalk 2

Share this post


Link to post
Share on other sites

I'm going to start ripping in to the motor this weekend. What is piston slap? Is a part in the engine worn causing the piston slap? Thanks Brad

Share this post


Link to post
Share on other sites


Yeah piston slap is really noticable in diesel engines but in gas engines if the piston or cylinder wall is worn excessively it makes a knocking noise.

Sent from my SGH-T989 using Xparent BlueTapatalk 2

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Similar Tagged Content

    • By Wali
      I was riding my 400ex one day and when i shut it off to put it in the garage i tried to start it put again to drive it into the garge and it wouldnt start.I put a compression tester on it and its like 30 psi with out throttle and 0 psi WITH THROTTLE.
      when i put my finger over the hole it fell likes its pulling my finger in more then its pushing it out 
       
      Has good spark.When i took it into the shop the said it had 1oz of oil in it and a tiny pit of metal shaving(TINY BIT LIKE 30 flakes)
      When i try to pull start (push start/roll start) it made a not normal sound  and wouldnt stay running.
      If my bottom end is blow why would it still turn over fine,
      Are my valves siezed or not working properly 
      or is my timing off causeing valves to not open in correct order with fire 
      PLEASE HELP all help is appreciated 
    • By Hunter Aldridge
      Some times I get spark some times not can ride then it just dies and wont get spark it has new cdi box and stator but I don't know if it has the pickup coil I'm at a loss
    • By William Sims
      I have a 400 4by4 ,2005 green model,
      wounding how many different CDI boxes will work on it
       
    • By jerry houston
      Eiger 400 Suzuki runs fine Cook-Out joke face off the handlebars put it back on and will not start now will crank no no spark
    • By colin james
      View File 2012-2014 Polaris Sportsman 400 HD Service Manual
      This the factory service manual for the 2012- 2014 sportsman 400 hd service manual 
      Submitter colin james Submitted 02/08/2019 Category Polaris ATV  
  • Similar Topics

    • By Abbeypalm
      While cruising, my 2011 750 king quad suddenly shut down. As it happened, red lights on the display flashed. Any ideas? My head lights suddenly stopped working about a week ago, if that helps. I have no power at all. Thanks 
    • By Brennon Heflin
      So I bought a 2000 quad runner 250. I'm having some issues an wondering what it could be I replaced the pet cock valve an the fuel filter an pump inside tank I also put a voltage regulator on it. The problem I'm having is that when u give it half or more throttle it bogs down an loses power what could it be the bike is almost like new an cant figure it out any help would be great
    • By Susan Makowski-DeGraw
      My quad runs,  it starts up runs for about 10 minutes and then it dies if you let it sit for 10 minutes it’ll start back up ride for another 10 minutes and then die again, trying to figure out why it keeps stalling
       
       
    • By smitht18
      Looking for the rectifier.  Most bikes have near magneto.  It appears the KQ has it in front.
      Can someone tell me exactly where it is? 
      Bike not charging and magneto checks out ok
    • By Hunter19
      How are you doing guys I just joined I have a 1998 Suzuki King quad I’m having problems with high RPMs the ATV idols perfectly but soon as a throttle up it doesn’t stall but it just bogs down it has no power any suggestions thanks
  • Recently Browsing   0 members

    No registered users viewing this page.


×
×
  • Create New...