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  1. #1
    YamahaRacer447's Avatar
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    Easy Performance?

    So i am thinking about getting the Intake and FF Exhaust from Riva but the exhaust looks like a pain to put on... anyone done this themselves? Also is there any other cheap mods to do or website with good prices? I was thinking about cams once i get the service manual but until then...


  2. #2
    Fat Man, Little Boat Region8Ultra250X's Avatar
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    helps if we know what machine you are talking about

  3. #3
    Kroth Rocket
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    Quote Originally Posted by YamahaRacer447 View Post
    So i am thinking about getting the Intake and FF Exhaust from Riva but the exhaust looks like a pain to put on... anyone done this themselves? Also is there any other cheap mods to do or website with good prices? I was thinking about cams once i get the service manual but until then...

    The FF exhaust for both the 15F and 250X are similar. It's not bad, as long as you don't mod the primary box in my opinion. I have no welding experience, so I chose not to mod the primary. The rest of it just takes time and LONG arms!

    Depending on where you live, I probably would not recommend the intake. In light chop, it could take as much as 2 mph off your top end

  4. #4
    YamahaRacer447's Avatar
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    Quote Originally Posted by Region8Ultra250X View Post
    helps if we know what machine you are talking about

    Sorry about that... 2008 Kawasaki STX 15F

  5. #5
    YamahaRacer447's Avatar
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    Quote Originally Posted by Mike 15Fer View Post
    The FF exhaust for both the 15F and 250X are similar. It's not bad, as long as you don't mod the primary box in my opinion. I have no welding experience, so I chose not to mod the primary. The rest of it just takes time and LONG arms!

    Depending on where you live, I probably would not recommend the intake. In light chop, it could take as much as 2 mph off your top end

    Its going to be riden mostly in Ocean City Maryland, i have two lifts down there for skis and a boat...why would chop matter with an intake much?

  6. #6
    njrealtor55's Avatar
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    the intake grate will keep you hooked up in the chop so you speed in the bay will be faster overall... but in glass conditions the oem intake grate is faster. i rarely encounter glass - and i ride in a river w/ hardley anyone around.

    do a search on here for the cams - they are stock kawi streetbike cams (what riva used in the offshore kit). not sure how much you will see from them w/out a ported cyl head.

    get the riva kit and go from there. if you feel compelled to get to 70+mph you will have to get a custom turbo kit or vortex supercharger kit. or buy a rxp

    strizki's turbo 15f was gps'd about 3 weeks ago in the high 70's @ 11psi and 7300rpm. his next step is to up the boost to 15-16psi & hope to be well into the 80's with a re-pitch on the impeller to get rpms back to 7100.

  7. #7
    YamahaRacer447's Avatar
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    Thanks i appreciate the info

  8. #8
    inchadeboca's Avatar
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    heres a nice turbo 15f vid that will get u goin' on a turbo build


  9. #9
    Quote Originally Posted by YamahaRacer447 View Post
    the exhaust looks like a pain to put on...
    Why do you think it would be a pain?
    This is my $5-mod.

  10. #10
    RonJon's Avatar
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    Quote Originally Posted by meangreenman View Post
    Why do you think it would be a pain?
    This is my $5-mod.
    haha nice! Were you able to pull any more bars past 7000rpm on the tach after this mod? I can only get 2 bars past 7k with 85 degree air temp in salt water. what kinda gains did you notice, if any?

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