Results 1 to 9 of 9

Thread: Valve Job:Recomendations

  1. #1
    Rally Rat
    Join Date
    Oct 2010
    Location
    Manley Hot Springs Alaska
    Posts
    140

    Valve Job:Recomendations

    I have 1983 R100 no history,18K dual plugged.There appears to be about 1/8"+ adj.on one and 1/8"-on the other exhuast valves.I,m aware of the seat problem.I'm looking for recomendations to have the work done and does anyone have experence dealing with Motro Works Pro.Machining,adv.in ABC,they look to have a quick turn around.Should I tear it down or just go for the valve job?

  2. #2
    Liaison 20774's Avatar
    Join Date
    Sep 2005
    Location
    San Antonio, TX
    Posts
    20,129
    Do you have any history or data points of the clearance closing up? That's what I'd base my decision on. If the gap began to close up rapidly, say every 500 miles, then I'd bite the bullet and do it. But if not, I'd be inclined to ride and check. At 18K miles, you're on the low end of the problem range. The 1000cc bikes were more prone to the problem, although my Dad's '81 R100RT went 65K miles with no problems...he then traded up to a KLT.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #3
    Rally Rat
    Join Date
    Oct 2010
    Location
    Manley Hot Springs Alaska
    Posts
    140
    I did adjust the valves 500 miles ago and one was closed and the other tighter,but here's the deal.I didn't rotate the engine to recheck after the inital adj.so I'm not sure if the second check is accurate.The one exhust valve has noticable less adj left.Like 1/16"

  4. #4
    Liaison 20774's Avatar
    Join Date
    Sep 2005
    Location
    San Antonio, TX
    Posts
    20,129
    Well, if you're getting that kind of closure rate (be sure and perform the setting and checking of the clearances correctly) and you have very little threads left on the adjuster, then you're probably looking at needing a valve job.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  5. #5
    Aspiring Profligate Jeff488's Avatar
    Join Date
    Apr 2007
    Location
    Nacogdoches, TX
    Posts
    1,100
    Ted Porter's shop does good work.

    http://www.beemershop.com/
    '08 BMW R1200RT
    '08 Suzuki DL650 "Screaming Yellow Zonker"
    Looking for Ed Sanders' Truck Stop.

  6. #6
    Registered User richardak's Avatar
    Join Date
    Dec 2007
    Location
    Fairbanks, AK
    Posts
    296
    Quote Originally Posted by Jeff488 View Post
    Ted Porter's shop does good work.

    http://www.beemershop.com/
    I had mine done by them last year. Very satisfied with their work.
    1983 R100RT hacked w/Cozy Rocket My blog
    2012 Ural Patrol
    Airhead #10576

  7. #7
    Registered User ebeeby's Avatar
    Join Date
    Mar 2003
    Location
    McKinney, Texas
    Posts
    569
    Porter does EXCELLENT work.

    However, he quotes turnaround time in dogyears so, 3 weeks = 21 weeks

  8. #8
    Sir Darby Darryl Cainey's Avatar
    Join Date
    Mar 2003
    Location
    Fenwick, Ontario Canada
    Posts
    2,637
    Hill Headworks,
    615 Northwest 45th Street,
    Seattle, WA
    98107


    5 years ago I had them install:
    unleaded vave seats
    4 new valve guides
    4 new valves
    valve job install
    bead blast heads
    repair one rocker stud, helicoil

    $350 including shipping to NY
    Ambassador Emeritus BMW MOA Ontario Canada
    Niagara Riders
    Knights of the Roundel #333
    1977 R100RS, (Retired) 1993 R100GS

  9. #9
    mymindsok
    Guest
    I recently sold the 1983 R100RS that that I rode Coast-to-coast in 2009.

    When I bought the bike, we did a very thorough mechanical refurbish and didn't see anything that might have been a serious problem but a few thousand fast miles later, the right head had developed a badly recessed exhaust valve.

    Heres the head. The intake valve loks fine but the exhaust valve is on it's way to China!:




    Heres whats left of the seat:



    Heres the valve:



    Luckily, I pulled the bike into the Airhead tent at the National Rally because I thought it needed a tune-up and one of the guys looked into the head using a flashlight and noticed the recessed valve. No wonder it was running so badly and additional 1K miles at my 80 mph cruise speed, would have seen the valve ingested and a lot of expensive damage, a long way from home.

    The 1983 R100 engines are known for developing recessed exhaust valves, so it's kinda, "Pay me now or pay me later", so don't fool around. If you intend to keep the bike, pull your plugs and look at the valves using an inspection light. If you can see a valve recessing, send both heads out to be refurbished as soon as you can afford to do so. You'll almost certainly want new valves, seats, springs, etc. If you don't see anything alarming, I'd still pull the offending head and take a close look at it.

    If MR CAINEY actually had his heads rebuilt for $350, thats an astoundingly good price! I had the Big Valve heads on my current R100 engine completely rebuilt using Black Diamond Valves and all bells and whistles and it cost me about twice that much.

    You should get some estimates and compare prices but have the work done by someone you who knows what they're doing and that you know you can trust to stand behind the job.

    PS; I don't use Ted Porter but he has a terrific reputation out here on the west Coast. I'll probably have him dual plug my heads when the time comes.

Posting Permissions

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