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#446T spins free no compression, 2 cycle

When you pull the flywheel cord it spins free, no compression at all thank you

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If you are certain the pull starter is spinning the flywheel it may be one of a couple things:
The key on the flywheel is sheared, replace the key.
The piston is not moving within the cylinder, replace the trimmer.

Posted on May 14, 2009


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Tryed to start engine, after a couple of pulls the engine will freeze up and will not turn

Oooo hmmm . Wow ....
John could be many things , how old is this Briggs ?
Well first thing i would do us remove spark plug . This takes any compression off that adds to the load and for SAFTEY reasons in the following step.
Try to roll the crank shaft from the blade , it is directly bolted to output crankshaft and will give you som leverage .
Flip mower on its side opposite of the oil filler plug . Now looking at the blade you want to rotate counter clockwise (i beleive )
or roll the same way leading sharp edge is facing . You may have to rock the blade slightly back then forward . This should move the crank and rod ,piston once it moves it should be free enough to go only 1/2 full revolution , don't roll completely full revolution . The idea is to get the piston down . Usually when they seize piston is
top dead center on either compression or exhaust stroke . That doesn't matter . Now if you have it this far you should be able to move fairly easily but slowly in same direction on the second half as piston us coming up , notice if it is gaining restriction and becomes harder and then seizes again . If so rod wrist pin is may be at falt . If it continues through travel , repeat in same direction over and over . . If all is fine , flip mower back on wheels and THEN remove top pull cord housing to expose flywheel .
Place the housing on the soft ground so it will dig in a little and pull back on pull cord . If does not pull your problem will be in the centrifical cam locks that engage out ward to turn flywheel . Easy Peasy fix . May be simply binded pull cord . Pull cord sometimes will jump sheave and get in between on the top of sheave and housing .
Let us know what you find , I'm especially curious .
use the comment box and I will get a notification that you commented ......... Later John ....... Thanks

Sep 22, 2016 | Briggs & Stratton Garden

1 Answer

I replaced a broken starter cord and when I reassemble the starter won't turn. Any ideas?

Remove for the n-th time the pull start assembly. Confirm the engine will in fact rotate by hand. Turn the flywheel a full turn or more ensuring that the engine is free. You should expect to feel some resistance from the compression cycle.

Holding the hand crank assembly attempt to pull the pull-cord and observe that the hub rotates. When released the spring returns the cord and handle into the wound position.

If the cord will not pull or operate as expected then remove and reassemble the cord into the pulley making sure that the knot retaining the cord is small enough and does not interfere with the operation. U-tube has several videos showing how to assemble the cord to the hub.

Nov 21, 2015 | Garden

1 Answer

Poulan model 262 chain saw. Pull cord extrememly hard to pull and turns only a few revs. Is there any compression release or is exh valve likely sticking? It was hard in the past but would start. Had to...

I would re check your flywheel and make sure you got it lined up with the shaft key slot, and that you used an impact of somekind to tighten it cause if you did;nt it could of come loose first time it fired and now it is out of time (ignition) therefore fighting against you trying to start it....there is no exhaust or intake valves on a 2 Stroke.........Good Luck

Apr 30, 2011 | Poulan Garden

2 Answers

Rope hard to pull, engine spins freely with plug removed

First off Husqvarna does not make Craftsman chainsaws. Chainsaws are very high compression usually 125 to 150 lbs. pulling the rope slowly will make it very hard to pull. Short fast pulls are best, this allow the flywheel to build momentum to get it past the compression portion of the piston trvavel.

Jan 15, 2010 | Husqvarna Craftsman 36cc, 16 In. Gas Chain...

2 Answers

I have a Cub Cadet cc4125 string trimmer not starting

need a little more information .. but look for the following .. take out the spark plug and look inside with a flashlight ... if the piston is moving with the rotation of the flywheel then you likely have a blown head gasket .. if there is no compression there wont be a load on the pull cord .. a cracked or damaged piston can also do this .. ... if the piston is not moving when you rotate the flywheel then you likely have a bad "shear key" sometimes called a "shear pin" .. thats usually a half moon shaped small metal part that keeps the flywheel locked rotationally to the crankshaft .. it is designed to shear off if there is an excessive sudden load on the engine .. the flywheel will then spin without turning the crankshaft .. the same thing will happen if you have broken the connecting rod .. (a rod failure is often preceded by lots of clatter from the engine) .. the head gasket or shear key are much more likely to be your problem .. if you cant see in the spark plug hole you might try using a straw to feel the piston motion .. its possible that without the spark plug in place the piston might move even with a bad shear pin .. because with no compression the piston will move freely .. if thats the case you can stop the piston motion with a wood dowell thru the spark plug hole .. if it moves in spite of your dowell resistance then consider the head gasket option ..

Sep 19, 2009 | Garden

1 Answer

I have a briggs and startton lawn mower and the

under the pull cord housing is this little arm that pulls out when you pull the cord. Thus, the little arm locks into place on the pulley and turns the flywheel which turns the motor over. The arm inside may need to be greased and worked a bit. Sometimes the springs do fall off

Jul 10, 2009 | Mantis 2-Cycle Tiller

1 Answer

My Poulan chain saw has a sticking pull cord....r

Check the flywheel and flywheel key. It sounds like the timing is off.

Mar 27, 2009 | Poulan P3314 14" Gas Chain Saw 2.0 Cuin...

1 Answer

On a Poulan Pro pruner(446T), it wouldn't start so I put new fuel lines on and cleaned the carb. Then it wouldn't fire, so I replaced the coil pack but still nothing. It doesn't try to fire even after I...

I have an earlier model of Poulan Pro Pruner with a similar problem. It is a PP258 and looks identical to the 446T. My unit had about 3 hours of use max.This was the second year. It had some compression but I was not sure it was enough. It would not start and had good spark. I pulled the plug and put about an ounce of oil in the cyl and put the plug back in. Pumped the primer bulb and put carb to Start. On the first pull I could tell the compression was better. It started on the second pull and would only run wide open and smoking from the oil. Something was wrong in the cylinder. I dissasembled the engine and discovered a tiny piece of metal had gotten caught between the cyl wall and the piston. The cyl was scored and the ring land pinched the ring. Time to get some new parts. I also had to use my air cut off saw to get the clutch drum off because the screw wouldn't budge. About $60 will fix it. Overall it isn't a job fopr the average homeowner. What a pain.

Mar 27, 2009 | Poulan Garden

2 Answers

Snow blower

The flywheel is located behind the recoil assembly. There are 4 bolts that secure the recoil to the engine. 2 on top near the spark plug and 2 at the bottom of the recoil houseing.

Dec 13, 2008 | Mantis 2-Cycle Tiller

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