Maintenance & Technical > KX500 Original
Exhaust valve timing..?
John:
YUNGGUNNAZ,
Have you done any Dyno tests? I just read that you were planning to do some tests. Just asking...
//John
YUNGGUNNAZ:
john,waiting for new o2 sensor to come in.and hopefully weather won't change on that day.(live in the country 25 mi. away from dyno.)will post as soon as done.i'm going to try to post pic's of two cylinders tomorrow just for discussion.
gowen:
I've kept out of this thread because I've tried all kinds of kips timings, holding it open, shutting it, trying to space it a little, ect. I've really found very little effect in port timings with the KIPS and feel there is little benefit to doing major modifications to it. Stock is best that I've found and according to MUN it looks like it is pretty tuned off the bat. Now what can go wrong is your powervalves stuck or clogged with spooge or just crap from excess oil. Also your govenor spring worn out. Preventing it from opening or closing correctly. Those are the only issues I've found. I guess it depends on where you are looking for power. I'm questing for a spike, explosion type power while most are looking to smooth it down.. If this is the case (smooth power) I am of no help.. :-D
I would like to see HP differences with the pipes and valves. I've done my own little dynos, but that was quite some time ago and am due for another one soon (when it is warm enough to pull the bikes out and fire them up).
doordie:
I have measured with my tachometer that KIPS start opening about 4800rpm
and half open about 5000 and full open at 5300rpm,just wanna share info. :wink:
Most of our engines delivery most torque at 5500 rpm and hp at 6500 rpm and signing of at 7000 rpm.
This make you wonder if you change this ramp to......!!! :evil:
//doordie
redlined_KX500:
I just pulled the cylinder on my 97 K5. The K.I.P.S. valve on main exhaust port looks like it's not at max height with rod pulled out. Also seems to be excessive slack in the mechanism.
Should the valve be even with cylinder at top? Not sure if I should try and tighten up mechanism or maybe just de-carbon everything, grind the valve till it's flush and go with it.
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