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Joined: Apr 2004
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Campfire 'Bwana
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OP
Campfire 'Bwana
Joined: Apr 2004
Posts: 42,816 Likes: 1 |
Gentlemen,
Briggs and Stratton, Quantum Engine, just won't start...
Carb has been pulled apart and cleaned and reassembled...
Magnito function has been verified by moving it to another motor to test...
New Spark Plug....
Using either ether or just priming it with fuel, by pulling handle slowly, engine seems it is trying to fire, but that is it...
Have broken 2 handles, pulling it quicker to get it to fire up...( not to mention rough on the hands even with a glove on)
The piston just seems to lock up and jerks to a stop, snapping the rope right out of my hand.
Fresh Oil...
Thought I would ask those in the "Know", before looking at replacing engine.. local shops would charge half the price of a new engine just to tell me if this one is still good or not...
Thanks for any input in advance...
cheers
seafire
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Joined: Nov 2006
Posts: 3,448
Campfire Tracker
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Campfire Tracker
Joined: Nov 2006
Posts: 3,448 |
Timing way off, maybe a sheared flywheel key?
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Joined: Oct 2009
Posts: 18,215
Campfire Ranger
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Campfire Ranger
Joined: Oct 2009
Posts: 18,215 |
Dirt-dobber build a nest in the exhaust.? (Happened on an ATV, wouldn't run till she was uncorked)
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Joined: Apr 2004
Posts: 42,816 Likes: 1
Campfire 'Bwana
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OP
Campfire 'Bwana
Joined: Apr 2004
Posts: 42,816 Likes: 1 |
Timing way off, maybe a sheared flywheel key? New keyway/flywheel installed...
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Joined: Apr 2004
Posts: 42,816 Likes: 1
Campfire 'Bwana
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OP
Campfire 'Bwana
Joined: Apr 2004
Posts: 42,816 Likes: 1 |
Dirt-dobber build a nest in the exhaust.? (Happened on an ATV, wouldn't run till she was uncorked) exhaust is back firing out of it, so that should be clear, but did take that off and tried to see if that was the problem... not long ago, I had to scrap another engine... bees actually managed to build a nest INSIDE the carb, and got down into the combustion chamber.... will look at the potential of a timing issue tho... I admit, about an hour ago, I was about ready to take it around the corner, out into the woods, and event my anger on it with a 30/06......
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Joined: Sep 2012
Posts: 8,736
Campfire Outfitter
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Campfire Outfitter
Joined: Sep 2012
Posts: 8,736 |
Has it run since flywheel/key changed, or did that get changed in hopes of fixing it?
You need three basics:
Timed spark
Compression
Fuel
Sean
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Joined: Oct 2003
Posts: 12,664
Campfire Outfitter
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Campfire Outfitter
Joined: Oct 2003
Posts: 12,664 |
The Karma bus always has an empty seat when it comes around.- High Brass
There's battle lines being drawn
Nobody's right if everybody's wrong
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Joined: Dec 2013
Posts: 1,705
Campfire Regular
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Campfire Regular
Joined: Dec 2013
Posts: 1,705 |
Sometimes we forget that engines have two types of timing ignition and valve.
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Joined: Mar 2009
Posts: 24,616
Campfire Ranger
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Campfire Ranger
Joined: Mar 2009
Posts: 24,616 |
Is the fuel turned on?
If you have spark, fuel and compression.....it should fire.
Have Dog
Will Travel
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Joined: Apr 2004
Posts: 42,816 Likes: 1
Campfire 'Bwana
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OP
Campfire 'Bwana
Joined: Apr 2004
Posts: 42,816 Likes: 1 |
yeah Sean,
I am well aware of the 3 simple things needed....that is why it is frustrating me....
and NO it hasn't run since the key way change.. which from your boys suggestions make me wonder if it is a timing issue....
don't know about you boys, when I get to the point of frustration with something, I loose about 90 % of my concentration ability, and feel like beating something mechanical or electrical that won't work with a hammer before I trash it....
"Minus the killings, Washington has one of the lowest crime rates in the Country" Marion Barry, Mayor of Wash DC
“Owning guns is not a right. If it were a right, it would be in the Constitution.” ~Alexandria Ocasio Cortez
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Joined: Apr 2004
Posts: 42,816 Likes: 1
Campfire 'Bwana
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OP
Campfire 'Bwana
Joined: Apr 2004
Posts: 42,816 Likes: 1 |
ya know, that could be a valid reason.... my son was the last one to use it last season.... and sadly like his mother, when she breaks something, she has no idea how it happened, or who did it... all she knows is it wasn't her.... typical female, typical teenager...
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Joined: Mar 2009
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Campfire Ranger
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Campfire Ranger
Joined: Mar 2009
Posts: 24,616 |
Was it running this year before today?
I see you said no.
Last edited by wageslave; 05/10/14.
Have Dog
Will Travel
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Joined: Apr 2004
Posts: 42,816 Likes: 1
Campfire 'Bwana
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OP
Campfire 'Bwana
Joined: Apr 2004
Posts: 42,816 Likes: 1 |
Is the fuel turned on?
If you have spark, fuel and compression.....it should fire. yeah Slavey, that's the theory.. but because it won't is what I am scratching my head over....
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Joined: Apr 2004
Posts: 42,816 Likes: 1
Campfire 'Bwana
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OP
Campfire 'Bwana
Joined: Apr 2004
Posts: 42,816 Likes: 1 |
Was it running this year before today? no it hasn't this year... was using my other mower, but it has started burning oil.. smokes like a 72 Vega with 250K on it when you start it up... Mower was given to me by a friend when she moved back to Boston the year before.. it was only two years old and low miles at the time...
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Joined: Apr 2004
Posts: 42,816 Likes: 1
Campfire 'Bwana
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OP
Campfire 'Bwana
Joined: Apr 2004
Posts: 42,816 Likes: 1 |
Three planned actions...
1. Go check Timing
2. Go load up 30/06 shell if timing issue doesn't work
3. Call up Northern Hydraulics, and order new motor...
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Joined: Mar 2009
Posts: 24,616
Campfire Ranger
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Campfire Ranger
Joined: Mar 2009
Posts: 24,616 |
If you cleaned the bad gas outta the carb and made sure the inerds were not schalacked up and re-assembled it correctly and made sure your tank and fuel line aren't full of schit and are getting spark out of the plug when you pull the rope, you got me.
Have Dog
Will Travel
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Joined: Sep 2008
Posts: 5,733
Campfire Tracker
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Campfire Tracker
Joined: Sep 2008
Posts: 5,733 |
"The piston seems to lock up and jerk to a stop"
It's got me wondering if your mower has an engine brake to kill the motor when you remove your hands.
If so, the cable may need adjusting to stay fully released.
It's a weird one for sure.
"Camping places fix themselves in your mind as if you had spent long periods of your life in them.
You will remember a curve of your wagon track in the grass of the plain like the features of a friend."
Isak Dinesen
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Joined: Jun 2009
Posts: 172
Campfire Member
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Campfire Member
Joined: Jun 2009
Posts: 172 |
You said you replaced the flywheel? Is the flywheel timed correctly for the motor?
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Joined: Apr 2006
Posts: 9,549
Campfire Outfitter
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Campfire Outfitter
Joined: Apr 2006
Posts: 9,549 |
don't know about you boys, when I get to the point of frustration with something, I loose about 90 % of my concentration ability, and feel like beating something mechanical or electrical that won't work with a hammer before I trash it....
I thought that was everyone's SOP. I don't believe were I in your shoes I'dve even mentioned it for fear of being labeled captain obvious. (grin) I once had a company computer keyboard that was possessed by the "touch/brush against the mouse pad and I'll delete this document" demon. That one got mashed into plastic flour via 2# hammer and scattered to the wind.
I can walk on water.......................but I do stagger a bit on alcohol.
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Joined: Nov 2006
Posts: 3,448
Campfire Tracker
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Campfire Tracker
Joined: Nov 2006
Posts: 3,448 |
Some small engines have a compression release ground on the cam profile that requires the valves to be gapped right at spec or they won't start.
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