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  1. #31
    PWCToday Newbie kvogt8000's Avatar
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    high compression head

    I also am running the stock ignition and the air temp. Bypass.... I plan on adding the advent this summer.

  2. #32
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    Re: high compression head

    I am running the stock ignition with the temp bypass. The purpose of adding the Advent ignition would be so I could select or have a custom curve made for my application. I figured this would help my motor with the increased compression. I'm really trying to figure out the compression differences between the 29's and 28's that TBM sells.

  3. #33
    PWCToday.com Is My Home Away From Home jetman624's Avatar
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    Re: high compression head

    If your motor has not been decked or ported, TBM should be able to give you pretty close compression numbers. If either of the aforementioned have been done, you are on your own.

    Have you popped your head to look at the domes and make sure you aren't detonating as is? ANY sings of detonation would mean that you are on the fringe of pump gas for your compression and timing-- adding more of either would almost certainly spell trouble.
    Last edited by jetman624; 03-13-2013 at 01:32 PM.
    '02 SXi Pro: Factory Limited pipe, ported SXR cyl, SSP stearing system, WORX ride plate, skat trak intake grate, blowsion tubbie II, 3DR SS hull extensions, 3DR trued hull, 3DR pump shoe mod, bored pump nozzle

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  4. #34
    Attention ***** PWCToday.com Is My Home Away From Home JonnyX2's Avatar
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    Re: high compression head

    Use of the temp sensor bypass with increased compression is begging for detonation!

    Advent is the way to go, a real timing curve will make all the difference.
    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.

  5. #35
    PWCToday Newbie kvogt8000's Avatar
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    Re: high compression head

    good thing for you guys and this forum.... i onlyran mine on the hose for a lil, but ill be disconnectiong that bypass. anybody got a line on an advent ign. new or used

  6. #36
    Top Dog mattyv's Avatar
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    Re: high compression head

    I ran my 800 like that with no deto problems. Maybe I just got lucky

    Sent from my C771 using Tapatalk 2
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  7. #37
    PWCToday.com Is My Home Away From Home jetman624's Avatar
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    Re: high compression head

    The advents don't mean automatic safety. Depending on the curve you have, you can still heat up the motor and cause problems if you are putting around in an RPM range that has a lot of advance. You are walking a fine line with pump gas, increased compression, and advanced timing curves. You would be wise to error to the safe side on compression numbers if you want to run an aftermarket CDI.
    '02 SXi Pro: Factory Limited pipe, ported SXR cyl, SSP stearing system, WORX ride plate, skat trak intake grate, blowsion tubbie II, 3DR SS hull extensions, 3DR trued hull, 3DR pump shoe mod, bored pump nozzle

    '92 X2: Mostly stock, except for the 750

    '91 X2: #718

  8. #38
    Attention ***** PWCToday.com Is My Home Away From Home JonnyX2's Avatar
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    Re: high compression head

    Quote Originally Posted by mattyv View Post
    I ran my 800 like that with no deto problems. Maybe I just got lucky...
    Maybe you did. Its a known fact that running the temp sensor jumper with higher compression puts you right on the edge. Just one tank of sh*t gas will let you know Ask me how I know.

    The advents are awesome but jetman is right it doesnt mean automatic safety. You have to use the correct impeller so you can attain your motors peak rpm. If you have too tall of an impeller and it drags your rpms down, you risk deto from being in the rpm range where the timing is very advanced for too long. Advent has a curve for virtually every setup you can build.
    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.

  9. #39
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    Re: high compression head

    Quote Originally Posted by mattyv View Post
    I ran my 800 like that with no deto problems. Maybe I just got lucky

    Sent from my C771 using Tapatalk 2
    Were you running the TBM setup? Was it the limited setup? Did you use an after market ignition? Stock pipe?

    Do you recall what your compression was?

    I just tore down my motor and it looked great with 3 years of running. Domes and pistons looked good.

  10. #40
    Top Dog mattyv's Avatar
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    Re: high compression head

    R&D 29cc head, .5 mm bore, stock pipe, stock ignition w/jumper. I think it was around 180. No issues. Only had it like that for about 2 months though, then swapped back to a stock head
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