Results 1 to 9 of 9

Thread: Need RPMs

  1. #1
    There is no VooDoo like BadVooDoo NeVerMind's Avatar
    Join Date
    Sep 2005
    Location
    Hammond, IN
    Posts
    413

    Need RPMs

    I am turning 6950-6970 RPMs on a 14/20. What can I do to get the RPMs up to the 7100 area? I need the RPMs to get the speed.

    I have cut the air hole, I run Proks, I have the jetworks mod, I have not moved to oil in the pump. I have an AAT but do not have it installed. I have R&D 41cc heads with a layer of gasket removed. My R&D plate has been trued and coated with a durable epoxy (gave me almost 1 mph from off the shelf R&D plate) Trim tabs and intake grate have been coated as well. The visibility spot is gone, the siphon plugged up. I am dumping water from head # 3 overboard. I have not (yet) drilled holes in the bucket. I have ground the imperfections out of the stator.

    Have I missed anything? What else can I do?


  2. #2

    Join Date
    Apr 2006
    Location
    South MS
    Posts
    1,095
    VF3 reeds= 100+rpms

    advance keyway =60rpms

    87mm nozzle if you don't have already

    Then there's always porting and big bore

  3. #3
    PuprleNuprleGPR's Avatar
    Join Date
    Jul 2006
    Location
    Central FL
    Posts
    741
    His sig says he has the VF3s.

  4. #4
    philip_gpr's Avatar
    Join Date
    Dec 2005
    Location
    Canada
    Posts
    2,724
    +1
    3
    advance keyway - I wouldn't do that as well as using an Advent

    87mm nozzle - that is what is on your ski already


    I have a basically new 1300 top end (cylinders, pistons, head and PVs) that I would consider selling. Add porting to further raise HP.

    This would add a bunch of RPM!

  5. #5
    need4pwr's Avatar
    Join Date
    Jul 2006
    Location
    New Jersey
    Posts
    330
    philip,
    PM me. Why would you want to swap your 1300 cylinders?

  6. #6
    There is no VooDoo like BadVooDoo NeVerMind's Avatar
    Join Date
    Sep 2005
    Location
    Hammond, IN
    Posts
    413
    Quote Originally Posted by philip_gpr
    advance keyway - I wouldn't do that as well as using an Advent
    My Advent is on the fritz... I put it in for the first time this week and it fried. I am calling Advent today. How hard is it to put in the keyway?


    Quote Originally Posted by philip_gpr
    I have a 1300 top end (cylinders, pistons, head and PVs) with low hours on it (2-3 hours). I would swap my top end for your top end and $700. (and for an extra $500 or so we could get the 1300 cyinders ported)

    This would add a bunch of RPM - so much so you would need to get your impeller repitched to something like a 14/24.
    I don't understand why YOU would want to go 1200cc? I like the idea and the price, but I don't want the down time right now... I will consider that in the LATE fall.

  7. #7
    flyboy's Avatar
    Join Date
    Nov 2005
    Location
    Destin, FL
    Posts
    1,585
    phillip has many parts. I don't emagine those clinders are off one of his current skis

  8. #8
    PuprleNuprleGPR's Avatar
    Join Date
    Jul 2006
    Location
    Central FL
    Posts
    741
    Quick Question: I noticed that you said that you have the left cowling cut. Why isnt this done from the factory? Is that side more prone to water intrusion, and what happends if water intrusion occurs from there?

  9. #9
    There is no VooDoo like BadVooDoo NeVerMind's Avatar
    Join Date
    Sep 2005
    Location
    Hammond, IN
    Posts
    413
    Quote Originally Posted by PurpleNurpleGPR
    Quick Question: I noticed that you said that you have the left cowling cut. Why isnt this done from the factory? Is that side more prone to water intrusion, and what happends if water intrusion occurs from there?
    I'm not sure why the right side is open, much less why the left is not. I can't answer about the tendancy to get more water intrusion, but i'd guess it does less damage than the right side, where the air intake is.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Opinions Needed. Need RPM without cash....ha
    By allstar71 in forum Yamaha PWC Performance (4-stroke)
    Replies: 22
    Last Post: 05-27-2011, 10:42 PM
  2. Need help, No rpm's, not charging on mfd
    By gvnitup in forum Polaris Open Discussion
    Replies: 12
    Last Post: 05-22-2007, 12:13 AM
  3. I need to get my RPM's up-Any ideas.
    By Mongoose in forum Yamaha Old School Skis
    Replies: 28
    Last Post: 04-27-2007, 05:12 PM
  4. **merged from original thread** need more rpm's
    By TILERYBOY2 in forum Yamaha PWC Performance (2-stroke)
    Replies: 136
    Last Post: 10-07-2006, 04:43 PM
  5. need more rpm's
    By TILERYBOY2 in forum Yamaha PWC Performance (2-stroke)
    Replies: 3
    Last Post: 10-04-2006, 09:27 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
  •