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Piston blocks during start ok when spark plug removed from tecumseh motor , spark plug removed fuel runs out of piston

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Remove the bowl from the carb and check to see if the float is full of gas. If not clean the needle and reinstall float and bowl.

Posted on Jul 18, 2009

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I installed new carb. on my tecumseh 5hp. snow king and it wont start. I have spark and gas is flowing out of carb.


This can be very frustrating and tough on the back and arm.
Always confirm the the fuel tank valve is open and the stop/run switch is in run position

It takes three things to run:
  1. Compression. This is the resistance that you feel as you crank the engine. Some engines have compression release to assist getting the rotation started. You should be able to feel the compression stroke as you rotate, Remove the plug and you can easily tell the deference. If it had, last time used, been running and starting with no problem I would assume that the compression is OK. Gauges are available to check. at lease 120 PSI
  2. Spark. It is near impossible to lose the spark timing on these. It can only be magnitude and presence. If in doubt about the condition of spark plug replace. I usually lay the plug on top of the head with wire attached and observe for the spark. No spark no start.
  3. Confirm that the throttle is in the wide open position. It is possible during the repair the spring or rod has closed the throttle air valve. Air/fuel mixture is always hard to trouble shoot. I use open choke and starter fluid to conform that compression and spark are working. After that I will choke on a cold motor and pull listening for the first fire. At the first fire I would usually half choke and pull to first run. Full choke for many pulls will only flood engine!! If no joy then I would allow engine to vent and go back to start fluid. If it will run on start fluid than either carburetor is messed up or quality of fuel is bad.
If after several tries and fuel is certain to be good remove plug and check for gas. It is possible that the new carb float valve or mixture adjustment screws are messed up.

Jan 10, 2016 | Tecumseh Garden

1 Answer

25 cc weedeater..new carb, new ring and piston, new gaskets, good compression..won't start. when removing plug and looking into cylinder after priming and attempting to start there doesn't appear to have...


Check you have a spark, connect a spare plug and hold it to an earth, crank the engine and watch for a spark. If not check your ignition circuit. If a good strong spark proceed:
Check fuel supply to carburettor - make sure there are no transit plugs that have not been removed. Easiest way is to disconnect the supply hose - no naked lights!!!!
If that\'s OK remove the carburettor float chamber and check that fuel is reaching the carburettor. If the float chamber is dry, check the float valve assembly. There\'s not usually much to small engine carburettors so if the fuels getting to the carb it may be a blocked jet or just very badly adjusted. There is also the possibility that the carb is faulty (yes I know it\'s new but ...!).
If fuel and spark is OK then it could be the spark timing - it should be OK unless you\'ve stripped the engine. On some engine\'s it is possible to set the spark 180 degrees out so that it sparks on the exhaust stroke - just to confuse things some engines spark on both exhaust & compression.
Good Luck!

Oct 28, 2013 | Garden

1 Answer

Mac 335 chainsaw won't start /run


Start with basic stuff first, drain the fuel tank and re fill with clean fuel oil mix, press the purge bulb ten or so times to pull the fresh fuel into the carb, now try again, if no better remove the spark plug and check for a spark ( make sure the ignition switch is on ) no spark try a new plug, still no spark check for wires shorting out, if ok replace the ignition unit, if it has a good spark is the plug getting wet with fuel, if not it may have a blockage in the carb, this will require a carb re build, if the plug is wet remove the muffler and check the condition of the piston through the exhaust port, any damage here and the saw will require a re build and possible new cylinder and or piston.

Jan 22, 2011 | McCulloch Garden

2 Answers

Toyota ceilca 2000 gts will not start


try reseting the alarm,maybe all thats needed.....

May 01, 2010 | 2000 Toyota Celica

1 Answer

The chainsaw will not start, fuel OK, spark OK, appears to have compression but, with the air filter removed, fuel vapour is expelled from the carb. when attempting to start, I suspect rings, any clues?


Basics to check:
1) Spark plug - brown or dark brown - OK
- aluminum or silver - piston/cylinder scored
a) is it carbon or fuel fouled
b) is there spark

2) Compression - 125 to 150 psi

3) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated

Depending on type of saw, you may see a small amount of fuel/mist while it is running, but I do not think you should see it as you pull the rope. If you make it thru the above checks, you should have a good idea what is going on with it.

Nov 11, 2009 | Garden

1 Answer

Blower was running fine, stopped for a while and when I atempted to restart, it wouldn't start. Doesn't even try. It always started on first or second pull. This is a two cycle engine. I put a new plug in...


Basics to check:
1) Spark plug - brown or dark brown - OK
- aluminum or silver - piston/cylinder scored
a) is it carbon or fuel fouled
b) is there spark

2) Compression - 125 to 150 psi

3) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
5) replace gaskets/diaphragms
b) use a spray carb cleaner to clean jets, holes, and body of carb

Nov 11, 2009 | Craftsman Garden

2 Answers

Won't run at full speed continuously. Cycles speed up and down even at full throttle.


Check and make sure the exhaust outlet is totally open. If it has a metal gauze screen slide it out and wash with carby cleaner and replace.
Blocked exhausts are common problem in 2 stroke engines because users run the motor too slow and it ( + oily residue) carbons up the exhaust. With a blocked exhaust, usually the moror will start and idle pretty ok but will screw up when you try to run at full revs.

In Australia we get mud wasps building nests in there - a quick poke out of the mud and she's running full throttle again.

ps. Don't fiddle with the 2 mixture screws - unless your know what you are doing. You will only make it worse!!.

Nov 07, 2009 | Homelite Consumer Products Backpack...

1 Answer

This Model 358-797251 Leaf Blower will not start. What can I do to make the engine run at the regular speed?


Basics to check:
1) Spark plug - brown or dark brown - OK
- aluminum or silver - piston/cylinder scored
a) is it carbon or fuel fouled
b) is there spark

2) Compression - 125 to 150 psi

3) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated

Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
5) replace gaskets/diaphragms
b) use a spray carb cleaner to clean jets, holes, and body of carb

Oct 19, 2009 | Craftsman 4 Cycle Blower/Vac

1 Answer

Toro 724 snowblower won't start


One of two things will cause this. Either your piston rings have fried and your piston is stuck. The bearing on the flywheel is bad. Or actually one of thing, the crank shaft has broken. You willl need to take the motor apart all the way and see what is going on. If you take the flywheel off try to turn it by hand and see if you can turn it that wy. You also can try easier to check for first symptom is to make sure you are not in vapor lock. Remove the spark plug, turn unit upside down and see if you can get the motor to turn, if you can then replace the spark plug and it will start up. You can getvapor lock by running it low on fuel or the wrong fuel or running it to rich

Feb 09, 2009 | Tecumseh Horizontal Tiller Engine 8 Hp, 1"...

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