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Author Topic: What is Moly  (Read 1015 times)
ragincajun
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Posts: 395

Atascocita, TX


« on: November 23, 2012, 05:52:24 AM »

Might be a stupid question but what is moly oil?  Saw it mentioned in a Valk article yesterday. Should it be used or not?  The article said not to use it in one spot. But hen it appeared that it was suggested in another spot.
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VRCC Member #34758
Hoser
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child of the sixties VRCC 17899

Auburn, Kansas


« Reply #1 on: November 23, 2012, 06:15:26 AM »

No moly in the crankcase, small amount of moly grease on the final drive, Moly oil makes the clutch slip.  Oil containers show non moly with a label on the container with the bottom half blank.  No energy saving oil!  Honda recommends 10-40w oil, as far as I know 10-40w and higher has no moly. I use 15-50w Mobil 1 engine oil.  Hoser
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I don't want a pickle, just wanna ride my motor sickle

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RP#62
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Gilbert, AZ


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« Reply #2 on: November 23, 2012, 06:57:03 AM »

Molybdenum Disulfide.  Its a slippery substance similar to graphite.  Its used in grease for extreme pressure applications and as an oil additive.  Too high a concentration in oil will screw up a wet clutch.

-RP
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hubcapsc
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upstate

South Carolina


« Reply #3 on: November 23, 2012, 07:00:25 AM »


The service manual (http://valkyrienorway.com/download.html here's a copy if you don't have one)
sez to use "moly paste" some places, "moly grease" some other places, and "regular grease" some
other places, all these places are in the final drive line...

Don't confuse one for the other, moly paste sux in your (my  Embarrassed ) pinion cup...  coolsmiley

-Mike
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98valk
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South Jersey


« Reply #4 on: November 23, 2012, 07:01:10 AM »

No moly in the crankcase, small amount of moly grease on the final drive, Moly oil makes the clutch slip.  Oil containers show non moly with a label on the container with the bottom half blank.  No energy saving oil!  Honda recommends 10-40w oil, as far as I know 10-40w and higher has no moly. I use 15-50w Mobil 1 engine oil.  Hoser


moly only makes the clutch slip and mainly the starter clutch and   then trans clutch is just starting too when the PPM is at 500 and above and at elevated oil temps above 80C, at 100 to 200 ppm slippage was not observed and actually the friction coefficient went up slightly when temps where at 100-130C. the automatic centrifugal clutches slip the most with even low ppm of moly. SAE paper 961217 is where the above is from.

so only oils with higher than 200ppm of moly should be avoided according the SAE report.

most motorcycle oils have moly in them including the mobil 1 m/c oils last time I checked they were about 100 ppm. a lot of the diesel oils being used in m/c have moly in them. even honda has a moly oil recomended for their engines.
See www.bobistheoilguy.com oil analysis sections.
friction modifiers are the thing to avoid.
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1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp

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