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  1. #1
    Super7Four's Avatar
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    15F: want more speed

    I have an 08 15F, love it, but would like to know the best mods to increase top end speed without hurting acceleration. I currently have a shred master ride plate......Is the next step exhaust and filter? I ride in the surf quite a bit as well, any concerns with choking out the R&D or Riva filter if they get wet?

    Any help is appreciated

    Thanks


  2. #2
    miniion26's Avatar
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    In my case the exhaust mod and the bucket intake mod gave me about 550 rpm.
    I overspun the prop, so I had to go with a 14/20 afterwards. The gain was at least impressive! I did the whole thing by myself and total cost was about 70 bucks.
    I only drilled the second hole in the baffle, and kept the original water flow.
    Those two mods will give you a lot of power, but you need to change the prop
    after this. Hope this helps.

  3. #3
    elviswongg's Avatar
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    hello

    Please what do you mean by (I only drilled the second hole in the baffle)

    do you mean the exaust mod ?
    thank you

  4. #4
    miniion26's Avatar
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    Ok, if you go here: http://www.rivamotorsports.com/instructions/rk16085.pdf
    You can see down the page what they mean by that. I just drilled the second
    hole, then I've welded the end back. That gave me some of my RPM. About 1 bar.
    The rest came from the air filter mod( posted by Chowski). All in one I was pushing
    7 and 2 bars before, and 7 and 5-6 bars after.(RPM, that is). So yes,
    as stated by other members here, it is a very effective mod. Very cheap too.
    I used a P-trap ABS pipe from the plumbing store instead of the Riva kit.

  5. #5
    Never Fast Enough caymanian rida's Avatar
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    Quote Originally Posted by Super7Four View Post
    I have an 08 15F, love it, but would like to know the best mods to increase top end speed without hurting acceleration. I currently have a shred master ride plate......Is the next step exhaust and filter? I ride in the surf quite a bit as well, any concerns with choking out the R&D or Riva filter if they get wet?

    Any help is appreciated

    Thanks
    Yea go with the free flow and Air filter next and the Riva filter comes with a water proof mesh i Ride in nasty conditions all the time and never had a problem yet with my Filter so it is safe and as said you may need a prop after that.. for top speed I think its the 14/21

  6. #6
    elviswongg's Avatar
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    Well you right that,s why they called it RPM kit,

    cause my mine have 7 and 3 bars i got the ride Plate but in 09 there is just one water box, but guees the mod could give me more RPM

    what about the sound ?at cruising speed is it very loud ?

  7. #7
    Never Fast Enough caymanian rida's Avatar
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    It will sound loud to you if you ride in a quiet Area or something but not to loud compared to the ultra it gives it just the right amount of noise

  8. #8
    elviswongg's Avatar
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    Well thanks i will probably do this mod by the winter season,

    i got a find a good welder to ! but there is a couple of weld shop around here.

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