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  1. #1

    Stock Velocity Stacks

    Is it safe to remove the stock "metal flame arrestors" inside the stock throttle body stacks, and run the engine like that with the stock air filter??? I see that the ones Riva sell are the same but color blue and all open without the metal inserts.


  2. #2
    cheatin' piston popper addicted's Avatar
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    i don't see why not, but the r&d stacks are only around $40.

  3. #3
    YoYamma's Avatar
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    Quote Originally Posted by FX_HO_160 View Post
    Is it safe to remove the stock "metal flame arrestors" inside the stock throttle body stacks, and run the engine like that with the stock air filter??? I see that the ones Riva sell are the same but color blue and all open without the metal inserts.
    I had that Riva kit on our old FX-140's...
    as I recall, the kit ships with a special power filter that doubles as a replacement flame arrestor; part no. RY1325, see here:
    http://www.rivayamaha.com/pwc_perf_p...140_rpmkit.asp

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    davidw's Avatar
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    Quote Originally Posted by FX_HO_160 View Post
    Is it safe to remove the stock "metal flame arrestors" inside the stock throttle body stacks, and run the engine like that with the stock air filter??? I see that the ones Riva sell are the same but color blue and all open without the metal inserts.
    I think with no stacks or TB's you could tear the stock filter open if you get a backfire. I wouldnt do it. I have the Riva stacks with the K/N Riva filter. From what I read, the r/d stacks come off pretty easily. The riva's are screwed in and will not come off. $120.00 i think .... I know 2 ppl that replaced the r/d with the Riva's

  5. #5
    jamiggs's Avatar
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    Velocity Stacks

    Quote Originally Posted by davidw View Post
    Quote Originally Posted by FX_HO_160 View Post
    Is it safe to remove the stock "metal flame arrestors" inside the stock throttle body stacks, and run the engine like that with the stock air filter??? I see that the ones Riva sell are the same but color blue and all open without the metal inserts.
    I think with no stacks or TB's you could tear the stock filter open if you get a backfire. I wouldnt do it. I have the Riva stacks with the K/N Riva filter. From what I read, the r/d stacks come off pretty easily. The riva's are screwed in and will not come off. $120.00 i think .... I know 2 ppl that replaced the r/d with the Riva's
    I have just noticed my 2005 FX Cruiser HO has the K/N Riva filter (probably put in by the previous owner) but the stock flame arrestors are still there. I have been riding this for 2 sesons now, am I doing any damge to my engine? Would I get the same result of stacks falling off if I use the R/D stacks on my engine? Has anyone used the R/D Velocity Stacks on FX Cruiser HO?

  6. #6

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    I have the R&D velocity stacks on my 2006 fx ho with the R&D air filter and they work great. The R&D stacks mount super easy and they haven't fallen off or gotten loose after 30 hours. I'd definitely recommend the R&D stacks for the price.

  7. #7
    Take the time to smile sirbreaksalot's Avatar
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    yes you can just remove the inner honey comb material from the OEM stacks, then u end up with the same as the RIVA alloy stacks , did this to my next door neighbors ski because he was to tight to buy the alloy ones like I did for my 2005 ho,
    we did the same exhaust mod and prop , and their was NO difference in performance ,he just saved some money !

    Dont worry about backfires on EFI engines , they dont suffer the same as the carby engines do.

    Waz

  8. #8
    Quote Originally Posted by sbaird4000 View Post
    I have the R&D velocity stacks on my 2006 fx ho with the R&D air filter and they work great. The R&D stacks mount super easy and they haven't fallen off or gotten loose after 30 hours. I'd definitely recommend the R&D stacks for the price.
    Me too! R&D is the most cost effective choice and easier to install than RIVA.

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