Skat track 5 vs 6.5
pxctoday

» Log in

User Name:

Password:

Not a member yet?
Register Now!

» Find OEM Parts

» Jobs

» wallpapers

Page 1 of 3 123 LastLast
Results 1 to 10 of 23
  1. #1
    PWCToday Regular ROTZINGER's Avatar
    Join Date
    Jan 2011
    Location
    Cancun, Mexico
    Age
    28
    Posts
    121

    Skat track 5 vs 6.5

    Hey Guys!
    Iím back with yet another question!
    So letís say we have an x2 with a lightly modded engine (44mm sbn, WC intake, head, ex mani and pipe) and we place a skat track 5 and the we install a 6.5. what will be the difference?
    My logic tells me the more pitch will make it have more top end at the expense of low end power? does that make sense? Also just to make sure; skat track 5 has less pitch than 6.5?

    Thanks!

    BR
    87 kawasaki X2 with all the westcoast bolt on goodies
    88 Kawasaki 650SX
    01 yamaha XL700

  2. #2

    Re: Skat track 5 vs 6.5

    5 = 15*
    6.5= 16.5*

    6.5 will be too much load for your set up.

    Your theory typically is correct about adding speed and losing bottom end in most situations.

    With your set up changing to a 16.5 will probably loose bottom end and top end and add load and heat to the engine.

    I had a set up similar to yours and used a skat 8/15 with great results.

  3. #3
    PWCToday Regular ROTZINGER's Avatar
    Join Date
    Jan 2011
    Location
    Cancun, Mexico
    Age
    28
    Posts
    121

    Re: Skat track 5 vs 6.5

    Quote Originally Posted by 2strokesmoke View Post
    5 = 15*
    6.5= 16.5*

    6.5 will be too much load for your set up.

    Your theory typically is correct about adding speed and losing bottom end in most situations.

    With your set up changing to a 16.5 will probably loose bottom end and top end and add load and heat to the engine.

    I had a set up similar to yours and used a skat 8/15 with great results.
    So a 6.5 would work better with a stock pump and a 750 in the belly right?

    Enviado desde mi SM-G935F mediante Tapatalk
    87 kawasaki X2 with all the westcoast bolt on goodies
    88 Kawasaki 650SX
    01 yamaha XL700

  4. #4
    PWCToday.com Is My Home Away From Home fastgtfairlane's Avatar
    Join Date
    Apr 2010
    Location
    charlotte,nc
    Age
    37
    Posts
    3,476

    Re: Skat track 5 vs 6.5

    the 650 and 750 impellers will not interchange. yes it will screw on to both pumps but the spacing inside the impeller will hit the inner hub when tightening the impeller which will lock it up. it may work with a spacer however the farther the impeller is spaced away from the stator veins, the more pump efficiency you will loose.
    Last edited by fastgtfairlane; 12-01-2020 at 01:35 PM.
    96 superjet- rockered, -4, wide tray, adjustable footholds, kv148 mag setback pump, skat 7/14 impeller, rrp adjustable pole, blowsion ovp steering, 62t/62t, ada head, zeel A02T cdi, dual 44s, boysen power reeds, TNT SS chamber

    93-x2, newmiller ported SP750, milled head, R&D single 46 intake, sbn46, fpp blaster chamber pipe, hooker 9/15, umi, rhaas squirrel cage, dakine foot straps

  5. #5
    PWCToday Regular ROTZINGER's Avatar
    Join Date
    Jan 2011
    Location
    Cancun, Mexico
    Age
    28
    Posts
    121

    Re: Skat track 5 vs 6.5

    Quote Originally Posted by fastgtfairlane View Post
    the 650 and 750 impellers will not interchange. yes it will screw on to both pumps but the spacing inside the impeller will hit the inner hub when tightening the impeller which will lock it up. it may work with a spacer however the farther the impeller is spaced away from the stator veins, the more pump efficiency you will loose.
    I ment if you use a 750 engine with a 650 pump...

    Enviado desde mi SM-G935F mediante Tapatalk
    87 kawasaki X2 with all the westcoast bolt on goodies
    88 Kawasaki 650SX
    01 yamaha XL700

  6. #6
    Attention ***** PWCToday.com Is My Home Away From Home JonnyX2's Avatar
    Join Date
    Jun 2006
    Location
    Sin City USA
    Age
    57
    Posts
    30,374

    Re: Skat track 5 vs 6.5

    6.5 with a piped 750!
    Quote Originally Posted by Firebird A/C&Heating View Post
    OMG.....Rules for 550 vintage ski class...550 ski riders do not conform to any kind of rules. That is why you are riding a 550 ski in the first place. Rules suck....
    PS...the rule book will be in my 550 pump
    Quote Originally Posted by WB1994
    Listen , stop your cryin' , its only an X2.

  7. #7
    PWCToday.com Is My Home Away From Home fastgtfairlane's Avatar
    Join Date
    Apr 2010
    Location
    charlotte,nc
    Age
    37
    Posts
    3,476

    Re: Skat track 5 vs 6.5

    Quote Originally Posted by ROTZINGER View Post
    I ment if you use a 750 engine with a 650 pump...

    Enviado desde mi SM-G935F mediante Tapatalk

    ohh ok yes the 16.5 would good with a 750 engine and a pipe
    96 superjet- rockered, -4, wide tray, adjustable footholds, kv148 mag setback pump, skat 7/14 impeller, rrp adjustable pole, blowsion ovp steering, 62t/62t, ada head, zeel A02T cdi, dual 44s, boysen power reeds, TNT SS chamber

    93-x2, newmiller ported SP750, milled head, R&D single 46 intake, sbn46, fpp blaster chamber pipe, hooker 9/15, umi, rhaas squirrel cage, dakine foot straps

  8. #8

    Re: Skat track 5 vs 6.5

    Just not a #24 cylinder 750

  9. #9
    PWCToday Regular ROTZINGER's Avatar
    Join Date
    Jan 2011
    Location
    Cancun, Mexico
    Age
    28
    Posts
    121

    Re: Skat track 5 vs 6.5

    Quote Originally Posted by 2strokesmoke View Post
    Just not a #24 cylinder 750
    What is that? A bad batch of 750s?

    Enviado desde mi SM-G935F mediante Tapatalk
    87 kawasaki X2 with all the westcoast bolt on goodies
    88 Kawasaki 650SX
    01 yamaha XL700

  10. #10
    PWCToday.com Is My Home Away From Home wmazz's Avatar
    Join Date
    Jul 2013
    Location
    Riverside, CA
    Age
    61
    Posts
    2,788
    Blog Entries
    6

    Re: Skat track 5 vs 6.5

    Quote Originally Posted by ROTZINGER View Post
    So let’s say we have an (650) x2 with a lightly modded engine (44mm sbn, WC intake, head, ex mani and pipe)
    and we place a skat track 5 and the we install a 6.5. what will be the difference?
    It will increase the load, and your engine that is already running lean,
    it will run leaner with the 16.5 and no amount of jetting is going to fix it.
    The 16.5 will greatly increase the chance of a wide open throttle (WOT)
    seizure. Impellers load the engine down like a rev limiter, and unless you
    can make more HP @6500rpm or a lower rpm, or decrease the impeller
    pitch, or dramatically increase exit nozzle id, your peak rpm will not
    increase.

    Let us assume that your Westcoast pipe and exhaust manifold will add 14 hp
    to your peak horsepower @6500rpm. If your impeller is too large and holds the
    engine to ~5500rpm to 5800rpm, you will only produce a percentage of that
    14HP. Any "limited" or "ported" 2 stroke watercraft engine with a peak rpm that
    is less than the peak HP rpm by ~500rpm, is at risk of a wot seizure.

    In your case, it is very possible that your peak rpm is -700rpm lower than peak
    horsepower rpm. That load (-700rpm), will lean out your jetting, and increase
    combustion temperatures.

    Quote Originally Posted by ROTZINGER View Post
    My logic tells me the more pitch will make it have more top end at the expense of low end power?
    Your X2 is not a car or motorcycle with a transmission. It is direct drive and
    must pull the load from idle to WOT. Impellers can not be treated like a faster
    gear or sprocket to increase top speed. Only more horsepower at the same rpm
    can drive a larger impeller to increase speed. But normally, that isn't how it works.
    When you port an engine and use the same pipe, you make more HP at a higher
    rpm. Depending on your setup, you might be able to use the same impeller, or you
    a smaller impeller to reach the new higher peak hp rpm.


    A 8/16 works great on a stock 650.
    A 9/17 requires more HP, and works on a limited.
    A 13/16 requires more HP than a 8/16, or 9/17.
    A 15.5 requires more HP than a 8/16, or 9/17, or 13/16.


    Bill M.

    My advice is to purchase a tachometer, A large vise, and a large crescent wrench,
    and start by bending your 15 degree impeller's trailing edge up 1mm. Test peak rpm.
    If you need more rpm, bend your impellers leading edge down 1mm, and test peak
    rpm. That mod should get you in the ballpark. That should increase rpm by ~450 to
    600rpm. If you need more rpm, try the trailing edge for big changes, and the leading
    edge for smaller changes.

    Or get a 750 engine and test peak rpm with a 6500 to 6750, or 7000rpm goal depending
    on the cylinder. Many ported 750 and 800's are ported to SXI-Pro specs(7000 rpm).
    Last edited by wmazz; 12-02-2020 at 08:07 AM.
    Horsepower == Speed, RPM != Speed



Page 1 of 3 123 LastLast

Thread Information

Users Browsing this Thread

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

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBadvanced CMPS v4.2.0