Page 1 of 3 123 LastLast
Results 1 to 10 of 28
  1. #1

    Join Date
    May 2015
    Location
    England
    Posts
    56
    +1
    1

    Ultra 150 carb check valves help please.

    Could anybody tell me the correct way to install inline check valves on the ultra 150 oil lines to the carbs, I believe Yamaha use this method on the GP1200 but I'm unsure as have never seen inside the hull on one.

    The second carb on my ultra is absolutely rammed full of oil and I've tried absolutely everything to get the check valve working but it hasn't seemed to work.

    Any help would be appreciated, thanks.

  2. #2
    steve45's Avatar
    Join Date
    Feb 2008
    Location
    Texas
    Posts
    6,876
    +1
    662
    The Yamahas use an inline valve. Just cut the hose and install it in the existing oil line with the arrow pointing toward the carb.

    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Oil Valve.jpg 
Views:	90 
Size:	181.6 KB 
ID:	456574  

  3. #3

    Join Date
    May 2015
    Location
    England
    Posts
    56
    +1
    1
    Thanks Steve! I'll try and source some. I think only one, maybe two of the carb check valves are stuck, so will it affect anything if I put these valves in all three of the oil lines? Or is it best to only put them in the lines to the carbs with the failed valves? Sorry if it sounds a stupid question but I get pretty paranoid when it comes to oiling. Thanks!

  4. #4
    Shaman's Avatar
    Join Date
    Mar 2019
    Location
    Украина
    Posts
    9
    Quote Originally Posted by Skiriches View Post
    Thanks Steve! I'll try and source some. I think only one, maybe two of the carb check valves are stuck, so will it affect anything if I put these valves in all three of the oil lines? Or is it best to only put them in the lines to the carbs with the failed valves? Sorry if it sounds a stupid question but I get pretty paranoid when it comes to oiling. Thanks!
    Я не знаю поймёте ли вы мй русский язык.
    Цель этих обратных клапанов в масляной магистрали не дать завоздушить маслонасос со стороны карбюраторов. Проблема скорее всего в заклиневшем клапане разряжения масобака от чего и создаётся избыточное давление.


  5. #5
    steve45's Avatar
    Join Date
    Feb 2008
    Location
    Texas
    Posts
    6,876
    +1
    662
    Quote Originally Posted by Shaman View Post
    Я не знаю поймёте ли вы мй русский язык.
    Цель этих обратных клапанов в масляной магистрали не дать завоздушить маслонасос со стороны карбюраторов. Проблема скорее всего в заклиневшем клапане разряжения масобака от чего и создаётся избыточное давление.
    Translation:

    I don’t know if you understand my Russian language. The purpose of these check valves in the oil line is to prevent the oil pump from airing from the carburetors. The problem is most likely in the jammed masob tank discharge valve from which excess pressure is created.

  6. #6
    steve45's Avatar
    Join Date
    Feb 2008
    Location
    Texas
    Posts
    6,876
    +1
    662
    Quote Originally Posted by Skiriches View Post
    Thanks Steve! I'll try and source some. I think only one, maybe two of the carb check valves are stuck, so will it affect anything if I put these valves in all three of the oil lines? Or is it best to only put them in the lines to the carbs with the failed valves? Sorry if it sounds a stupid question but I get pretty paranoid when it comes to oiling. Thanks!
    Putting two valves in series would increase the pop-off pressure. I wouldn't do it.

    Of course, after you price these things, you won't want to buy three of them!

    Yamaha part number: 6R3-13183-10-00

  7. #7
    ncdoo's Avatar
    Join Date
    Nov 2007
    Location
    Eastern NC
    Posts
    2,048
    +1
    255
    Just curious but how does putting a check valve in the oil line increase the pop-off pressure in the carbs?

  8. #8
    steve45's Avatar
    Join Date
    Feb 2008
    Location
    Texas
    Posts
    6,876
    +1
    662
    Quote Originally Posted by ncdoo View Post
    Just curious but how does putting a check valve in the oil line increase the pop-off pressure in the carbs?
    It doesn't affect the pop-off pressure of the carbs, it raises the pop-off pressure of the valves. Their cracking pressure is about 4-5 PSI.

  9. #9

    Join Date
    May 2015
    Location
    England
    Posts
    56
    +1
    1
    Thanks Steve I was struggling to find them online! Is it possible to drill out the existing valves in the carbs so I'm relying solely on the Yamaha ones? Seems crazy to be gambling on whether the carb ones are working or not as it seems the only one which doesn't let oil in is number 1 and number 3 seems to be intermittent?!
    In fairness it has been stood for a while, but I'd had this problem before. Really don't want to smoke a fresh motor by doubling up check valves.

    Shaman are you saying the fuel tank check valve has created the excess pressure? It has failed actually but it's failed open, I can blow through both ways. Waiting on a new one. Shouldn't cause these issues should it??

  10. #10
    steve45's Avatar
    Join Date
    Feb 2008
    Location
    Texas
    Posts
    6,876
    +1
    662
    The best thing to do is drill a small hole near the top of each carb (near the choke plate) and press in a piece of 1/8" tubing. Run the oil line there and block off the original oil input.

    This is similar to the Yamaha system. The beauty of this is that the engine still gets oil, even if the carb gets plugged up and doesn't flow fuel.

Page 1 of 3 123 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Ultra 150 carb help please
    By Skiriches in forum Kawasaki PWC Performance (2-stroke)
    Replies: 8
    Last Post: 03-18-2019, 01:36 PM
  2. ISO: 03 Kawasaki Ultra 150, junk carb or oil check valve spring
    By Pharotek in forum Kawasaki Open Discussion
    Replies: 3
    Last Post: 07-30-2018, 11:24 AM
  3. GP1200R Carb Rebuild - Check Valves - Jet Sizes
    By MrMitch in forum Yamaha PWC Performance (2-stroke)
    Replies: 4
    Last Post: 03-14-2018, 11:48 AM
  4. ultra 150 and flow control valves
    By Meen95z in forum Kawasaki PWC Performance (2-stroke)
    Replies: 1
    Last Post: 12-02-2015, 07:30 AM
  5. STXR/Ultra 150 Carb Throttle position sensor carb link needed
    By Marauder1 in forum Kawasaki PWC Performance (2-stroke)
    Replies: 8
    Last Post: 07-09-2013, 12:10 AM

Posting Permissions

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