Results 1 to 14 of 14

Thread: need help with valve springs on predator

  1. #1
    Join Date
    Jan 2014
    Location
    alabama
    Posts
    83

    need help with valve springs on predator

    Ive got a predator 212 and I'm fixing to put 10.8lb springs in it and I've watched you tube videos on how to install...one guy pulls the head off and one guy doesn't...I can install springs without a tool but when I take the spring off will the valve fall down in the head or not..I know to put it at top dead on each spring removal and tighten it down to .003 but just don't want to take head off...so will they fall down ?....

  2. #2
    Join Date
    Oct 2013
    Location
    Henry Va
    Posts
    1,490
    I use air (compression gauge fitting). The valve cant fall in if the piston is at TDC.

  3. #3
    Join Date
    Oct 2013
    Location
    iowa
    Posts
    5,861
    they should not. most use air to hold them up .
    Here is one way to be sure, get you some 1/4 cotton rope roll piston to bottom fed about 2 feet of rope in to cylinder then roll back to tdc this will keep them up .

  4. #4
    Join Date
    Oct 2013
    Posts
    3,565
    Remove the spark plug and feed about 12-18" of 1/4 rope into cylinder gently turn to TDC The rope will hold the valves in position.

  5. #5
    Join Date
    Oct 2013
    Posts
    3,565
    We are all in at the same times service with a smile

  6. #6
    Join Date
    Oct 2013
    Location
    Central, California
    Posts
    945
    Leak-down tester works great as well, but a .25 cent piece of rope works just 'as good' as a $700 L/D tester ans a $3000 air-compressor!

  7. #7
    Join Date
    Jan 2014
    Location
    alabama
    Posts
    83
    Thx for the advise guys ..sorry if its a dumb question this is my first kart and just wanting to do it right...you guys r awesome

  8. #8
    Join Date
    Oct 2013
    Location
    Central Kentucky
    Posts
    8,514
    Quote Originally Posted by sCREamnClones View Post
    Leak-down tester works great as well, but a .25 cent piece of rope works just 'as good' as a $700 L/D tester ans a $3000 air-compressor!
    If your paying $3000 for an air compressor, and $700 for a leak down tester, everything must be X3 or more on the price in Cali lol. Can get a good decent leak down tester for $100 or less some places, no more than $200, and a good air compressor for about the same price! Just saved you $3000+ right there, and can ship it to ya from Ky

  9. #9
    Join Date
    Oct 2013
    Location
    Central Kentucky
    Posts
    8,514
    Quote Originally Posted by bunk View Post
    Thx for the advise guys ..sorry if its a dumb question this is my first kart and just wanting to do it right...you guys r awesome
    Rope trick works perfect, air trick works great too. I usually dont have to do either one, just pop off the retainer and change springs, being careful not to push down on the valve when putting the retainer back on. After a few times doing it, you can get to where its easy to do without rope or air, just using your hands. With piston at TDC, you cant drop a valve in the cylender anyways, if the valve does go down at all, its only 2mm or so, and you can pull it back up with your fingers. If you have good oil seals, they usually hold the valve in place to keep it from falling down in the cylender any unless your pushing on the valve.

  10. #10
    Join Date
    Oct 2013
    Location
    Central, California
    Posts
    945
    Quote Originally Posted by Weddle Racing View Post
    If your paying $3000 for an air compressor, and $700 for a leak down tester, everything must be X3 or more on the price in Cali lol. Can get a good decent leak down tester for $100 or less some places, no more than $200, and a good air compressor for about the same price! Just saved you $3000+ right there, and can ship it to ya from Ky
    Nah....These were purchased for 'real' racing several years ago (Drag Racing) and they work well on lawn-mowers too...LOL! (If you don't 'have' the Best....you 'can't' be the Best!)
    Note: I DID buy a $30 LD Gauge but I didn't like what it told me...
    Last edited by sCREamnClones; 02-15-2014 at 11:11 AM. Reason: addition

  11. #11
    Join Date
    Jan 2014
    Location
    alabama
    Posts
    83
    Do you think k putting these green striped 10.8 lb aftermarket springs will help with power or just increase the life of the spring

  12. #12
    Join Date
    Oct 2013
    Location
    Central Kentucky
    Posts
    8,514
    Quote Originally Posted by bunk View Post
    Do you think k putting these green striped 10.8 lb aftermarket springs will help with power or just increase the life of the spring
    Springs are just gonna help you turn more rpm as you increase spring pressure, the added rpm is what helps you make more power. With 10.8lb springs, there is basically a point where the spring maxes out, no matter what brand 10.8 spring you use. Some just hold their tension longer than others. Iv had good luck with Dover's Rev Pro 10.8lb Red springs, they have lasted for 10 or more races if i always turn the engine back to TDC when i come off the track and shut it off. If you do that, you can make any good 10.8 spring last longer

  13. #13
    Join Date
    Oct 2013
    Location
    Charlemont, Ontario, Canada
    Posts
    26
    For a quick change a buddy showed me how to use a allen wrench to hold up the valve .... put short end in the spark plug hole and aim under the valve your working on. Just watch you don't drop the lash cap off the exhaust valve into the engine. If you do a magnet and some luck may retrieve it without pulling the engine apart

  14. #14
    Join Date
    Oct 2014
    Location
    Morrison Tn.
    Posts
    912
    With the predator rtc6 and rtc8 automotive style retainers the rope trick makes it easier. Helping several in a sealed predator class turning 5600 to 5800 rpm. You will see better lap times from stopping some valve flutter and float..Take Care

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •