I have a briggs & Stratton 675 series engine in a Craftsman front wheel drive rotary mower which won't start. It was fully serviced and used 3 times this season but now it won't start. It keeps trying to backfire. I've checked the carb and cleaned it inside and out, replaced fuel with fresh and cleaned all electrical switches. Battery is fully charged. Cranking the engine produces a spark and there is fuel in the cylinder but still it won't start. I think that somehow the timing has moved. How do I correct this?
If it has hit a object, the flywleel key is partially sheared, and needs to be replaced. they are very inexpensive,CHEAP. this will through the engine out of time just enough it wont start.
SOURCE: B & S 675 series engine timing question
The gear on the crankshaft is 'keyed' and has a dimple on one of the teeth. That dimple aligns with the dimple made into one of the teeth on the camshaft.
I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae
SOURCE: what kind of oil do I use in my 675 series engine
4 stroke synthetic is most likely what you'd want to run if it's a new unit to yourself. Otherwise any 4 stroke motor oil is fine, you can find it at any retailer that sells small engine machinery.
SOURCE: 18hp twin cylinder Briggs & Stratton backfire
Check to see if the carb is clean, if so the anti diesel value could not be working. Apply 12 volts to value and see if it move's. If that works then you may what to check the fuel pump and see if it pumps. After you tried all that then you may have change the main jet size because these engines come with a small jet for the EPA.
SOURCE: I have a Craftsman 2700 psi pressure washer with a
Here is the long answer with everything we learned while using a power
washer twice a day for years::
It sounds like could be one of the problems listed below or a
combination of those things.
1) The exhaust is partially blocked. Check the screen covering exhaust
port for carbon and dirt build-up. High-speed exhaust air must pass
freely. We finally broke the exhaust screen out with a screwdriver to
get our machine going one day.
2) Gas is not flowing freely to carburetor > under gas tank, find the
rubber hose connected to carburetor. Pull off rubber hose and make sure
gas flows freely. You can use this hose to drain gas tank of old gas
... and then put in fresh gas.
3) Carburetor is partially gummed up and engine cuts off when gas flow
slows down. Buy some gum out, and then don't store power washer with
gasoline in the tank. Or put additive in gas when storing machine.
4) The choke is letting in too much gas or not enough gas. Try different
adjustments. The choke-lever on our power washer got so bad that we
could not set throttle at full open or the machine would die. We still
use the machine at 2/3 throttle, and then start it each time using WD-40
as described below.
5) Dirty air filter that won't let engine breath enough air to keep up
with combustion. Take off air filter and see if problem persists.
6) The spark coil is going bad?? Change spark plug to see if problem
persists. Is spark plug wire pushed all the way onto the spark plug?
Now the nitty gritty: we're gonna start that thing right now
7) Take off air filter. Spray WD-40 directly into carburetor. Yes, we
use WD-40 every time to start my power washer, and we use the washer
twice a week.
Spray in the WD-40, Pull the engine cord. The engine will
fire on WD-40. Guaranteed.
Once it starts, keep spraying WD-40 directly into carburetor to keep
engine going.
If engine will not fire and keep going on WD-40, then your spark is
suspect.
If your engine fires and runs on WD-40 but dies without it, then your
gas supply or carburetor are suspect
8) Carburetor problem >>> try Gum out >>> and then
take machine to small engine repair shop
9) Spark ... take out spark plug. Put spark wire back on. Hold spark
plug by spark wire. Touch metal threads of spark plug to metal opening
where plug came out. Metal to metal. Pull back start cord and look for
spark between the metal.
If you have no spark, then spark coil is bad
>>> take machine to small engine repair shop
Let us know how it comes out!!
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