VFORCE3 REEDS by MOTO TASSINARI

[KR-1R]

VFORCE3 REEDS by MOTO TASSINARI
review of KDX200 reeds (part V313)

Recommended retail value US$150 (US$300 pair)
Kawasaki OEM parts 12021-1072 KR-1/S ?available? approx 150euro
Kawasaki OEM parts 12021-1095 KDX200 '90 onwards approx US$110

OEM reed block assembly
Genuine Kawasaki part 12021-1072 (2 x 3 petal) carbon fibre



Unfortunately finding VForce images specifically relating to the actual model you want to buy are few...
this makes confirming selection for hybrid applications difficult (if one bike might fit another)
...you won''t know if there will be 12 petals or 8, reed stops or not.
if they made the effort they would sell a truck load more I'm surei]
Below is V313 reed assembly for KDX200/250 (supplied with 2 gaskets, instructions and sticker(s) and limited warranty)



Unlike some models from Moto Tassinari that are 12 petal designs (4 x 3 config) - the KDX version is 4 x 2.
Some models do feature reed stops - the KDX ones don't
Probably not required given there is may be flex less in a 4 reed block versus 2 reed (OEM).
The screwless petal retension mechanism is clever.
Each reed assembly consists of 4 parts - reeds, reed cage, block flange (doubles as petal retainer) and stuffer/flow guide block



Carbon Fibre reed petals - indications of mechanical cutting process or die punch cutting to form/shape petal edges.
The edges have very light burr to them towards one direction - maybe the stamping process contributes to edge tension on the petal that causes minor seating problems.
Would waterjet or laser cutting process have left a cleaner edge?
[imghttp://kr-1r.com/kr1s/vforce/petals.jpg[/img]


Have you seen the light? Notice the edge gaps - I expect zero in a NEW reed block
Poor quality tolerance on this particlar plastic casting (ebay factory second?) not helping edge seal on this particular corner.
If you place your mouth to the reeds (like a harmonica) and try to blow backwards through them,
they do seem to seal the flow adequately (except the one particular corner which has minor loss)



KDX specific cente offset
No fault in product here. The intake on the KDX features a slightly bent manifold and entry into the reed block is offset to left side (servicing MX carb from left side of bike).
This will require some fettling/filing to cente passage for use on KR-1/S - or take two KDX Air Guides, cut up in halves and make one single one out of two and take a mold and recast new centred versions

High quality reinforced polymers look like the part and create a dense hard plastic - the three major parts fit together tightly.


Sealing isnt always an issue on reeds because in the crankcase positive pressure seals the petals against the cages.
Maybe alot of the edge sealing gaps will disappear after some bedding in with use - I think the corner problem is fault with this set.
The fault can be sanded out with 1200 wet and dry and tweaked for perfect seal.

...quite frankly materials are very nice, the design and ease of replacement is elegant - but the quality control lowers the the rating of the product.
If you get a matched set they do represent good value, because as a high tech aftermarket part they arent much more expensive than if - at some stage you will - have to replace the Kawasaki reeds

other ways to spend or save money...
standard KHI part is around 25% cheaper..
PWK35 carb upgrade US$175 each (US$350 pair)
aftermarket pipes &400 pair

http://www.mototassinari.com/
see their FAQ page...

[i]Q.) When I hold the reed valve assembly up to a light source I notice there is a slight gap at the reed tip area. Is this small gap going to affect performance and is this a problem?

A.) This is absolutely not a problem and will not affect performance in any way. When you consider the reed petals are opening and closing 133 times per second at 8¸000 RPM, the petal will never actually fully seal 100%, so a small gap is not a concern.

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V-Force VFORCE3 V-Force3 VForce

other models compatible with KR-1, KR-1S may use the same gasket as the KDX...
KX 125 93-00 part V2M03 petal 2P090-1 gasket G03
KX 125 2001-02 part V2M03A petal 2P090-1 gasket G03
KDX 200/220 ALL part V313A petal 3P682M gasket G03
the KDX is offset entry so air guides/stuffer requires modifications
perhaps the KX models have a central stuffer hole????
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(.)(.) B1,C2,C3A,D1

[the-elf]

I run V force 3 reeds in combination with PWK 35mm carbs as does MJ. From experience I can say:

I have noticed a slight gap as well on some of mine but this dosn't appear to be a problem, so I'm guessing the positive pressure is forcing them close. the gaps on mine appear like the reed below the one in the photo with the poor plastic casting. I've not noticed any major imperfections like the one on the top reed with mine.

The best reason for fitting these is that the stuffer block is easily modified to the correct diameter for the 35mm larger carb rubber mounts.

I've never tried a back to back dyno run between the original reeds and the V force as I don't have any original KR1R reed block stuffers. I'll leave this for someone else to try.
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-- Lets go Racing
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[TwoStroke Institute]

A V-Force will typicaly show a 0.5-1HP gain through the range on an 85cc and 1.5-2HP on a 125.By far the best bolt on HP you can get, as they don't add in one part of the range and take from somewhere else.
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crochet & croquet

[KwakOn]

these are listed for the KR1S at

http://www.mxpower.org.uk/vforce.html

VForce3 Valves road & race

MINARELLI 50CC ALL : £106.38 MINARELLI 65CC & ABOVE : £106.38 POLINI 40/50CC : £106.38 POLINI 65CC & ABOVE : £106.38 PIAGGIO 50CC ALL : £106.38 PIAGGIO 65CC & ABOVE : £106.38 APRILIA RS50 ALL YRS : £106.38 APRILIA RS125 ALL YRS : £106.38 CAGIVA 125CC ALL : £106.38 h***a RS125 ALL : £106.38 YAMAHA RD/TDM 250/350 : £106.38 KAWASAKI KR1S 250 ALL : £106.38

looking like £250ish

someday, along with Lomas pipes (and porting), 35mm PWK's and Zeeltronic.
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