kdx power valves
awin...@my-dejanews.com
told that when the gear is turned counter-clockwise, all valves should be
closed, the manual is very unclear on this, do they mean that the valves
should be closed when looking through the exhaust port, or through the kips
cover on the left side of cylinder?
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Paul Barry
awin...@my-dejanews.com wrote in message
<7g4aa3$jb8$1...@nnrp1.dejanews.com>...
>does anyone know the proper timing on the power valves on the kdx 220, i'm
>told that when the gear is turned counter-clockwise, all valves should be
>closed, the manual is very unclear on this, do they mean that the valves
>should be closed when looking through the exhaust port, or through the kips
>cover on the left side of cylinder?
>
I just did my KDX200. The person I bought it from had assembled it wrong
after putting in a new top end - so that the valve was always open. On my
first ride on it there was no low end (predictably). It sucked big time.
Now it's fixed and it's terrific :-) - lots of low end and much quieter.
At low speed (or stop) the port between the KIPS cover and the exhaust port
should be open. If you have the pipe off, you should be able to see the
open port. Also if the pipe's off, and you look in the exhaust port, you
can see the exhaust valve extended down from the "roof" of the exhaust port.
I'm not sure which gear you mean should be counterclockwise, but I believe
it's the one on the right side of the shaft which runs across the front of
the engine. That small gear on the right side is under a small cover and is
activated by a "toothed plate". That small plate is attached to an actuator
shaft which runs from inside the engine case and rotates as speed increases.
The gear you mentioned should be counterclockwise at stop or low speed.
This closes the resonator port and the auxiliary exhaust ports and lowers
the main exhaust valve.
As speed increases the "toothed plate" will rotate the gear clockwise and
open the auxiliary exhaust ports, lower the main exhaust valve and open the
pathway to the resonator cavity (under the KIPS cover). You should be able
to rotate the "toothed plate" on the actuator shaft by hand and see the
valves operate if you have the KIPS cover and pipe off.
Sorry for the long answer - hope it helps and is not too confusing.
Paul Barry
96KDX200
Paul Barry
morning brain fade). I should have said :
... at low speeds, the resonator cavity is OPEN (not closed as in my earlier
description), the auxiliary exhaust ports are closed and the main exhaust
valve is lowered.
and,
... as speed increases the "toothed plate" will rotate the gear clockwise
and
open the auxiliary exhaust ports, RAISE/OPEN the main exhaust valve and
CLOSE the
pathway to the resonator cavity (under the KIPS cover).
Sorry about that ... I'll stick to reading and let the experts answer the
questions from now on ... :-)
Paul Barry
awin...@my-dejanews.com
> thanks for the post on the power valve, i sent the cylinder, head, and carb
to fredette, got the stuff back and slapped it together, assuming that if the
valve came from fredette this way, then that's the way it goes, and i'm not
fucking with it...unfortunetly the valve must have "jumped timing" in
shipping, and after putting everything back together, and expecting to shred
all day on sat, was forced to put it back in the basement, tear it down and
figure out what i fucked up.....(absolutely no low end power)...after
examining it for about an hour i figured that when looking in through the
exhaust port, the valves should be closed, and the center "flapper" should be
down, so i got ballsy, and put it back together, (2nd new head gasket $20),
then came to work, and read your first post, and was about to cry....good
thing i read the second post, i was about to trade it in for a
husaberg....thanks for the info, I am propably gonna keep the kdx, and get
the husaberg, I doubt i will ever get a better "woods bike" than the kdx, but
I want to try a four stroke.
Andy
98 kdx220
95 kx250
99 (husaberg? KTM? cannondale?......honda???)
awin...@my-dejanews.com
down, and the side valves are closed at idle, putting it back together, still
no bottom end, lots of top...I'm thinking i must still have the valves wrong,
cause there was more bottom before i took it apart. at this point, it's a well
handling, sewing machine powered scooter.....anybody have any suggestions?
Hal Voges
awin...@my-dejanews.com wrote in message
<7gk8rn$tep$1...@nnrp1.dejanews.com>...
>> well, after taking it apart, adjusting the valves so that the
flapper is
>down, and the side valves are closed at idle, putting it back
together, still
>no bottom end, lots of top...I'm thinking i must still have the
valves wrong,
>cause there was more bottom before i took it apart. at this
point, it's a well
>handling, sewing machine powered scooter.....anybody have any
suggestions?
Here are a couple:
1) Did you read the Kawi Service manual? I have one for my '94
KDX200 and it goes over how to align the Power Valves. All the
valves have punch marks for alignment purposes. The only
confusing part is that the manual doesn't really cover the main
valve. If you don't have a manual I would suggest getting one
ASAP. Also, I can look at mine and try to post what they say.
However, I remember there being pictures that were worth looking
at. BTW, for the main valve, I think as you put the actuator rod
in, the first tooth of the rod has to align with the first grove
of the main valve.
Also, if you really think you have the valves on correctly, you
may have reversed the left and the right valve. One of them has
grove on the top. I don't remember which, but it is described in
the manual. If you are reading the manual, remember, left and
right is from a sitting on the motorcycle perspective.
2) Call Jeff Fredette and ask him how to align them.
3) Take it to your local Kawi shop ask them to show you how to
align them. It may cost a couple dollars but if you take good
notes you should be able to do it yourself the next time.
Hope this helps and let me know if you need more info.
Hal