Maintenance & Technical > KX500 Original
16t sprocket
alward25:
--- Quote from: stewart on May 18, 2009, 02:15:29 PM ---i thought sidewinder made down to a 38
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That would be funny to have a rear sprocket almost the same size front sprocket.
Polar-Bus:
--- Quote from: jfabmotorsports.com on May 20, 2009, 11:10:57 AM ---
What causes engine braking on a 4 stroke?
Why do 2 strokes and diesels not have it?
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A 4 stroke engine has a much longer and complete compression stroke vs a piston port type 2 stroke. Also the fact that the engine has to turn over 4 times vs. 2 times for every power stroke also causes a lot of stored inertia that takes longer to decellerate. It took me a LONG time to acclimate to hitting jumps with my YZF vs. my 2 stroke. If you slightly "chop" the throttle off the face of a jump with a 4 stroke, the engine braking causes your front end to dip, and then you will most likely be taking a dirt nap.. :(
This is my crude comparasin of 2s vs. 4s, i'm sure there is someone here who can explain the details far more precise than me..
oic0:
As for diesels, this page explains how a jake brake works and why they don't have engine breaking to begin with. http://www.jakebrake.com/products/how-the-jake-brake-works.php
I fail to see how a standard four stroke is different than a diesel though? Maybe both of them have big ol pumping losses, just a diesel is usually pulling a much larger weight so it isn't enough and they need the extra hit from a jake brake?
jfabmotorsports.com:
--- Quote from: DoldGuy on May 20, 2009, 12:18:25 PM ---I will TRY to explain. Imagine going down a straight with an upcoming some what tight left hander, your in fourth or fifth gear with the motor tapped, what do you do, you grab a handful of brakes and MAYBE down shift a gear if it does not cause too much rear wheel hop. This is where the comp release comes into play, you use the downshift (or 2) to come in hot & let the motors gearbox be the Controlled engine braking (which feels much like a current F four stroke) and with a turn left, then right, the rearend steps out smoothly & controlled. If anyone has tried to go fast on an oval before will tell you, you have to be aggresive & smooth to have good lap times. Next time you go riding, try downshifting 2 gears with the clutch out & see how much engine braking is actually in a 2 stroke, it's just not smooth like a 4 stroke. I hope this gives some what of an explanation.
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Thats an awsome explination of why you would want engine braking. Now, how is a compression release going to slow the engine down? Were the slipper clutches designed to get rid of the engine braking that 4 stocks have so that you could use the rear brake with more controle?
slow600:
well i got the traction issue under control this morning. i swear the distanzia's feel d**n near like slicks. every kx owner should get to experience a power wheelie while still coming out of a turn. my 16t front is not here yet, but i almost decided im not gonna use it. i cant bring myself to get rid of the case saver. im waiting on a completion of a pmp 40 tooth rear. hopefully this will keep me in the "meat" of the power for longer.
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