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How to remove flywheel from 6.75 craftsman lawnmower

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Posted on Jan 02, 2017

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SOURCE: I have a 6hp Craftsman 6hp Mulcher 21

The only thing I can think of off hand is the flywheel key. Take the flywheel off and check the key. If it is broken, sometimes you cannot get a spark. Sometimes it will just backfire. Check it and I hope you are sucessful...Lee

Posted on Sep 23, 2009


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How do i take off the pull start from a craftsman model 917.377582 lawnmower

engine numbers would be helpful buttttt.... the perimeter of the recoil assy should be 3-5 small screws. remove them and it should come off, the is as long as you have a eagerbeaver engine ( tecumseh ohv )

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How old is the engine? Does it have electronic ignition or points? Check the engine stop wire where it attaches to the throttle control on the engine. Make sure it is not grounding out. Has the magneto been removed? That is the Y shaped part behind the flywheel, where the spak plug wire attaches. If the mag has benn removed, it needs to be re-adjusted. The correct gap is .020 of an inch, about the thickness of a matchbook. This gap is measured between the two legs of the mag and the flywheel. I hope this helps, good luck.

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Craftsman gold 6.0 hp. walk behind lawnmower wont start

Back to basics, is the fuel in the tank good?( fill with fresh fuel ) does it have a spark at the plug?(remove the plug, earth against the cylinder, is there a spark,if not, replace the spark plug and try again ) does the plug wet with fue lafter pulling?( clean/service carb ) is the spark occuring in the correct place ( flywheel key sheard ) has the engine got good compression?

Aug 19, 2013 | Briggs & Stratton Briggs Stratton...

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How to set the timiing briggs stratton 675 series


The timing on a lawnmower engine is controlled by the positioning of the flywheel on the crankshaft. There is a key (square metal pin) holding the flywheel at a predetermined location on the crankshaft. If the engine is out of time, the flywheel has slipped on the crankshaft (hitting a rock, brick or anything else solid with the blade will cause this.

The solution:

1. Disconnect the spark plug wire.
2. Remove the motor upper housing (usually a 3/8 or 7/16 bolt).
3. Remove the bolt at the center of the flywheel (use an impact wrench if you have one... or wedge a large screwdriver against one of the cooling fins and the magnet boss, not between two fins or you may break a fin.
4. Use a wheel puller to remove the flywheel.
5. Remove the square key that is between the flywheel and the crankshaft, (you'll notice that the key is damaged and will need to be replaced. Home Depot or Lowe's or any lawnmower repair shop should have a new key.
5. Install the new key in the slot on the crankshaft.
6. Reinstall the flywheel. (if the magnets are rusty, now would be a good time to gently sand the rust off of them, but do not mess with the magnetic pickup as the gap distance between the pickup and the flywheel is crucial)
7. Reinstall the top cowling.
Your mower should be ready.

Jul 22, 2012 | Craftsman 675 Series 190cc 22" Briggs ...

1 Answer

I have a 6hp Craftsman 6hp Mulcher 21" Lawnmower' about 8 years old that has lost its spark, replaced the s/plug removed the flywheel, checked the wire at the magneto end, checked the wire at the shutoff...

The only thing I can think of off hand is the flywheel key. Take the flywheel off and check the key. If it is broken, sometimes you cannot get a spark. Sometimes it will just backfire. Check it and I hope you are sucessful...Lee

Sep 23, 2009 | Garden

1 Answer

Craftsman eager-1 lawnmower will not start

Hi, The first thing I always check for is fresh fuel (less than a couple of months old) old unleaded may well be fine in your car but low compression engines fitted to garden equipment need fresh fuel. next thing to check is that the choke flap is closing fully, dont rely on the position of the control lever, remove the airfilter cover and see that the flap is fully closed, if it's cracked open just a little bit it will stop engine starting ( unless the filter is really dirty) another thing to check is that the blade is tightly secured, on direct drive mowers the blade acts as a flywheel. did you hit an obstruction the last time you used it, if you did you may have sheared the flywheel key(poor spark on points ignition or good spark but timing out of sync on electronic ignition. hope this helps, regards Tony (England UK)

Aug 31, 2009 | Craftsman Garden

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I have a Craftsman self-propelled lawnmower that will not start.

first remove air filter and spray starting fluid in the carb? if it starts the fuel is the problem carbs are easily removed and cleaned make sure needel is not stuck? if it dosnt start chexk for spark pull rope hold screwdriver over wire touch it too plug end see if you see spark if not? then you must test zone conrol cable and grounds? did you hit something hard with the blade if so you could have a sheered flywheel key it will trow egine out of time ?

Aug 27, 2009 | Garden

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