where did the other 2. hp go from previous graph?
Previous is with 490 main and this is with 500 main.
We start Slechten pipe with 500 main (57hp), what i use on tarmack. It's badly too rich on inertia dyno!!! (You can't find best jetting on inertia dyno! It has not enough braking to burning all fuel that you neet on track.)
Then 480 (65hp) and 460 (66hp), which was best of tested. But more smaller can be better, no time. Then MuN-pipe, start 490 (72hp) > 500 (71hp), no other
. Powervalve testing (i quess again) we make with MuN-pipe and 500 main jet.
I remember that "powervalve OFF" mixture was very very rich.
This dynoing happend almost 5 years since and i don't remember all exactly. Some of those difference can be of dynos tolerances. Motor temp and pipe temp (it's most importing), ...
Looks like the exhaust valves are starting to open at 4500RPM's and are fully open at 5500RPM's. There goes my theory of "never half-open"...
When you did these tests, did you increase the rews quick och slowly?
Do you agree with my interpetation?
//John
John, your theory about "never half-open" is right. Please don't shut me, because i don't remember sure. If someone can take cover plastic of cylinder, so that KIPS moving arms is seeing. Raise rpm slovly and check what arms making. I'm so sick than i can't do now that. I last start my KX summer 2004
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This dyno was PekkaP's Fuchs-dyno,
http://www.pekkap.fi/fuchs.htm. That is acceleration, or inertia dyno. Pekka raised rpm slowly to 4000 and then wide open. We dynoing KX only one evening. If you want better results you need own dyno and eat and sleep in dyno room
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Remember: My old -86 KX500 have KIPS only side exhausts, not in main exhaust.
There all rest dyno graphs: