Welcome to NESR! Most features of this site require registration, including replying to threads, sending private messages, starting new threads, and uploading files. Click here to register.

Results 1 to 11 of 11

Head repair options

  1. #1
    Lifer Kurlon's Avatar
    Join Date
    Jun 2007
    Location
    Waterboro ME
    Age
    45
    Posts
    13,167

    Head repair options

    Anyone have suggestions for a shop that can do head repair? I've got a 2v head that stuck an exhaust valve with less than 15 minutes of runtime on the clock. Based on the scoring on the valve stems the working theory is the guides were too tight.

    I've got new internals, including valves/rockers and a cam, but I don't have the tools or expertise to ream out and clearance the guides, cut new valve seats or grind the valve stems to length.

    Oh, and to make things more fun this is a pitbike head so we're talking tiny valve stems (4.5mm or 5mm).

    0 Not allowed! Not allowed!

  2. #2
    Lifer Stromper's Avatar
    Join Date
    Mar 2010
    Location
    Eastern Ct
    Posts
    3,214

    Re: Head repair options

    Lapping compound and go at it

    0 Not allowed! Not allowed!

  3. #3
    Lifer Kurlon's Avatar
    Join Date
    Jun 2007
    Location
    Waterboro ME
    Age
    45
    Posts
    13,167

    Re: Head repair options

    Heh... ummm... it needs much more than lapping compound unfortunately. : )

    0 Not allowed! Not allowed!

  4. #4
    ^ It's my bike and my car tls25rs's Avatar
    Join Date
    Jun 2004
    Location
    Haverhill, MA
    Age
    52
    Posts
    3,604

    Re: Head repair options

    You could try Harry's Machine in Northboro Ma. It might be a little far from you but they are highly skilled and have helped me out recently.

    0 Not allowed! Not allowed!

  5. #5
    Lifer Kurlon's Avatar
    Join Date
    Jun 2007
    Location
    Waterboro ME
    Age
    45
    Posts
    13,167

    Re: Head repair options

    I'll give them a ring Monday. At this point I fully expect to have to mail the head out. I've been without the bike for a year thanks to this head, so waiting a little while longer for the postal service to do it's thing doesn't bother me as long as the end result is the head being right and reliable when I get it back.

    0 Not allowed! Not allowed!

  6. #6
    Lifer Expat's Avatar
    Join Date
    Mar 2007
    Location
    Worcester
    Age
    59
    Posts
    1,198

    Re: Head repair options

    +1 for Harrys, excellent reputation.
    If you want to use Harrys and are going to BoMo or to Tonys on the 4th, I could take the head and drop off / pick up for you. Not sure how I would get it back to you but it would at least save to some shipping!

    0 Not allowed! Not allowed!

  7. #7
    Changes come butcher bergs's Avatar
    Join Date
    Jul 2007
    Location
    the humbling river
    Posts
    12,909

    Re: Head repair options

    What are the chances that the guide ends are the issue rather than the entire guide needing to be reamed? Maybe look into smoothing out both ends? I dunno....just thinking out loud.

    Perhaps take an oversized drill bit and lightly go over the guide ends then check valve movement.

    0 Not allowed! Not allowed!

  8. #8
    Lifer Kurlon's Avatar
    Join Date
    Jun 2007
    Location
    Waterboro ME
    Age
    45
    Posts
    13,167

    Re: Head repair options

    I've considered that as a possibility, given the scoring it appears that the whole length of the guide was involved? This is why I want a professional to look it over rather than me guessing and potentially doing even more damage by trying to hack it.

    0 Not allowed! Not allowed!

  9. #9
    KB KB's Avatar
    Join Date
    Jun 2002
    Location
    Manchester NH
    Age
    51
    Posts
    8,171

    Re: Head repair options

    Kurlon my guy Jim Pidgeon will hook you up. Lemme know if you want his number.

    KB

    0 Not allowed! Not allowed!
    LRRS/CCS EX #13

    GMD COMPUTRACK

  10. #10
    Lifer Kurlon's Avatar
    Join Date
    Jun 2007
    Location
    Waterboro ME
    Age
    45
    Posts
    13,167

    Re: Head repair options

    Quote Originally Posted by KB View Post
    Kurlon my guy Jim Pidgeon will hook you up. Lemme know if you want his number.

    KB
    Much appreciated KB, if I don't make any progress this weekend I'll take you up on that.

    0 Not allowed! Not allowed!

  11. #11
    Lifer Kurlon's Avatar
    Join Date
    Jun 2007
    Location
    Waterboro ME
    Age
    45
    Posts
    13,167

    Re: Head repair options

    Welp, a bit of investigating later...

    The new valves are slightly smaller diameter, so yeah it was a guide clearance issue, got that sorted.

    New valve springs don't work with the old guides and guide seals, the inners are tight enough that you have to twist them on to get past the seals. So.... I'll be running seal-less till I can figure out a single beehive style spring setup I guess.

    0 Not allowed! Not allowed!

Similar Threads

  1. motorcycle tow options
    By DL98VFR in forum General Bike Related
    Replies: 6
    Last Post: 08-07-18, 06:00 AM
  2. Roberto is out of town- other suit repair options?
    By Petorius in forum General Bike Related
    Replies: 2
    Last Post: 03-17-16, 01:44 PM
  3. Silencer options?
    By Fitz in forum Pit Area
    Replies: 3
    Last Post: 03-10-10, 12:47 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •