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  1. #1
    Tech Guru Resident Guru
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    About V-Force Reeds

    We often write tech update bulletins for our customers … it gives me no joy at all to write this one.
    We recently did a full buildup of an SXR800 engine for a customer. While we normally use stock reed cages, this customer provided V-Force reed cages that he wanted installed. After assembling the engine, we conducted our standard air-leak test to find that the engine had several catastrophic air-leaks (that means the engine was leaking air out faster than we could pump it in). In short order, we found that the sealing surfaces of the V-Force reed cages (against the inlet manifold) were profoundly “unflat” and they leaked all the way around (even with the supplied gasket and gasket sealer). After disassembly, it was clear that the multiple surfaces on the reed cage were all mismatched, and serious surfacing would be needed. We ended up having to machine about .015” (.38mm) off the collective reed cage surfaces to get “what appeared” to be a flat sealing surface. This surfacing had to be done very carefully because the two reed cage sealing surfaces needed to be square and parallel to reach other in order to seal against the stock “one-piece” inlet manifold. If a well-meaning customer would have just bolted on these same V-Force reed cages, the resulting air leaks would have caused un-ending starting/carburetion/jetting problems, to say nothing of delivering scored pistons every time it got run at extended high-rpms. This is particularly frustrating for us, because any time a customer contacts their dealer (or the manufacturer) for V-Force jetting info, the standard answer is “contact your engine builder”.
    Well ….. This is your engine builder …. And based on our experience, V-Force reed cages do not have “jetting” issues, they have catastrophic air-leak issues that need to be resolved. Given this, we will strongly recommend against the installation of these reeds into our engines. For those that already have V-Force reed cages, we strongly recommend to pressure test your engine before going on one more ride. If you have huge air leaks (as we found), those leaks must be sealed 100% before running your engine. Visit this page for more info on pressure testing your engine. http://www.groupk.com/tec-airleak.htm
    It is our greatest hope that the folks at V-Force see this as an important issue that needs to be immediately addressed … and addresses it. Please find attached some photos that illustrate.
    Respectfully, Harry Klemm Group K

    DSCN2474.JPGDSCN2477.JPGDSCN2479.JPG
    Unless otherwise stated, responses to all forum posts are based on my personal experiences working within the PWC industry, and developing high performance PWCs since 1987.

    www.groupk.com

  2. #2
    PWCToday.com Is My Home Away From Home tshank123's Avatar
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    Re: About V-Force Reeds

    I never liked VF3s. VF2s bolt up to the manifold just like the stock reed cages so you don't need to worry about the mating surface, at least on Yamahas they do. Not only that, VF3 cages are made out of cheap plastic. I hydrolocked an engine once and the entire cage collapsed, I had to replace the whole thing.

    I seriously doubt anyone from Moto Tassinari will notice this. They're a pretty big company and I'm sure the PWC market is small for them.
    Last edited by tshank123; 05-10-2016 at 11:56 AM.
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  3. #3
    Top Dog sea-one's Avatar
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    Re: About V-Force Reeds

    agreed on the VF2
    2004 Rxp Stock Motor with other light mods
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  4. #4

    Re: About V-Force Reeds

    Harry,

    Is this issue a moot point for anyone running reed spacers, or would the same sealing problem remain?
    Last edited by Alter Ego Trip; 05-26-2016 at 07:30 PM.

  5. #5
    PWCToday.com Is My Home Away From Home tshank123's Avatar
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    Re: About V-Force Reeds

    Same problem.
    FN Wealth Management - http://www.fnwealth.net/
    High Speed Industries - TBA
    RIVA Motorsports - http://rivaracing.com/
    Competitive Crankshafts - http://competitivecrankshafts.com/

  6. #6

    Re: About V-Force Reeds

    Quote Originally Posted by tshank123 View Post
    Same problem.
    Well that's not good. Maybe I should return these and replace with the VF2's then. I've never heard anyone else with this issue but it certainly raises a red flag. Maybe it's an isolated incident? I can't imagine Tassinari putting out a product that is that bad.
    Last edited by Alter Ego Trip; 05-27-2016 at 12:49 PM.

  7. #7
    PWCToday.com Is My Home Away From Home tshank123's Avatar
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    Re: About V-Force Reeds

    I don't think people normally run reed spacers with these because they kinda have the spacer built into them. What are you using them on? An SXR?
    FN Wealth Management - http://www.fnwealth.net/
    High Speed Industries - TBA
    RIVA Motorsports - http://rivaracing.com/
    Competitive Crankshafts - http://competitivecrankshafts.com/

  8. #8

    Re: About V-Force Reeds

    Running it on my Seadoo XP 1100 conversion. Guys were having issues with them chipping and coming apart without the spacers. Plus, I needed the extra pulse fitting the spacer provides for the Mikuni 44 carbs going on it.

  9. #9
    Resident Guru bored&stroked's Avatar
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    Re: About V-Force Reeds

    Quote Originally Posted by Alter Ego Trip View Post
    Well that's not good. Maybe I should return these and replace with the VF2's then. I've never heard anyone else with this issue but it certainly raises a red flag. Maybe it's an isolated incident? I can't imagine Tassinari putting out a product that is that bad.
    You could always just check them instead of throwing parts at a maybe problem.
    '90 Superjet: ported 760, dual 44's, B pipe, ADA head 190psi, TDR waterbox, hooker 10-16, sponsons. Girlfriends ride
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  10. #10

    Re: About V-Force Reeds

    Quote Originally Posted by bored&stroked View Post
    You could always just check them instead of throwing parts at a maybe problem.
    What!?! Inconceivable.

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