I have no clue as to the actual solution, but what I would do is disassemble the carb and clean it out. Had a similar issue with a honda motor; ended up buying a new carb off an auction online for $45. Take lots of pics as you remove stuff or find an online parts catalog with a parts blowout diagram.
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How about a little more info? These are pretty simple engines. Checking the spark is straightforward, so that can be taken as a given. How do you know the engine cylinder is getting gas? As a test, do both of the following. Buy a can of 'engine start' spray remove the spark plug and spay a tiny bit right into the spark plug hole and very QUICKLY replace the spark plug and pull the engine start cord. If the engine hits for a moment, then the spark lit the ether just squirted in. - You have spark that will run the engine. Then remove the air filter off of the carburetor and holding the exposed choke butterfly valve open spray some more of the engine start fluid into the carb, while directing the spray into the engine.Spray a goodly amount in (spray for 10 seconds or so). Then quickly release the vale (allowing it to close), try starting the engine. If the engine starts and then runs for a few seconds before dying, then all is fine with the engine proper. The source of the problem lays with the carburetor and mostly likely being either a stuck stuck bowl float (regulates the amount of gasoline getting into the carb or plugged venturi channels that feed the fuel from the bowl to where you initially sprayed the engine start fluid. With that problem assumed, then do one of the following: !) Replace the carb with a new one (most expensive). 2) Remove the carb, take any other coverings off (look for where things are screwed in or held by a bolt, etc) and soak in a bowl of automotive carburetor cleaner that is available at any car care or hardware store for several hours. Reassemble and reattach to the engine, including any linkages that had to be detached when removing the carburetor from the engine. Linkages can be tricky; therefore, it is best to take a digital picture of how they were attached before removing the carburetor. You will have this to refer to when hooking them back up. This is the cheapest solution and will work most of the time. $4-$6 of carb cleaner, as opposed to $50-$75 or so for a new replacement carb. Most of the time a carb fails is because the engine was improperly stored over the winter. NEVER leave gasoline in its tank for such engines when storing. The gasoline turns into a sticky gunk (you cannot see this) that plugs everything up. To totally avoid this, simply run the engine until it runs out of gas before not planning to restart it in a month or two. Doing this will completely avoid this hassle with what was a once a perfectly good mower.
Is the choke staying on perhaps? check spark and plug check airflow, get compression test maybe the oil/compression rings giving way... sounds like its getting hot and increasing fuel flow for some reason??? perhaps clean carb with some cleaner while running (remove air cleaner) spray directly into carby while running run at full throttle as you spray it will try and die ... relax on the spraying and see how it goes.. check air cleaner for blockages as the same time :) hope you get it working!
It's flooded like you say.
If it's really flooded, you'll have to remove plugs and dry them off.
Now when you crank engine, hold gas pedal to floor.
That will stop gas from spraying into engine.
You need to get the gas out of the engine for it to start.
Crank for 20-30 seconds with pedal to floor. Do this 3 times waiting 2-3 minutes inbetween cranks.
The starter needs to cool down.
Then after that start normally and see if it will start.
Remember if it will not start after 2 attempts, then the possiblity of it flooding is there and you'll have to clear out the gas by holding the pedal to the floor again.
First put a nail in the plug boot and hold it close to the engine and crank it over to see if you have spark to the plug, if you do, pull the spark plug out and see if it's wet. If the plug is dry put about a teaspoon of gas in the plug hole and put it back together, it should run for a few seconds. If it does that you have a fuel supply problem. It may have a fuel shutoff valve inoperative, or a carburetor problem. If you have no spark to start with and the plug is wet with gas, you have an ignition problem. If the exhaust smells like gas you are probably getting lots of fuel, but the spark plug can tell us lots of things. A new spark plug probably won't hurt either. Jordan
1.) put aside about $50 that you are ging to spend... period
2.) drain the oil and remove the old oil filter
3.) install a new oil filter, add new 30W oil
4.) remove all 8 spark plug wire from the 8 spark plugs
5.) remove the 8 spark plugs
6.) spray about 5 seconds of WD40 into each of 8 spark plug holes
7.) spray the remainder of the can into each of the 2 valve covers thru the EGR holes (pull out the EGR valve first)
8.) making certain that you have a full battery charge, turn the starter switch to START for about 5 seconds... if your engine turns then your internals are not frozen... that's good
9.) open another can of WD40 and spray equal amounts into ecah of 8 spark plug holes a second time
10.) turn the start switch on for another 5 seconds and listen for strange sounds... by the way without the spark plugs the engine will rotate more quickly than you normally expect... not a problem because as it turns it is lubricating your internal parts
11.) wait a minute and then turn it on for for about 10-20 seconds while listening for scraping or knocking sounds... if none heard then you are all lubed up and ready to reinstall the spark plugs.
Install new plugs or sandpaper the old with the correct gap ( I believe .035")
12.) if you didn't mark the plug wires not a problem... Google '78 Chevy Distributor Firing Order to find terminal #1 on the distributor cap... usually about the 1 o'clock position
13.) install #1 wire to #1 sparkplug... the driver's side front closest to the radiator
14.) the distributor rotates like a clock (clockwise) and the numbers on the clock starting at #1 is 1-8-4-3-6-5-7-2.... this is the firing order in a clockwise direction
15.) take the next plug wire #8 and connect it to #8 spark plug
Note: the spark plug numbers are cast into the top of the intake manifold for easier identification
16.) conect the remaining wires to their respective plugs
17.) make certain that you have a full battery charge, some gas in the tank (gas evaporates over 3 years) and a full radiator.
18.) Turn the starter switch and listen for the engine to start
19.) If it doesn't start the first time, try again and wait for the gas to reach the carburetor.... try again
20.) if it still doesn't start spray some engine strating fluid into the carbuetor throat and try again... it should start
21.) if it starts but doesn't keep running then repeat step 20. unitl the gas reaches the carburetor and continues to run on its own...!
Remove spark plug, clean and dry. Replace plug. Remove air filter. Spray WD-40 into carb opening; one second blast. Turn over engine, (pull handle). Engine should start briefly and run for 3 seconds. If not, you are not getting spark to spark plug. If engine starts, you have a dirty carb and you can buy a rebuild kit from manufacture.
Lots of the starting problems with 2 cycle engines (weed eaters,
blowers, chain saws, etc) are caused by leaving them stored for long
periods of time with the oil/gas mixture left in them. what happens is
that a residue forms on parts in the carb.
Try the following: empty the fresh gas out of the blower. add a gas
stabilizer to the existing gas you plan to put in the blower. You can
get this stabilizer at any auto parts store. While you are there get a
can of spray start fluid. Put the fresh, modified gas in the blower.
Take the spark out and spray some starter fluid in the plug
hole.Replace the spark plug and try to start the engine.It will
probably take a few cycles of doing this to get the blower to stay
when you put the blower up for a long period, empty the remaining gas
out then start the engine and run it till it stops. this gets the
remaining gas out of the carb.