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  1. #1
    quadzilla's Avatar
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    Exclamation 05 gpr power valves

    Yeah i Know it doesn't have P/V'S....

    But.....

    Heres the thing.....

    I have an 05 gp1300r
    i Also have in hand a set of 1200 gas valves...
    Plus getting some cores won't be to difficult for me..
    And messing with a perfectly good 41hr topend would be total insanity..

    Now from what i'm led to believe the 05-07 don't respond to porting
    Quite as well as the p/v motors do..??? (or do they since group-k lock the valves with their 1390)

    So say i want to chase some more performance....

    Do i:....
    A). Go to 1390..??
    B). Go to 1390 with gas valves..(since an 05 can't control mech valves)
    C). Stick with 1300 ported NO P/V's (opinions on this please..!!!)

    OR....

    D). Await suggestions from those who've been down this road before me..???

    Okay guys opinions and advice wanted...

    Gerry


  2. #2
    flyboy's Avatar
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    if you go 1390, sell your 1300 top end to cover some of the cost of the 1390

  3. #3
    Probably depends on what you want to spend. Cheapest bang for the buck would be to just port your cylinders. If you've money to burn, go 1390.

  4. #4
    quadzilla's Avatar
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    Question ????????????????

    Okay...

    Not quite in the scatter-cash league but could throw dough at this idea..

    So i guess flyboy's idea is good... sell the stock stuff..

    Then move on to the voodoo plan..

    So in the real world... what would the change over run me..???

    Bearing in mind i have good access to either 1200 or 1300 pv jugs (cores)
    Which are the better option 12's or 13's..??? 12's being more readily available..

    Or are the gas valve's not such a good idea..???

    I'm only thinking valves since i really miss the hit off my 1200 triple pipe ski..!!

    Also anyone who may be reading this....
    Thats had their 05-07's ported care to post their opinions please..??

    Gerry

  5. #5
    DRC 4 LIFE TheDome's Avatar
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    Contact Richard at WFO Performance.

  6. #6
    Duke's Avatar
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    The PROs about having PV cylinders ported and bored would be less down time and widest powerband. CONs would be more money and work to convert over. Depending on what you goals are I would consider boreing to 1300 and using OEM pistons for longevity.

    The PROs about porting your non PV motor would be cost and simplicity along with the ability to run OEM pistons. CONs would be limited CCs and a compromise of powerband. You will never get the bottom end and top end power out of non PV cylinders as compared to PV.

  7. #7
    quadzilla's Avatar
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    Question ??????????

    Good info so far guys...

    Any ideas on what this idea would run me financially..???

    Another thing that came to mind is does the exhaust header need to be changed for P/V cylinders..??

    Sticking with 1300 seems sensible since you don't need to dick around with the head/squish etc..

    What i'm wanting to hear about now is real world experiances from those who've
    Went ported or BB on non PV machines..??

    Also say i choose to get my cylinders ported do they need to be re-niked after the porting..

    One last question does this base gasket trick work on non pv 1300's..???

    Thanks guys..

    Gerry

  8. #8
    Duke's Avatar
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    Quote Originally Posted by quadzilla View Post
    Good info so far guys...

    Any ideas on what this idea would run me financially..??? $6/750 for porting, $650 for boring and renicking to piston choosen.

    Another thing that came to mind is does the exhaust header need to be changed for P/V cylinders..?? Pipe will work but might need some minor clearencing around gas valves.

    Sticking with 1300 seems sensible since you don't need to dick around with the head/squish etc.. That is one of the benefits.

    What i'm wanting to hear about now is real world experiances from those who've
    Went ported or BB on non PV machines..?? Mtrager is the only one that I know that ported his non PV. Rossnemo has a ported 1390 non PV but doesn't have a back to back. Runs strong though.

    Also say i choose to get my cylinders ported do they need to be re-niked after the porting.. Not if just porting is done

    One last question does this base gasket trick work on non pv 1300's..??? What trick? Are you talking about adding layers to change port heights? A non PV would lose bottom end from doing this.

    Thanks guys..

    Gerry

    There are a lot of variables on you questions. For example which portsmith you choose and plating company etc.. WFO might be able to pinpoint those #s a little better then me.

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