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post #1 of 78 Old 03-20-2017, 12:45 PM Thread Starter
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Help with Briggs OHV 14.5hp engine

I am at a loss here. My riding mower uses a Briggs 14.5 OHV 287707 model engine. I have replaced the starter, the armature, the spark plug. I have set the gap on the armature to .010. I have reset both valves to .003 intake and .006 exhaust. The mower will fire once right away and then stop. The plug will be coated in gas. Sometimes it will backfire instead of fire. But that is all I can get.. fire once stop. Fire once... stop. I have tried a different plug, but the result is the same.
I cannot for the life of me figure out what the issue is.
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post #2 of 78 Old 03-20-2017, 12:55 PM
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Re: Help with Briggs OHV 14.5hp engine

I hate to tell you, But you wasted money on the starter The most likely source of your problem is your carburetor. The float is most likely sticking and allowing access gas to get in the engine.

Have you had the engine for a while or did you just get it? The reason is that if it has been sitting a while the float can get stuck. Although when they sit the carbs usually get plugged from old gas anyway.

I would rebuild your carb, or at the very least take it apart and look at, it if it's gummed up or rusty then it will likely be your problem. Sometime's they look good but still have issues but normally that's just a little dirt that got in it.

It's not too hard to fix carbs, You can look up videos on youtube. If you have a basic knowledge of mechanics and some tools you should have no trouble at all.

Hope this helps!

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post #3 of 78 Old 03-20-2017, 01:28 PM Thread Starter
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Re: Help with Briggs OHV 14.5hp engine

Sorry I should be clear. The starter was bad last year. So was the armature. I got this from a guy who left it sitting and replaced those parts to get it running.. which it did all last year. This year.. it is not running at all. I have taken the carb apart before so that shouldn't be an issue. I will give it a go.
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post #4 of 78 Old 03-20-2017, 04:37 PM
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Help with Briggs OHV 14.5hp engine

Check your flywheel key if it'll fire 1 and stalls you possibly have a sheared key if it's backfiring it's a good indicator when mine sheared a key it would fire 1 and the starter would spin the engine over like there was no compression and smoke would come out the muffler if yours does this check the key if it's broke put a new 1 in and impact the flywheel nut on to stop it from flaking on you as I could never get it tight enough to stop it from breaking keys till I got mad and impacted the nut on yours maybe a bolt you can still impact it on tho
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post #5 of 78 Old 03-20-2017, 06:45 PM
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Re: Help with Briggs OHV 14.5hp engine

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Check your flywheel key if it'll fire 1 and stalls you possibly have a sheared key if it's backfiring it's a good indicator when mine sheared a key it would fire 1 and the starter would spin the engine over like there was no compression and smoke would come out the muffler if yours does this check the key if it's broke put a new 1 in and impact the flywheel nut on to stop it from flaking on you as I could never get it tight enough to stop it from breaking keys till I got mad and impacted the nut on yours maybe a bolt you can still impact it on tho
Oh whoops, Forgot to mention the flywheel key, That is a possibility. I had the exact same engine you had and I couldn't get it to start, turns out twas the flywheel key.

John 3:16

You must be the change you wish to see in the world - Mahatma Gandhi

Be sure you put your feet in the right place..... THEN STAND FIRM - Abraham Lincoln

My Computer: Custom Built Gaming Pc, Amd x4 860k Cpu, Rx480 Graphics Card, 1Tb Hard Drive

My Toys: John Deere GT225 48", Cub Cadet Lt1045 20HP V-Twin 46", New Cub Cadet GT1554 27HP 54", Yard Machines 21HP 46", 1994 Stiener 420, 2004 Susuki Eiger 400(The speed machine).
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post #6 of 78 Old 03-20-2017, 06:59 PM
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Re: Help with Briggs OHV 14.5hp engine

My craftsman sat 6 yrs before I got it the acr was bad on the 16.5hp ohv so it kept breaking keys bc the compression relief wasn't happening for easy start but the starter I had was an opposed twin starter that I converted to a single engine starter problem was it was so strong in torque if you didn't have that nut tight enough the flywheel would slide snapping the key
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post #7 of 78 Old 03-20-2017, 08:48 PM
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Re: Help with Briggs OHV 14.5hp engine

Shearing flywheel keys is a sign of improper torque setting OR not cleaning the crankshaft and inside of flywheel tapper.

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post #8 of 78 Old 03-20-2017, 09:23 PM
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Re: Help with Briggs OHV 14.5hp engine

i sheared a key due to hydrolock from flooding carb. initially it would start but not reach top speed. then it just blew fire out the carb
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post #9 of 78 Old 03-20-2017, 09:47 PM
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Re: Help with Briggs OHV 14.5hp engine

Man everyone has more fun with there engines mine always die calmly o.O lol fire out the carb is nuts man must of been crazy to see I did 1 time on my 18 hp opposed blow flames out the barrel muffler when a valve got stuck on 1 side the engine tho
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post #10 of 78 Old 03-20-2017, 09:54 PM
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Re: Help with Briggs OHV 14.5hp engine

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Man everyone has more fun with there engines mine always die calmly o.O lol fire out the carb is nuts man must of been crazy to see I did 1 time on my 18 hp opposed blow flames out the barrel muffler when a valve got stuck on 1 side the engine tho
I hear ya man I've never had anything blow up on me either. lol

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You must be the change you wish to see in the world - Mahatma Gandhi

Be sure you put your feet in the right place..... THEN STAND FIRM - Abraham Lincoln

My Computer: Custom Built Gaming Pc, Amd x4 860k Cpu, Rx480 Graphics Card, 1Tb Hard Drive

My Toys: John Deere GT225 48", Cub Cadet Lt1045 20HP V-Twin 46", New Cub Cadet GT1554 27HP 54", Yard Machines 21HP 46", 1994 Stiener 420, 2004 Susuki Eiger 400(The speed machine).
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post #11 of 78 Old 03-20-2017, 10:10 PM
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Re: Help with Briggs OHV 14.5hp engine

Yeah the opposed didn't blowup completely but if you read the post I have on b&s opposed twin I'm still having to put 75 into it with brand new valves as the1 that got stuck is completely History got stretched and lost its tempering and now hits inside the head on the left side it ran fine after I got it unstuck for last summer but I used during the winter and that's when it started knocking from the valve hitting inside the head
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post #12 of 78 Old 03-21-2017, 01:39 PM Thread Starter
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Re: Help with Briggs OHV 14.5hp engine

So I am in the process of pulling the nut off to view the key. I did clean out the first part of the carb (bowl, needle, and blew it with a can of air, plus carb cleaner) and that didn't seem to change anything. Backfiring.. should call it forward firing since the muffler is forward has gotten worse.. sounds like a shotgun now. I gave up last night after looking all over for my large socket wrench. I am about two steps away from tossing this. I got it free and just to get it running replaced about $100 worth of parts.. last year had to replace all the belts, then near the end of the year it started dying going up hill.. like crawling up hill.
I don't know small mechanics at all.. this is only my second engine.. the first one I tried to rebuild was an old honda harmony and I blew it up because I didn't set the governor correctly (It was also free and I only put $80 into it).

so... I am learning as I go.
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post #13 of 78 Old 03-21-2017, 05:39 PM
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Re: Help with Briggs OHV 14.5hp engine

It's baby steps bud take it easy and pace yourself as you go don't get frustrated you'll get the engine going a Honda engine is very complicated compared to a Briggs as Briggs haven't really changed since the 40s they just got bigger and materials used have changed but there all timed the same basically with a dot to dot timing system let us know when you check the key if it's broke just put a new one in and tighten as much as you can if it continues to break do what I did take an impact wrench to it
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post #14 of 78 Old 03-21-2017, 09:11 PM
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Re: Help with Briggs OHV 14.5hp engine

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Originally Posted by Hallabat View Post
It's baby steps bud take it easy and pace yourself as you go don't get frustrated you'll get the engine going a Honda engine is very complicated compared to a Briggs as Briggs haven't really changed since the 40s they just got bigger and materials used have changed but there all timed the same basically with a dot to dot timing system let us know when you check the key if it's broke just put a new one in and tighten as much as you can if it continues to break do what I did take an impact wrench to it
Yeah, It's very easy to get frustrated at engines. I normally talk(yell) to them as if they know what i'm saying

John 3:16

You must be the change you wish to see in the world - Mahatma Gandhi

Be sure you put your feet in the right place..... THEN STAND FIRM - Abraham Lincoln

My Computer: Custom Built Gaming Pc, Amd x4 860k Cpu, Rx480 Graphics Card, 1Tb Hard Drive

My Toys: John Deere GT225 48", Cub Cadet Lt1045 20HP V-Twin 46", New Cub Cadet GT1554 27HP 54", Yard Machines 21HP 46", 1994 Stiener 420, 2004 Susuki Eiger 400(The speed machine).
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post #15 of 78 Old 03-21-2017, 09:25 PM
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Help with Briggs OHV 14.5hp engine

I swear and growl and throw things sometimes I'll stomp on the junkpile and my neighbors say I sound like lunatic I tell em I never claimed to be sane lol karate chopped my engine cover and crushed it next day I was straightening it back out asking why did I do that lol
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