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.

Hayworth

86 honda 70 fourtrax rebuild question's

Recommended Posts

Newbee here and got a few questions for ya! I'm working on honda 70 and looking to find some aftermarket parts for it without going to local honda shop and spending a fortune. lol

I race karts here in NC and going to make a pit bike to ride around on and just wanting to hop it up a little.Just wandering if anyone knows where I could find a aftermarket cam with more grunt than a stock cam? My plans so far is to do some port'n and polishing on the head, boring out the cylinder and put'n in a little bigger piston. Can I get a piston and rings lets say .020 to .030 over? Also has anyone ever milled the head down for more cc's on these little motors? Would there be enough valve clearance if you did? Any help or advise would greatly appreciated! Thanks,,

Share this post


Link to post
Share on other sites


I moved this thread into the Honda forum, when you actually start the project, you can start a thread in the project room to document the process.

I always recommend Service Honda or Babbits online parts for good prices on O.E.M parts. As far as working on the machine, I know no one who has, nor have I. I do know that some parts may be hard to find. Although, most of these new knockoff m/c's and atvs use old Engines that are based almost entirely off of those old Honda motors, there may be some cross-compatability with parts, who knows.

Edited by DirtDemon

Share this post


Link to post
Share on other sites

Thanks for the reply. Right now I' waiting on parts to get here. I'm done with the port'n and polishing of the head and intake. I've milled the head down a few thousands to add a little more compression. Its funny you mentioned about parts interchanging. I was going to lap the valves in last night and noticed that the intake valve had all but pulled thru the seat. I got to looking around and found a GX 140 ohv engine in the corner. Pulled the valves out and wat u know they'll work! lol We use alot of parts off of the GX 140 -200 on our karts and can get parts dirt cheap. The oem valve for this 70 cost 20 bucks. The valve off of the gx, $5. lol

Share this post


Link to post
Share on other sites

Very nice, please keep in touch and let us know how everything goes. Feel free to post any pictures of the project as you go.

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 Topics

    • By tatjeff
      can anyone help me figure out year and on my grizzly i have no clue rode many of them very first ever owned 

    • By Red1
      Anyone know a good place for parts/plastics? I've seen junk for sale on eBay and overpriced. 
       
      I need the left side cover (triangle plastic) for my 1985 250es

    • By David Robinson
      Hello,
      Does anyone have any experience with Bronco or Race Driven shocks? I have a 1987 Big Bear 350 and looking for a rear replacement shock and those seem to be the only 2 brands available anymore.
    • By MarkinAR
      Picked this beauty up for zero dollars this weekend. It has been passed around several of my son's friends and the last kid was just tired of tinkering with it.  Mostly complete 96 300FW. The pic is my boy robbing the swing arm and rear diff for his 300 for a big memorial weekend ride. Wiring is garbage at the battery, kick start doesnt work, no coil, smoked like cheech and chong when it ran last. I figure a couple hundred and a few hours and this will be ready to ride. Journey will be documented on Instagram at @martincyclellc if ya wanna follow along. 

  • Similar Tagged Content

    • By Chase Cook
      Hi I was riding my Honda the other day and I gave it gas for about a quarter-mile just flooring it and then it started to lose power. I pushed it about a mile home which was a pain in the butt but when I got home It still had gas, compression and spark. Do you think the timing jumped possibly?
    • By goldenroot
      View File 2005-2006 Honda TRX500FE/FM/TM Fourtrax Foreman Service Manual
      Manual  covers the following models:
      2005 Honda TRX500TM FourTrax Foreman

      2005 Honda TRX500FM FourTrax Foreman

      2005 Honda TRX500FE FourTrax Foreman 4X4 ES

      2006 Honda TRX500TM FourTrax Foreman

      2006 Honda TRX500FM FourTrax Foreman

      2006 Honda TRX500FE FourTrax Foreman 4X4 ES

      Submitter goldenroot Submitted 04/19/2020 Category Honda ATV  
    • By goldenroot
      Manual  covers the following models:
      2005 Honda TRX500TM FourTrax Foreman

      2005 Honda TRX500FM FourTrax Foreman

      2005 Honda TRX500FE FourTrax Foreman 4X4 ES

      2006 Honda TRX500TM FourTrax Foreman

      2006 Honda TRX500FM FourTrax Foreman

      2006 Honda TRX500FE FourTrax Foreman 4X4 ES

    • By Arnold Schimberg
      Hi Guys
      I have 88 4trax FW , it has a booster circuit
      In the cdi control fed from a leg in the alternator. 
      MY Honda service manual says you will get no spark without this circuit on this model. 
      Can someone explain a little about this please ?    Thanks
    • By Guythis448
      Looking for help on wiring up stock wiring harness specifically for a '88 Honda TRX 300 
      If anyone could drop a link or send me a PM it would be much appreciated 
  • Recently Browsing   0 members

    No registered users viewing this page.


×
×
  • Create New...