The best oil you can get for your Lawn Boy is the little 8 oz cans labeled
Lawn Boy! Buy the factory oil and don't worry about it! If you maintain the
engine properly, clean the air filter and use the OEM oil it will live
longer than you want! Do not use any thing else! After all, how much oil do
you use in a year? 1-2 cans??
Mobil, Yamaha and others have synthetic, and yes synthetic is better
than Lawn boy oil , my Evenrude lets me use a leaner mix with synthetic
as do many manufactures state this. Lawn boy just isnt on the bandwagon
yet, synthetics have proven less wear, with an aluminum cilinder this
Too bad Lawn Boy uses a cast iron cylinder!
I am not going to argue if synthetics are better or not, all I know is a
properly maintained engine running regular oil will run for years. I am not
sure it is worth the extra expense. Lawn Boy's oil is a good dino oil. Good
enough that the mower will run until the rest of it falls apart first.
You are right, the mower is 25 years old, runs well, and I am just
thinking of rebuilding it because I want to, not because it is
absolutely necessary. The crank is slightly bent and if I can find a
new crank this winter then I will put it in there. I need to decide
if replacing the rings is worth my time.
Lawn boy oil has gotten me 25 years of service from this mower, I am
not knocking it at all. Personnally I think synthetic is better oil,
and I would use synthetic if I knew where to find it, etc., I run
synthetic in my cars now because they seem to do so well.
Have you looked for a short block instead of rebuilding? I don't know if
they are available for that age of mower, but IIRC they were not that
expensive. Also check around, somebody locally should have some junked out
mowers laying around you could scavenge parts from.
Does LB make any mower engines anymore? On the website all the models
listed are powered by Briggs, Tecumseh or Honda. Seems like the only place
you find the Duraforce (their updated reduced emission 2-stroke) engine is
on the snowthrower.
I was never a big fan of 2-stroke mowers but I always liked that smooth hum
from double the power strokes.
OT but when did Sears abandon Tecumseh for Briggs?
Lawn Boy dumped the 2-cycle engine in just the last year or so. EPA regs are
tough on 2-cycle engines. IIRC, the Republik of Kalifornia does not allow
them any more.
Personally I love the LB 2-cycle engine. Low maintenance, no oil to change.
In the spring, sharpen the blade, clean the filter and go.
Sears has used B&S for years, even while using Tecumseh engines, but
Tecumseh was their primary engine supplier. I believe Sears still uses
either, depending on the equipment.
I may be interested in going the OS piston/rings route, depending
upon my conversation with the machine shop later this morning. I
think if I can get it bored for under $50.00 I may go through with it
just for the fun of it. Could you help me find the os piston and
rings? I dont know a darn thing about sizing, and I dont want to have
to rely on the guys in the shop, they may not have a clue.
On Sun, 20 Nov 2005 09:27:54 -0500, email@example.com wrote:
im not blowin smoke, i been engine machinist since 1973. it is aluminum
jug with cast iron cylinder liner. ive rerung and rebored many. parts
arent much,just your time maybe,or lack of skill.
If you have re-bored & re-rung many Lawn Boy's, where do you get the piston
and rings? Lawn Boy does not offer them! Not for Lawn Boy's own two cycle
engine anyway. Newer ones that come with a Briggs or Tecumseh you can get OS
Well I got a lack of skill in reaming a cylinder for sure. If you
were my neighbor I would try this on my mower, but I am not sure what
re-boring/re-reaming my cylinder will cost. If its over $40.00 for
boring and for new piston and rings, well, I would have to consider
the option. Do you know where I could get a quality boring on this
cylinder in the columbus ohio area?
Should I consider NAPA for the re-boring? Where can I get the OS
piston and rings?
On Sun, 20 Nov 2005 15:20:21 -0500, firstname.lastname@example.org wrote:
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