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Tory bilt 21" lawn mower with briggs and stratton 550ex wont start no compression, valves are moving and piston is moving has spark

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  • 33 Answers

Loss of compression is usually a bad head gasket or the spark plug is seated tightly.

Posted on Oct 22, 2013

Testimonial: "i put a compression gauge on it and it didnt move. beofre it ran one day then cut off then nothing"

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Posted on Jan 02, 2017

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SOURCE: My lawn mower briggs & stratton engine 650 series will not start

check the fly wheel and coil it may have rust on it if so sand it off

Posted on Jun 26, 2009

  • 143 Answers

SOURCE: my lawn mower cranks but wont start I have

The magnets are fitted in the flywheel under the pullstart engine cover but i dont think thats your problem. It sounds more like fuel trouble. Remove and clean out the carb. and maybe renew the diaphram.

Posted on Sep 05, 2009

  • 1 Answer

SOURCE: Cleaned the Briggs & Stratton Riding Lawn

kehmahcliff:
It looks like that your valves need to be maintenanced. This can be done by small engine repair shops. They should have the proper tools.

Also the "timing" of the spark and the fuel injection could be a problem. I hope this helped you.

Greetings Joe

Posted on Sep 30, 2009

  • 152 Answers

SOURCE: LOOKING FOR A MANUAL FOR A 21" CUT SELF PROPELLED

try putting your serial number and model number here. http://www.troybilt.ca/troybilt/troybilt_manual_search.asp

Posted on Aug 08, 2010

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SOURCE: VALVE SETTING ON 21 HP BRIGGS AND STRATTON LAWN MOWER ENGINE MODEL 207577

i set mine to .006 and have no problems

Posted on Apr 03, 2012

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1 Answer

Why doesn't the pull cord wont move


Could be a few things but I would start by taking the spark plug out to reduce the compression. This will make it easier for the engine to turn just to make sure the piston is moving. If it is an older machine you may have rust build up all the way to a seized engine depending on maintance preformed on the mower.

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Hard hitting on compression stroke when starting


Most Briggs deco vaves are internal and pretty reliable, the valve clearances are very important, if the exhaust valve clerance is too wide the valve lifter will not work, if there is no adjustment yoy would have to fit a new service valve and re do the clerance by removing material from the valve stem

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if it spins fast check for compression if none take the valve cover off and see if the valves are working if there working remove the head and inspect the valves and piston

Apr 24, 2012 | Garden

1 Answer

Tory bilt lawn tractor replaced with new battery


What most likely happened is the diaphram in the carberator has burst. It is a simple fix if you take your time, use reliable resources and be patient. The parts can be picked up at the local hardware store.

Mar 25, 2010 | Briggs & Stratton Garden

1 Answer

How to adjust valves on briggs and stratton 17.5 h.p. troy bilt lawn tractor


Remove spark plug
Remove cover from engine that covers the flywheel
Remove rockerarm cover or valve cover
Find TDC (top dead center) by rotating the flywheel by hand and your finger over the spark plug hole as you rotate the flywheel you will feel pressure against you finger at some point then stop.
This is the compression stroke it is called now find a long slim round piece of plastic or plastic ink pen to stick in the spark plug hole (If you are careful a slim screwdriver can be used ) and find the piston top, then slowly rotate flywheel again (cw) as the piston is moving up pushing the plastic up as you rotate the flywheel slowly.
a max. piston up or tdc as you turn you will feel and then the piston starts to go the other way,at that transition this is tdc (piston is on top of stroke) leave it there,,both valves should be closed at that point.
Have a feeler gauge and set the exhaust valve at a loose .002 and the intake a loose .004 be sure engine is cold when valves are adjusted
Feeler gauge goes in between the rocker arm tip and valve stem top for each valve setting.
Note the rocker adjustment at the push rod side of each valve by tightening and loosening to make adjustments,lock your adjustments in place and rotate flywheel a few times and recheck settings

Sep 20, 2009 | Briggs & Stratton Garden

1 Answer

Ran over somthing with lawn mower now it wont


You're right to check the flywheel key - are you certain it's ok? Also our instinct is to tip the machine over to clear the obstruction, which can send oil to places it shouldn't be! Does the machine have compression? It's possible to break the con-rod if you hit something really solid. You can check the piston's still moving by taking out the spark plug and inserting something like a cable tie in the plug hole. As you turn the engine over you should be able to detect the piston moving up and down. The jolt could also have dislodged coke in the engine that could foul the spark plug. Try fitting a new one. Come back to me if none of these solutions work..

Sep 09, 2009 | Briggs & Stratton Lawn-Boy Insight Series...

3 Answers

Cleaned the Briggs & Stratton Riding Lawn Mower's head and valves. Put it back together and it refuses to start, get good starting try, no joy. Checked the spark, great! Checked the gas- great!...


did you usae a new head gasket and clean the old gasket off? does the plug get gas? you must have spark, fuel, compression and timing in order for it to run. also did you gap the coil to flywheel spacing?

Jul 08, 2009 | Parks Optical 13.5hp Briggs And Stratton...

1 Answer

190cc 3in1 briggs and stratton mower wont start... new plug and good spark..any ideas..


Take the carburator apart and clean it. Also, clean needle and seat. Please let me know if this helps.

Apr 24, 2009 | Briggs & Stratton Lawn-Boy Insight Series...

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