Page 2 of 4 FirstFirst 1 2 3 4 LastLast
Results 16 to 30 of 49

Thread: Replace petcock with solenoid valve?

  1. #16
    '99 '03 '06 National Co-Rally Chair Friedle's Avatar
    Join Date
    Mar 2003
    Location
    Poughkeepsie, NY
    Posts
    1,484
    Perhaps your Internet search was not successful because you are looking for an answer to a question that nobody has asked before. Kind of like researching how to perform a high degree of difficulty dive from the 3 meter board when you don't know how to swim. Keep it simple, gravity works just fine.

    Friedle
    Ride fast safely

  2. #17
    Nick Kennedy
    Join Date
    Nov 2011
    Location
    Telluride Colorado
    Posts
    217
    Man
    Its just my opinion, but if you can't remember to turn the gas petcock on and off on a airhead to ride it and put it away properly.....
    Should you even be riding?

  3. #18
    Thank you for the useful input, of that it was supportive and thoughtful.

    This is one of the first, and it will be the very last of, visits to this forum as a trial member.
    I ain't thin skinned, but frankly surprised that the tone I expected of a forum of adult
    BMW motorcycle owners was so quickly disappointed.

    Cheap shots for no other reason, no good addition, than to have your fun at it?
    Who would go looking for any more of that when you can just leave the room?
    Not my kind of crew.

    Thank you moderators for the opportunity to check out the forum and your
    organization. I wish you all the very best in the future, sincerely.

  4. #19
    Liaison 20774's Avatar
    Join Date
    Sep 2005
    Location
    San Antonio, TX
    Posts
    19,379
    Sorry to see you go! Hope things work out with your project!!
    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. #20
    Registered User toooldtocare's Avatar
    Join Date
    Mar 2008
    Location
    DeLand Florida
    Posts
    1,972
    Being a long time member, since I bought my first BMW in the 80ís, I too am a bit surprised at some of the responses. I would like to apologize to our guest for those comments.

    Wayne
    MOA #39144

  6. #21
    Gerard jagarra's Avatar
    Join Date
    Aug 2016
    Location
    Reno, NV
    Posts
    338
    Rather than try for a solenoid, maybe a vacuum operated petcock would be easier to use in your case. Most Japanese bike use this type of petcock all you need is a vacuum source from your carburetors, no vacuum, no fuel flow. You then could just keep the other side off and only use it as a reserve.
    1994 R1100RS-(5/93)-,1974 R90/6 built 9/73,--1964 Triumph T100--1986 Concours

  7. #22
    Rally Rat 1074's Avatar
    Join Date
    Sep 2004
    Location
    Las Vegas, NV
    Posts
    416

    Cheap shots

    Quote Originally Posted by frascati View Post
    Thank you for the useful input, of that it was supportive and thoughtful.

    This is one of the first, and it will be the very last of, visits to this forum as a trial member.
    I ain't thin skinned, but frankly surprised that the tone I expected of a forum of adult
    BMW motorcycle owners was so quickly disappointed.

    Cheap shots for no other reason, no good addition, than to have your fun at it?
    Who would go looking for any more of that when you can just leave the room?
    Not my kind of crew.

    Thank you moderators for the opportunity to check out the forum and your
    organization. I wish you all the very best in the future, sincerely.
    Sorry that you were upset but I think a more detailed explanation may clear things up. Some of us tend to be a bit brief in our responses due to old age and the loss of ability to use many words in one thought. Many of us who have been around Airheads for a long enough time can tell you some horror stories pertaining to the latest models that came with just such electric solenoid operated petcock apparatus as you are looking for. You can in fact, find all the parts needed at the parts site at MAX BMW.
    Those of us who know of this stock system can probably go on for a while about the problems associated with it.
    Even more of us who are somewhat more motorcycle savvy can tell you about the similar fail made by Moto Guzzi back in the 1980s with a similar contraption.
    Since most of us fall into the category of being "Geezers" who started out on 50s or 60s vintage machines we most likely learned the habit of shutting off the petcocks the hard way at an early age and, through he years have found great glee in seeing other more junior riders fall into the petcock trap!
    Even the late Ed Hertfelder once wrote an article about the pitfalls of remembering what position your petcock is in while racing in the dirt in New Jersey.
    Boxerbruce

  8. #23
    Curmudgeon nrpetersen's Avatar
    Join Date
    Sep 2004
    Location
    minnetonka mn
    Posts
    718
    I had a Honda (I think it was that one) that had a vacuum operated fuel shut off (actually two). It was a super bitch to get started in the spring or any time after sitting a few weeks because the starter had to grind so long to get vacuum before it would allow any fuel into the carbs before it could get running. Sure enough, the starter and battery soon started giving trouble. I finally got around it by artificially pulling a vacuum on the valve system (with my mouth!) just to fill the carb bowl. Then it would be good for a few weeks. Sold the POS 40 years ago.

    Same thing with electrical solenoid valves - especially if they are buried under the fuel tank.

    A wonderful fix for stiff Oilhead fuel cocks though is a product used in aircraft called Fuel Lube. It is a grease that does not dissolve in gasoline. Very sticky and works well in our petcocks.
    Retired w 2005 K1200LT, 2000 R1100RT, & 1975 R90/6

  9. #24
    Registered User lkraus's Avatar
    Join Date
    Nov 2011
    Location
    Central Ohio
    Posts
    1,465
    My '82 Yamaha Seca had a vacuum operated petcock that included "Prime," along with "On" and "Reserve" positions. Most of the time, I left it On. Let it sit a week and the gas in the bowls would evaporate to the point that lots of cranking was needed. Finally realized that Prime let gas flow without vacuum - turn to Prime, wait a few seconds to top off the bowls, press the button for an immediate start, return the valve to On. The last step proved to be important - Prime let fuel flow until the fuel was gone, including reserve.
    Larry
    2006 R1200RT

  10. #25
    Quote Originally Posted by nickrides View Post
    Man
    Its just my opinion, but if you can't remember to turn the gas petcock on and off on a airhead to ride it and put it away properly.....
    Should you even be riding?
    I'm a Noob here myself....and I must say...that comment, Nick...was totally uncalled for.

  11. #26
    Gerard jagarra's Avatar
    Join Date
    Aug 2016
    Location
    Reno, NV
    Posts
    338
    After I suggested going to a vacuum operated petcock, it may be more difficult than I thought. I was checking out options on e-bay, looks like many of the items offered are flange mount rather than having threads that may mate to the BMW tank. (then how do you find one that fits your threads?) I did see an in line vacuum operated unit, which would be a simple option, but since it was made for a small displacement motor it may starve the BMW. Next issue is does the carburetors on his R65 have a vacuum port? Maybe the simplest solution is to put a large reminder fixed to the face of the speedo that says PETCOCK. See if that helps him, no cost, no hassle.
    1994 R1100RS-(5/93)-,1974 R90/6 built 9/73,--1964 Triumph T100--1986 Concours

  12. #27
    Registered User Rinty's Avatar
    Join Date
    Nov 2005
    Location
    Calgary, Alberta
    Posts
    5,120
    Couldn't the petcock just be turned open for the whole riding season? I wouldn't imagine there's much fuel pressure on the carburetor float needles.

    I see the pre ride routine on these bikes as a bit akin to the one prior to flying a simple airplane; but without the checklist.
    Rinty

    "When you don't know where you're going, any road will get you there."

  13. #28
    Quote Originally Posted by Rinty View Post
    Couldn't the petcock just be turned open for the whole riding season? I wouldn't imagine there's much fuel pressure on the carburetor float needles.
    It could be. But here is the downside risk. If the float needle seeps the carb bowl can overflow and allow fuel to flow into the intake tract and cylinder. Them upon attempted startup that cylinder may achieve hydrostatic lock (fuel won't compress) and the result when the other cylinder fires is a bent connecting rod. This is not theoretical. It happens. Equally evil is the dillution of the oil when the gas arrives in the crankcase.
    Last edited by PGlaves; 08-11-2018 at 02:03 AM.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  14. #29
    Fortis Fortuna Adiuvat Omega Man's Avatar
    Join Date
    Jan 2010
    Location
    Mansfield,MA
    Posts
    12,981
    My experience, as I run a lot of engines, any time you can shut off the fuel flow in a gravity fuel deliver system- itís a good idea. The ethanol based fuels have generated such a wide range of problems with fuel systems, especially carburated/float bowls systems, it becomes a wild card as to whether the internals of the carb(s) will hold.
    I have experienced the hydro-lock, oil diluted with gas, gas on the trailer floors and all from the carb internals not holding.
    OM
    "You can do good or you can do well. Sooner or later they make you choose." MI5
    Mod Squad
    2009 F800GS 1994 TW200

  15. #30
    Nick Kennedy
    Join Date
    Nov 2011
    Location
    Telluride Colorado
    Posts
    217
    Hey
    I'm sorry if I ticked anyone off with my comment. But I stand by it. You've GOT to have a certain level of awareness to ride a motorcycle. The original poster called himself a idiot. In the the last year I've had two riding partners hang up the helmet after a series of spaced out caused close calls, like taking off with the side stand down, pulling into traffic in front of others, running out of gas in a bad spot, etc. etc. forgetting the fine points.
    Clint Eastwood once said " A man has got to know his limitations"
    Sorry for the tread drift....Try and stay safe out there.

Similar Threads

  1. Replies: 9
    Last Post: 02-12-2012, 02:30 AM
  2. Starter Solenoid?
    By Kirbster919 in forum Airheads
    Replies: 7
    Last Post: 09-02-2010, 08:59 AM
  3. Mystery Solenoid - what is it?
    By HuskyVarmit in forum Flying Brick K-bikes
    Replies: 3
    Last Post: 02-23-2010, 06:18 PM
  4. fuel solenoid
    By yankeeone in forum Airheads
    Replies: 17
    Last Post: 01-11-2010, 11:50 PM
  5. valve cover gaskets need 2 replace every time?
    By nhlkats in forum Airheads
    Replies: 26
    Last Post: 01-02-2007, 10:27 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
  •