I have a Murray lawnmower with a Briggs and Stratton 6.0 HP engine
that dosen't want to start. I tried new filters, spark plugs, fresh
gas and checked the primer pump. I just pull the cord and nothing
happens. When i had the filter off I noticed that there is a spring
which connects the throttle lever to the carburetor choke plate which
looks pretty worn out. When i move the throttle lever, nothing
happens to the choke plate (although I can move it manually). Could
this be the reason for the thing not starting? Or does anyone else
have any better suggestions?
on 8/24/2007 10:04 AM email@example.com said the following:
Unless you have an automatic choke, the throttle lever does not move the
choke. The choke lever moves the choke plate, whether the engine is
running or not. Perhaps you are flooding the engine. Try a little
starting fluid (or choke cleaner) sprayed into the throttle before starting.
On Aug 24, 10:04 am, firstname.lastname@example.org wrote:
Check for spark. Pull the plug, stuff the wire back on, and lay the
threaded end against a head bolt on the engine. Pull the cord. If it
sparks blue, you've got spark. $20 says you don't have any spark.
Did you hit anything with the blades recently? I don't know if they
still do this, but the flywheel used to have an aluminum key that
would shear if you hit anything too hard. Instead of twisting off the
crankshaft, the flywheel shears the key.
On Fri, 24 Aug 2007 07:04:42 -0700, email@example.com wrote:
Squirt some gas in the carb, open the throttle all the way and pull.
If you can't even get a pop I bet you have no spark. It is usually
easiest to check spark with a helper pulling the cord while you watch.
You can usually just stick a screwdriver in the end of the plug wire,
hold it about 1/4" from the block and have your helprer pull the cord.
You want a hot blue spark. A thready yellow spark is marginal and if
you can't get 1/8" out of it the engine will not start.
These engines have points that can wear down. They may be under a
cover, out where you can get to them but older or cheaper engines have
them under the flywheel.
On Aug 24, 9:04 am, firstname.lastname@example.org wrote:
You might want to take the bowl off the carb. and see if it has any
'crap' in it.
If it does, clean it out, then remove the gas tank and clean it, too.
(this is where the crap accumulates)
This works for me and I hope it will help you.
I know about cars. Enough to do a valve job or change a crankshaft.
Lawnmower carburetors look to me like fine watches. Small precise springs.
Multiple bell cranks. Lots of little things that have to work together as a
I thought I knew enough to fix my own. It's just a carb, right?
Ended up taking it to the shop. The guy said it was a combination of old
gas, crud, and a spring that worked loose.
Fifty bucks later, I'm mowing my lawn instead of fighting a lawnmower carb.
Take it to a reputable shop. If it don't run right, take it back until it
Make sure that they say it's guaranteed to run.
A carb will make it run bad and stall a lot, maybe not even really
ever getting up to speed but if you squirt gas directly in the carb
and it won't run for a second the carb isn't your biggest problem.
That is true of cars too. I have seen guys get an outboard to run long
enough to get back with nothing but a ZEP spray bottle full of gas.
The fuel system was full of salt water.
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