one of the smartest engineers I know sent me this.  I thought I would bass it on.  Personnally I have used can kroil and aeroKroil (not mentioned in this but it is an arisol version of cankroil) with phenominal success, but it is hard to come by and spendy.  I may mix a homebrew batch and put it in a seal container...
 
Machinist's Workshop Magazine (March/April or May/June, 2007)
actually tested penetrants for break out torque on rusted nuts.
Significant results! They are below, as forwarded by an
ex-student and professional machinist, Bud Baker.

They arranged a subjective test of all the popular penetrants
with the control being the torque required to remove the nut
from a "scientifically rusted" environment.

*Penetrating oil .... Average load*

None ..................... 516 pounds
WD-40 .................. 238 pounds
PB Blaster ............. 214 pounds
Liquid Wrench ..... 127 pounds
Kano Kroil ............ 106 pounds
ATF-Acetone mix....53 pounds

The ATF-Acetone mix was a "home brew" mix of 50 - 50 automatic
transmission fluid and acetone. Note the "home brew" was better
 than any commercial product in this one particular test. Our
local machinist group mixed up a batch, and we all now use it
with equally good results. Note also that "Liquid Wrench" is
about as good as "Kroil" for about 20% of the price

 

I bought it with the head off.I haven't un bolted the cylinder yet.But it don't turn over with the kick starter.I been spraying the piston with liquid wrench for the past week.   I'm going to Walmart and look for thar Kroil oil.            Harbour Frieght for a rubber mallet. --- On Fri, 11/6/09, Crash <mark.baird@dot.pima.gov> wrote: From: Crash <mark.baird@dot.pima.gov> Subject: [MAICOMOTORCYCLES] Re: Heres my latest bike stand To: MAICOMOTORCYCLES@yahoogroups.com Date: Friday, November 6, 2009, 2:16 PM   You took off the head. Does the cylinder come off or is it stuck? --- In MAICOMOTORCYCLES@ yahoogroups. com, Kurt Lund <loosemyshirtkurt@ ...> wrote: > > The cases are empty,should I put the Kohl oil in there or regular oil?I should probly put the head back on and squirt the oil through the spark plug hole?It's at Top dead center.the piston,that is. >  The guy I bought it from thought the bottom end is frozen ,because he pulled it around with a vehicle in gear and it skided all over.I can't fet in gear now. >   Thank you!Greg man!Heres a site you might not been it's not related though,music. > http://jazzfusion. tv/bootlegaudio. 1176.html > > --- On Fri, 11/6/09, Greg McManus <pappadyck@. ..> wrote: > > > From: Greg McManus <pappadyck@. ..> > Subject: Re: [MAICOMOTORCYCLES] Heres my latest bike stand > To: MAICOMOTORCYCLES@ yahoogroups. com > Date: Friday, November 6, 2009, 6:47 AM > > >   > > > > > > > > pull the motor and get the cylinder vertical and try the marvel but i use kroil. keep adding a little ever 15 minutes or so for a couple of hours then give it a try. if it is'nt loose yet use a propane or mapp gas torch, don't use oxy/acetylene unless you are very careful, and heat it to about 250 deg.. this should knock it loose. > > --- On Fri, 11/6/09, Kurt Lund <loosemyshirtkurt@ yahoo.com> wrote: > > > From: Kurt Lund <loosemyshirtkurt@ yahoo.com> > Subject: [MAICOMOTORCYCLES] Heres my latest bike stand > To: MAICOMOTORCYCLES@ yahoogroups. com > Date: Friday, November 6, 2009, 2:05 AM > > >   > > > > > > > gi.ebay.com/ ebaymotors/ ws/eBayISAPI. dll?ViewItem& item=18042915205 9&ssPageName= ADME: B:EF:MOTORS: 1123  >   I picked up that 78 400 it's siezed.How does that marvels mystery oil work? >   I fill the trany up with it and let it sit.Or get a rubber mallet and try beating the cylinder off? >  Cheers,Kurt >