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  1. #1

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    Install Riva filters on GPR1200. Yes or No??

    Hi
    Ive been told not to put Riva flame arrestors with outerwares on a stock GPR1200 engine as the engine will run lean in the midrange on a constant throttle.
    Can anyone advise me if this is true and if not what mods have to be done including jetting to make them work reliably.
    Thanks


  2. #2
    RIVA CREW's Avatar
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    It's ok to install the filters so long as the catalytic converter was removed. If it's still in use you will absolutely fry the center cylinder from all the heat the cat/con puts off which is sucked into the center carb. Unless you've heavily modified your engine you shouldn't need to rejet. Only adjust the air/fuel mixture screws. To do so you will need to remove the brass "tamper caps" that are pressed into the carbs over the screws. There's a high and a low. Drill out the tamper caps being careful not to ram the drill bit through them. The head of the adjustment screw is just below the caps.

  3. #3

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    Thanks Riva Crew
    They don't put cats in Aussie delivered skis.
    Any suggestions on how many turns on the screws and whether one cylinder will be a different settings to another?
    Thanks for the reply

  4. #4
    RIVA CREW's Avatar
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    Didn't realize you are down under! Before making any adjustments document the original settings. Count the number of revolutions it takes to tighten (close) them. Don't torque them down. You only need to lightly seat them. For a stock engine typically 1-1/4~1-1/2 turn out on the highs and 7/8~1 turn out on the lows. Those are starting points only and should be verified using an aftermarket tach and checking the plugs.

    While you have the carbs off you might want to consider replacing the stock mixture screws with our EZ Tune Kit. The stock screws require a fairly unique screw driver and the low's are on the underside making them extremely difficult to adjust in the craft. Our EZ Tune Kit screws have extended 'T' handles making them much easier to adjust.

  5. #5
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by kpracing12 View Post
    Hi
    Ive been told not to put Riva flame arrestors with outerwares on a stock GPR1200 engine as the engine will run lean in the midrange on a constant throttle.
    Can anyone advise me if this is true and if not what mods have to be done including jetting to make them work reliably.
    Thanks
    I would definitely recommend re-jetting and bigger needles/seats

  6. #6
    improvised tmg97gp's Avatar
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    Quote Originally Posted by WFO View Post
    Quote Originally Posted by kpracing12 View Post
    Hi
    Ive been told not to put Riva flame arrestors with outerwares on a stock GPR1200 engine as the engine will run lean in the midrange on a constant throttle.
    Can anyone advise me if this is true and if not what mods have to be done including jetting to make them work reliably.
    Thanks
    I would definitely recommend re-jetting and bigger needles/seats
    +2

  7. #7
    Mongoose's Avatar
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    Quote Originally Posted by tmg97gp View Post
    Quote Originally Posted by WFO View Post
    Quote Originally Posted by kpracing12 View Post
    Hi
    Ive been told not to put Riva flame arrestors with outerwares on a stock GPR1200 engine as the engine will run lean in the midrange on a constant throttle.
    Can anyone advise me if this is true and if not what mods have to be done including jetting to make them work reliably.
    Thanks
    I would definitely recommend re-jetting and bigger needles/seats
    +2
    +3! --that 3/4 throttle lean seize will get you!

  8. #8
    improvised tmg97gp's Avatar
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    The search button is your friend.

  9. #9

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    ?????????????????????????? Search button

  10. #10
    RIVA CREW's Avatar
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    Upper right area of the page.
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