Results 1 to 5 of 5
  1. #1

    Join Date
    Jun 2021
    Posts
    3

    1998 Yamaha GP760 Rebuild

    Hi, I bought a 760 that had a blown engine. I never rebuilt an engine so I wanted a project to learn on. I removed the engine and totally rebuilt it. New crank, piston, rings, etc. Got it all back to gether and installed. I have a couple of questions about the fuel system.

    1. I assume the two lines are supply and return. On the carb there is a top and bottom nipple for the lines to connect to. Is the supply the top one?
    2. I disconnected both lines. When I pump the primer I can't get any fuel?? I assume there should be some?? Also, when I turn the engine over should fuel be pumping through that line?? Every thing else seems to have came together fine, just can't get fuel to it.

    Thanks so much in advance for any advice.


  2. #2
    tom_'s Avatar
    Join Date
    Aug 2020
    Location
    Finland
    Posts
    30
    +1
    1
    1. On the carbs there are arrow which show if it is an inlet or outlet, but top one should be outlet port.
    2. How is the primer connected? What I know there is no primer originally on these, what kind of primer is this?

  3. #3

    Join Date
    Jun 2021
    Posts
    3
    Quote Originally Posted by tom_ View Post
    1. On the carbs there are arrow which show if it is an inlet or outlet, but top one should be outlet port.
    2. How is the primer connected? What I know there is no primer originally on these, what kind of primer is this?
    So, I was wrong there is no fuel primer. There is a primer going to the oil tank. I guess it is to inject a little extra oil, if it was sitting or something like that???
    Do you know how the fuel system works in this? Is there a sending unit or small pump?? I see where it leaves the tank and through the filter and to the carb....just wondering how it gets there. Thanks.

  4. #4
    Quote Originally Posted by rossmi View Post
    So, I was wrong there is no fuel primer. There is a primer going to the oil tank. I guess it is to inject a little extra oil, if it was sitting or something like that???
    Do you know how the fuel system works in this? Is there a sending unit or small pump?? I see where it leaves the tank and through the filter and to the carb....just wondering how it gets there. Thanks.
    The fuel pump is built into the carbs. IF you want to add a primer, do NOT use a primer bulb like what is on outboard engines. Use something like this...https://www.amazon.com/DAPCO-Mikuni-...32762561&psc=1

    Rebuild your carbs and triple check them. Only use original Mikuni kits.

  5. #5

    Join Date
    Jun 2021
    Posts
    3
    Quote Originally Posted by WetTech View Post
    The fuel pump is built into the carbs. IF you want to add a primer, do NOT use a primer bulb like what is on outboard engines. Use something like this...https://www.amazon.com/DAPCO-Mikuni-...32762561&psc=1

    Rebuild your carbs and triple check them. Only use original Mikuni kits.
    Thanks so much for the reply. I did the carbs but might of did something wrong. If I disconnect the fuel lines from the carb should I feel suction from the carb???

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. 1998 Yamaha GP760 Wiring question
    By Diggerd83 in forum Yamaha Projects & Build Threads
    Replies: 1
    Last Post: 04-25-2018, 09:09 PM
  2. 97 yamaha gp760 with protech B pipe...have carb jetting/rebuild questions....help
    By oldschool69 in forum Yamaha PWC Performance (2-stroke)
    Replies: 0
    Last Post: 08-19-2012, 03:14 PM
  3. Replies: 7
    Last Post: 08-19-2012, 02:49 PM
  4. WTB - Parts 1998 GP760 Parts
    By dalepatter in forum Yamaha Classifieds
    Replies: 4
    Last Post: 04-20-2012, 07:21 PM
  5. WTB WTB - GP760 Charge Coil or Complete Stator Assembly. 1998 GP760
    By 1579 in forum Yamaha Classifieds
    Replies: 1
    Last Post: 09-09-2010, 11:12 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
  •