Maintenance & Technical > KX500 Original
a working compresion release is here
jfabmotorsports.com:
I toyed with the idea of welding a boss onto the head just as we have done with the 10mm x 1mm valves, only toward the rear of the head. I chose the stud mounted version because of less modification to the head. Also, if you decide that you do not like, no longer need it or want to sell the bike with out it, just remove the valve and put a nut back on the stud.
I already have plans to minichureize the valve that I use in an effort to maximize mounting locations...and to cut out the middle man.
JFAB
BullKaw:
--- Quote from: Larry Wiechman on October 31, 2009, 10:09:36 AM ---Long ago, these cable operated valves were used on 2-stroke flattrackers as an engine brake. Run up to the corner, pull the lever and flick'er in. Made for nice, easy slides and a cool farting noise as the valve bled off cylinder pressure.
Larry
--- End quote ---
I don't want to hijack this topic but this is the second or therd time that I have read this. I do not understand how releasing the pressure from the cylinder will slow the engine. Someone has compared it to a Jake Break. A Jake Break releases the preasure just befor TDC after the resistance of compressing the intake stroke has taken place. With the pressure dumped at TDC there is no pressure to rebound the piston and the engine slows.
I know it is done and it must work but I would like to know how.
Friar-Tuck:
BKaw,
The application here is primarily to make the bike easier to start.
As I see it, You are correct in that this is not an "Engine Brake", but merely an additional application.
The force of the piston pushing all that air out of the small passage in the valve will create some resistance.
If I'm not mistaken Jake Brakes "are designed" to use engine compression to aid in vehicle braking, not aid in starting.
Hope I didn't just make this any more confusing...
Tuck\o/
Larry Wiechman:
--- Quote from: jfabmotorsports.com on October 31, 2009, 12:28:11 PM --- Also, if you decide that you do not like, no longer need it or want to sell the bike with out it, just remove the valve and put a nut back on the stud.
JFAB
--- End quote ---
Do you really believe someone would not like, need or want a decompression device after having used one. Can you think of a better resale feature?
I think the future is something like this concept patented by a Husky engineer.http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=6,253,723.PN.&OS=PN/6,253,723&RS=PN/6,253,723
Small, automatic and simple.
Larry
jfabmotorsports.com:
--- Quote from: Larry Wiechman on October 31, 2009, 02:23:54 PM ---
--- Quote from: jfabmotorsports.com on October 31, 2009, 12:28:11 PM --- Also, if you decide that you do not like, no longer need it or want to sell the bike with out it, just remove the valve and put a nut back on the stud.
JFAB
--- End quote ---
Do you really believe someone would not like, need or want a decompression device after having used one. Can you think of a better resale feature?
Larry
--- End quote ---
Larry you are right. I had not looked at it in that way. I can't imagine not having decompression valves now that I have them.
JFAB
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