Page 1 of 6 123 ... LastLast
Results 1 to 10 of 53
  1. #1

    Join Date
    Jul 2015
    Location
    Chattanooga, TN
    Posts
    119

    Pop Off Too Low on Stock 1200 PV (66V)?

    When I rebuilt my carbs with genuine Mikuni kits, I replaced the bronze colored springs with the silver ones in the kit. When I tested pop off, the carbs were generally around 40psi (I didn't write it down, so I don't remember exactly where each carb popped off at).

    I'm not following Osidebill's "recipe". I'm keeping everything stock. Stock Flame arrestor, stock airbox, etc.

    Pilot Jets: 95
    Main Jets: 117.5
    Pop off: 40ish PSI
    High Speed Adjuster: Stock settings
    Low Speed Adjuster: Stock settings

    Do I have pop off set too low? I've heard people talking about "loading up", and I think that's what I'm experiencing. Throttle response is not crisp.

    Should I put the stock bronze colored springs back in? They popped off at over 70+psi

    If not the stock springs, what should PSI should I be shooting for? I have the 95 pilot jets, not the 87.5.

  2. #2
    Since you have a fatter jet now I would go back to stock springs. Sounds rich... clip a tad off and get 60s.

    I wouldn't clip your stock springs, but the heavier ones in the kit you can experiment with.

  3. #3
    Adam's Avatar
    Join Date
    Aug 2005
    Location
    Australia
    Posts
    399
    +1
    23
    The Oside Bill recipe works , these guys spent years getting it right with testing. Why question their experience? This engine format has not changed . Follow the recipe and the cakes turn out perfectly.

  4. +1 by:


  5. #4

    Join Date
    Jul 2015
    Location
    Chattanooga, TN
    Posts
    119
    Because I'm not looking for performance. Just want to keep it (mostly) stock.

  6. #5
    Myself's Avatar
    Join Date
    May 2007
    Location
    North Central Arkansas
    Posts
    3,529
    +1
    242
    Then use the euro specs.

  7. #6

    Join Date
    Jul 2015
    Location
    Chattanooga, TN
    Posts
    119
    Quote Originally Posted by Myself View Post
    Then use the euro specs.
    Does euro spec use accelerator pump? What N&S size, and what is the target pop off PSI? If Bill's recipe calls for 125 main jets with aftermarket FA's and chokes removed, then why does the posted "euro spec" call for even larger 135 main jets in stock form?

  8. #7
    jeffg426690's Avatar
    Join Date
    Jul 2015
    Location
    Sarasota, FL
    Posts
    535
    +1
    50
    Put your stock springs back in. The high pop-off is correct for stock jetting.
    The Oside recipe is not really for performance although you do get a slight gain from it - read the thread in the stickies, he explains the reasoning very clearly.

  9. #8
    Tool Bag water worx's Avatar
    Join Date
    Aug 2006
    Location
    Sunny Fla
    Posts
    2,279
    +1
    120
    Quote Originally Posted by Robb235 View Post

    I'm not following Osidebill's "recipe".
    Then you will be doing it again.


  10. #9

    Join Date
    Jul 2015
    Location
    Chattanooga, TN
    Posts
    119
    Quote Originally Posted by water worx View Post
    Then you will be doing it again.
    If I'm staying stock? I sure hope not.

  11. #10

    Join Date
    Jul 2015
    Location
    Chattanooga, TN
    Posts
    119
    So I replaced the shiny silver springs that came in the rebuild kit with the stock bronze colored springs. I expected them to pop at 70+ psi, but they popped right at 50psi?? I don't understand that. I have the 1.2 N&S, so according to the chart, those should pop at 75psi.

    I guess I need new 115 gram springs?Click image for larger version. 

Name:	IMG_4741.jpg 
Views:	30 
Size:	85.4 KB 
ID:	448566

Page 1 of 6 123 ... LastLast

Thread Information

Users Browsing this Thread

There are currently 3 users browsing this thread. (2 members and 1 guests)

  1. Adam,
  2. steelmesh

Similar Threads

  1. FS - Parts Yamaha 1200 xlt '99 part out LI 66v engine low hours
    By phumb in forum Yamaha Classifieds
    Replies: 14
    Last Post: 08-05-2016, 06:24 AM
  2. wtb : 66V 1200 Power Valve Stock Crankshaft
    By onefastgpr619 in forum Yamaha PWC Performance (2-stroke)
    Replies: 1
    Last Post: 09-09-2012, 08:03 PM
  3. Stock high and low needle settings 1200 pv engine
    By leejax01 in forum Yamaha PWC Performance (2-stroke)
    Replies: 1
    Last Post: 02-26-2012, 08:34 AM
  4. FS - Parts Yamaha 66V 1200 PV GPR XL XLT Stock OEM Crank Crankshaft
    By onefastgpr619 in forum Yamaha Classifieds
    Replies: 6
    Last Post: 01-19-2012, 10:16 PM
  5. low pop off?
    By Lockout in forum Polaris How To & FAQs
    Replies: 4
    Last Post: 07-16-2008, 01:58 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
  •