Page 1 of 2 1 2 LastLast
Results 1 to 10 of 20
  1. #1
    Moderator OsideBill's Avatar
    Join Date
    Mar 2006
    Location
    United States
    Posts
    11,875
    +1
    30

    Can you see a problem in this picture?

    See if you can spot the problem, this is a SBN-I fuel pump from a GPR. Pics of both sides of pump.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Carb 278.jpg 
Views:	97 
Size:	1.20 MB 
ID:	115098   Click image for larger version. 

Name:	Carb 281.jpg 
Views:	94 
Size:	1.19 MB 
ID:	115099  


  2. #2
    Pistonwash's Avatar
    Join Date
    Aug 2005
    Location
    Florida
    Posts
    3,595
    +1
    77
    I can't see any creases...the check stays seem to be ok. What I am not seeing?

  3. #3
    Pistonwash's Avatar
    Join Date
    Aug 2005
    Location
    Florida
    Posts
    3,595
    +1
    77
    The rubber seal is gone?

  4. #4
    Moderator OsideBill's Avatar
    Join Date
    Mar 2006
    Location
    United States
    Posts
    11,875
    +1
    30
    Look at the check valves closely

  5. #5
    Moderator OsideBill's Avatar
    Join Date
    Mar 2006
    Location
    United States
    Posts
    11,875
    +1
    30
    This was from the other carb
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Carb 295.jpg 
Views:	101 
Size:	1.14 MB 
ID:	115110  

  6. #6
    krispaintballz's Avatar
    Join Date
    Sep 2007
    Location
    Kenosha, WI
    Posts
    2,978
    By the looks of it, maybe an external fuel pump check valve on a piggied fuel pump? If I worded it right. Bill that second pic might not be at a good angle. if not that maybe the check valve is in backwards. I heard thats what the line on a new one is for. Just thoughts........

  7. #7
    Moderator OsideBill's Avatar
    Join Date
    Mar 2006
    Location
    United States
    Posts
    11,875
    +1
    30
    Size matters. The first pic has two different check valves installed, one from a SBN carb the small 18mm dia one, and the correct one from a SBN-I carb 20 mm in dia. the pic a few posts down shows what we are used to seeing in the SBN carbs creased check valves. The diameter of the sealing surface in the fuel pump is the same in both carbs but the later models went to larger check valves. It is rare to find a creased check valve on the SBN-I carbs.

    The shop that supposedly rebuilt these carbs recently did not understand or notice the difference.

    pics of both fuel pumps SBN on left SBN-I right
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Carb 283.jpg 
Views:	56 
Size:	1.17 MB 
ID:	115117   Click image for larger version. 

Name:	Carb 282.jpg 
Views:	55 
Size:	1.11 MB 
ID:	115118  

  8. #8
    krispaintballz's Avatar
    Join Date
    Sep 2007
    Location
    Kenosha, WI
    Posts
    2,978
    They also use the bigger 20mm check valves in the remote/external fuel pumps? Or they another size?

  9. #9
    Moderator OsideBill's Avatar
    Join Date
    Mar 2006
    Location
    United States
    Posts
    11,875
    +1
    30
    I have not worked on any remotes so I can't answer that. I tried to fit the 20mm check valves in the SBN carbs just for an experiment and they will barely fit in the diaphram side but will not fit in the body side. I am thinking about clearancing it a bit and testing them out.

    Pic of 20mm check in SBN pump
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Carb 284.jpg 
Views:	62 
Size:	1.15 MB 
ID:	115119  

  10. #10
    Pistonwash's Avatar
    Join Date
    Aug 2005
    Location
    Florida
    Posts
    3,595
    +1
    77
    I was gonna say that!!!


    no, I was 'nt

    Nice catch Bill....who re-built them? Or do we need to say?

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. check this out, can you see the differences ...
    By Pale Rider in forum Yamaha Open Discussion
    Replies: 4
    Last Post: 08-05-2010, 12:44 PM
  2. You may find yourself in this situation helping others at risk.....
    By shawn alladio in forum High Performance Watercraft Safety
    Replies: 1
    Last Post: 08-02-2008, 12:55 PM
  3. can you see how many hours are on the gauge if the motor is blown
    By spyder3000gtvr4 in forum Yamaha How To & FAQs
    Replies: 1
    Last Post: 08-21-2007, 05:29 PM
  4. Can you help me figure out this supercharger dilemma?
    By JAG in forum 4-Tec Performance
    Replies: 22
    Last Post: 07-04-2007, 06:30 PM
  5. What do you think after looking at this picture?
    By WATER BONER in forum Open Discussion
    Replies: 45
    Last Post: 09-10-2006, 09:30 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
  •