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  1. #1

    2006 Yamaha FX HO riva exhaust expectations

    Hi guy. Finally joined the group after years of using it as a bible on ski. Hi all. Quick question.

    Recently purchased a stock ski as above. Had the usual saturated air filter issue, but ran ok ish after.

    Iíve in the last few weeks fitted;

    Riva air filter
    Riva velocity stacks
    Worx intake
    R&D pump seal kit (and sealed all joins)
    Solas dynafly 14/20
    Iridium plugs
    Seafoam strong flush treatment

    The gains have been amazing. She will now run a constant 62mph gps in most conditions and full tank and on two occasions has managed over 64, peaking at 64.3 gps in flat calm and 3/4 of a tank. It surely doesnít get much better for these models ?

    Thing is, Iím half way through fitting the riva free flow and occasionally read that this can make a slight difference in combination with the other mods already done.
    Will I even notice any more gains ? Surely unlikely ? I havenít read of this model doing much better than 64 odd gps. Worth noting these speeds were recorded only when I switched on the gps to see for a few minutes out the whole day. Not sure it would have seen much more with less fuel...it started to porpoise a little with the tank low. Also worth noting that this was done in a fresh water lake and not sea water with tides and currents influencing speed. Iím impressed at least, haha.

    Thanks all.


  2. #2

  3. #3
    fx160's Avatar
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    The exhaust will add very little if anything
    I got a max of 65.4 with my 2004 fxho
    I tested a lot of parts to get there
    And also filled all the bolt holes on the ride plate and intake grate
    I shimmed the ride plate to give max speed with slight bounce at top speed

  4. #4
    Quote Originally Posted by fx160 View Post
    The exhaust will add very little if anything
    I got a max of 65.4 with my 2004 fxho
    I tested a lot of parts to get there
    And also filled all the bolt holes on the ride plate and intake grate
    I shimmed the ride plate to give max speed with slight bounce at top speed
    Ah. Thanks for the reply and info. I had thought about filling over the bolts too. Next on the list.
    My ride plate is still standard. Perhaps also on the list.
    One thing I noticed was that my speedo became irratic after the intake and pump seal. Managed to tweak it a bit lower and itís now working. Well as much as they can be expected. Tells a few porky pies occasionally showing 70mph, haha. To be fair, when it hit 64.3 gps it was showing only a few mph over at 66/67 from memory

  5. #5
    fx160's Avatar
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    Yeah once I started playing with the rideplate my speedo was useless
    I played with the stock intake grate smoothing it out
    And gained 1 kph when I first did it
    I also gained by using Kawasaki twin electrode plugs
    I used to ride with a few guys 2 on 15fís 1 on a msx 140
    We were all pretty close on top speed
    And used to race flat out for miles
    Even so much as sitting in the wrong spot on the seat
    Could leave you a couple of ski lengths behind
    We were all constantly testing little things trying to get an edge
    Then someone bought a supercharged ski
    And it all ended
    Speeds are too high now to have the same fun
    It is still fun running over 80 mph though

  6. #6
    Quote Originally Posted by fx160 View Post
    Yeah once I started playing with the rideplate my speedo was useless
    I played with the stock intake grate smoothing it out
    And gained 1 kph when I first did it
    I also gained by using Kawasaki twin electrode plugs
    I used to ride with a few guys 2 on 15fís 1 on a msx 140
    We were all pretty close on top speed
    And used to race flat out for miles
    Even so much as sitting in the wrong spot on the seat
    Could leave you a couple of ski lengths behind
    We were all constantly testing little things trying to get an edge
    Then someone bought a supercharged ski
    And it all ended
    Speeds are too high now to have the same fun
    It is still fun running over 80 mph though
    Thanks very much for the response.

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