Honda GB500 thread

Discussion in 'Old's Cool' started by Spurlock, Aug 27, 2016.

  1. Chankly Bore

    Chankly Bore Adventurer

    Joined:
    Sep 17, 2017
    Oddometer:
    36
    Location:
    Victoria, Australia
    Thanks,Allen. I'll gratefully keep your offer as a backup in case I get flim-flammed. If it goes well, (or Badly), I'll inform this forum of my experience. Did about 70 miles yesterday in 95 degree heat. Cheers, Charlie.
  2. AllenS

    AllenS Adventurer

    Joined:
    Jan 6, 2014
    Oddometer:
    26
    Location:
    Ben Lomond, CA
    Why don't we wait till you get yours (or not) and see if you really need my spare. Happy to leave it in the box where it now is resting peacefully than ship it off to Oz on the off chance that the one you ordered does not arrive.

    I will save it for you if you really need it. If not I will probably pop it on ebay and see if someone else needs one. Sound OK to you?
  3. Chankly Bore

    Chankly Bore Adventurer

    Joined:
    Sep 17, 2017
    Oddometer:
    36
    Location:
    Victoria, Australia
    Yes, Allen, that's what I intended to convey.If I'm lucky I should have my part ex Japan within three weeks, I'll let folks know of my experience. I'm not after hoarding parts, and I will happily help other people who intend to use their bikes. Sorry if my intended meaning was unclear- blame advancing decrepitude!
  4. AllenS

    AllenS Adventurer

    Joined:
    Jan 6, 2014
    Oddometer:
    26
    Location:
    Ben Lomond, CA
    NO worries. I will just hold onto the part just in case!
    Allen
  5. Spurlock

    Spurlock Long timer

    Joined:
    May 5, 2015
    Oddometer:
    1,043
    Location:
    Vacaville, N. California
    There are quite a few GBs listed in the Mecum auction in Las Vegas later this month. I didn't count but there must be 6-8. Suddenly they don't seem quite so rare.

    -Bill
  6. Scratch33

    Scratch33 you're going to feel a little pressure

    Joined:
    Jul 12, 2006
    Oddometer:
    5,943
    Location:
    But That's OK Corral
    Seven. Will be interested to see what they sell for.
  7. Spurlock

    Spurlock Long timer

    Joined:
    May 5, 2015
    Oddometer:
    1,043
    Location:
    Vacaville, N. California
    I've heard that when there are many of the same model, the last to go often sell for much lower prices than the first. That Dream 50R still in its original unopened crate is an interesting one.

    -Bill
  8. Nickosaurus

    Nickosaurus n00b

    Joined:
    May 3, 2017
    Oddometer:
    1
    Location:
    Silverdale, NZ
    Hi Allen, If you end up hanging on to that part, I'm interested (if Chankly doesn't need it). Mine has a rather ugly welded repair that I'd love to replace with an intact part. Cheers, nic
  9. AllenS

    AllenS Adventurer

    Joined:
    Jan 6, 2014
    Oddometer:
    26
    Location:
    Ben Lomond, CA
    Has anyone swapped the stock carburetor out for a Mikuni or Keihin flat sided unit? I have the XR650L engine and two carbs. One is a rather nasty looking stock GB500 and the other is marked as a NX650. The NX carb is completely disassembled with all the parts in a large plastic bag. At least I think all the parts are there.....

    With the price of kits and other bits I was thinking that it might be just as easy to buy a new carb. Both Mikuni and Keihin have pumper flat side carbs. Not great for fuel economy but performance should be better.

    Just curious if anyone has made the change and what their experience has been.
    Allen
  10. JCool

    JCool Long timer

    Joined:
    Oct 15, 2016
    Oddometer:
    3,589
    I've got a Mikuni TM40 pumper on a 650L. They're much easier to set up than the Keihin. Much better throttle response and it increased the midrange noticeably. Niche Cycle has the best prices.
  11. AllenS

    AllenS Adventurer

    Joined:
    Jan 6, 2014
    Oddometer:
    26
    Location:
    Ben Lomond, CA
    Thanks for your reply. Any issues with choke or with throttle cable? I read somewhere that the choke might be hard to reach and operate but the pumper should allow you to give it a couple squirts of fuel for cool weather starting.

    Any tips you can give me on the install or jetting will be appreciated!
    Allen
  12. JCool

    JCool Long timer

    Joined:
    Oct 15, 2016
    Oddometer:
    3,589
    I had to shorten my pull cable , Niche has cables for the L , though. My Keihin choke plunger and the fitting screwed right in , same threads , so I'm hooked up to the stock cable to the handlebar lever. You can get the carb with the knob or a short cable with a remote knob. I'm running a 160 main jet , came with a 165 and the 17.5 pilot that came in it , needle in the middle. This is a 54 HP motor at sea level, though. The accelerator pump on these (TM40-6) is externally adjustable for tip in and duration. I got my adapters from Mikuni Oz on Amazon.