Maintenance & Technical > KX500 Original
premix ratio
Motorrad:
wondered how that would go over :lol: :lol:
40:1 that I run still scares the crap out of me.. :|
And going from 40 to 50 is a loss of 20% oil.. Lots don't calculate percentage change between these ratio numbers...
Think my math is right 16oz to 5 gal is 40. 12.8 to 50.. 16-12.8=3.2
16 X x = 3.2. 3.2/16=0.2. So. 20%
Also incase you were curious. It's 36% less oil than the 32:1 that the kaw manual wants
That's a big percentage..
Motorrad:
http://www.maximausa.com/tech-tips/oil-migration.php
Polar-Bus:
--- Quote from: bige on January 06, 2012, 12:09:15 PM ---is anyone running a premix ratio of 50:1? i know ktm recomends this in a 250cc-300cc
--- End quote ---
A lot of woods racers will run 50:1, as woods bikes see far lighter engine loads. Most casual riders run around 40:1 . Run anything but 32:1 unless your engine see consistant heavy loading and higher rpm's . My CR125 shifter kart spends 80% of it's time out on the track at 12,300 rpm's and I prudently run 24:1 :-o
bige:
20% less oil sounds scary to me. i have always mixed at 32:1in my 250 yz but was figuring that might be a little to much oil in a 500 but you cant go wrong with excess oil. i ride single track and trails so it dont get run hard, just wished there were some mx tracks here where i live.
Motorrad:
Husqvarna did some testing in the mid 70's that was very interesting. They put 3 identical stock engines on a dyno and ran them for several days at varying RPM and load conditions. Then both motors were torn down and inspected. The engine running CASTOR based oil had the least wear, followed by the synthetic oil, and finally the engine running standard 2-cycle oil.
A second test they performed was to run synthetic in 2 identical engines and one was run at 24:1, the other was run at 50:1 The engine that ran 24:1 had less piston skirt wear, and less rod bearing wear, but had the same main roller bearing wear as the engine run at 50:1.
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