Results 1 to 3 of 3
  1. #1
    stubburnjdh's Avatar
    Join Date
    Jun 2009
    Location
    Front Royal VA
    Posts
    365

    high and low speed jet questions

    Just trying to rap my head around the fuel delivery of the keihen carbs. Been trying to get my 900 tuned and got some questions. Now my highs are not adjustable. Now turning the lows out gives more fuel from stop to 1/2 throttle. Now at full throttle are the lows still producing fuel to support full throttle? If so then if you have the lows producing to much fuel then full throttle could be bogged down by to much fuel right? Thanks for any info


  2. #2
    casey67's Avatar
    Join Date
    Sep 2006
    Location
    Lemont,IL
    Posts
    2,571
    +1
    35
    I guess the answer is Yes, the lows do supply fuel at high RPM, but at a lower percentage compared to demand. The lows will not add too much fuel,not enough to drastically change the high mixture. I think I read the mixture screws on Keihin stop adding fuel at 3 turns, might have been 2 1/2 turns.

    How are you judging mixture-throttle responce-plug chops-piston wash?

  3. #3
    stubburnjdh's Avatar
    Join Date
    Jun 2009
    Location
    Front Royal VA
    Posts
    365
    Right now I'm starting over since i realized i had a bad reed cage So now I'm adjusting for throttle response and smoothness keeping it a little rich and then adjusting for top speed and performance by checking wash. Put a new set of plugs in to start out fresh

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Need help locating high and low speed adjustments on 97 xp
    By Mathischase88 in forum 2-Stroke Performance
    Replies: 1
    Last Post: 06-16-2015, 03:30 PM
  2. 97 gp1200 high and low speed needles
    By chris77 in forum Yamaha PWC Performance (2-stroke)
    Replies: 4
    Last Post: 06-02-2012, 12:59 AM
  3. WTB WTB High and low speed springs for carbs
    By salty in forum Yamaha Classifieds
    Replies: 2
    Last Post: 10-07-2010, 06:40 AM
  4. 1997 seadoo speedster Need to set high and low speed jets
    By marionr26 in forum 2-Stroke Performance
    Replies: 2
    Last Post: 04-20-2009, 05:40 AM
  5. high and low speed screw settings?
    By johnson7454 in forum Yamaha Open Discussion
    Replies: 1
    Last Post: 05-21-2008, 07:08 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
  •