the force motors are bad for the piston coming apart between the two
rings. little chunks will break off and affect the compression.
eventually it will let go and then you are forced to do a rebuild
including boring and piston replacement. if you catch it soon enough
you may get away with just a piston replacement. if you can talk to a
shop that rebuilds outboards they may have an example lying around.


mwaidley wrote:
So would you say from past experiences that this could be a really bad
thing, needing ring replacement, head boring, and all that fun
stuff...or is it sometimes just due to lack of use...a frozen ring?
The boat has been sitting stagnent for some time and i think that may
be all that is wronge. $3k for a 17ft bayliner capri, floor is soft
in 2 places, hull is in good condition. This will be my first boat,
but deffinatly not my first engine. I can handle any repair
necessary...but do you think its worth it?



"JSE" wrote in message ...

There should be no more than 15 psi between all cylinders. Usual compression
is frrom 90-110 psi with 80 psi being the minimum on older engines.


"mwaidley" wrote in message
. com...

Is a range from 120 to 150 a normal top cyl to bottom cyl compression
for a murcury force 120? 30 PSI is a huge range. Before i buy a boat
i thought i would check and see if anyone knew if this was normal or
not? Its a bigger range than i am used to seeing.