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Not the flywheel key?


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#1 BrokenTractor OFFLINE  

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Posted November 24, 2017 - 02:31 PM

Hello,

 

I removed the flywheel on my Briggs 14.5 HP OHV (287707-1224-E1) to inspect the flywheel key. The key seems fine. I have it matched up with new key in photo and I can't tell the difference. 

 

The symptoms of the problem are:

 

1. Difficult start ( need starting fluid )

2. About once per second it backfires thru carb. Something new last 2 weeks.

3. Keeps surging. To keep it running need to hold choke flap 90% closed.

4. Seems like less horsepower but I could be wrong.

5. At full throttle engine rpm's seems less than normal.

 

I did notice a piece of a broken old screw stuff to the flywheel ( magnetized to it ) so I just removed it. 

 

Flywheel contact with ignition coil kind of rusty, does this matter?

 

Thanks,

BT

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#2 Gtractor OFFLINE  

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Posted November 24, 2017 - 03:12 PM

You are not getting adequate fuel flow.



#3 LilysDad ONLINE  

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Posted November 24, 2017 - 03:19 PM

Either not enough fuel or too much air, as in bad carb to block gasket. If you spray starting fluid around the gasket while it is running, it will speed up if the fluid is sucked in.



#4 boyscout862 ONLINE  

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Posted November 24, 2017 - 04:45 PM

Cleanup the rust it can make a difference. The carb problems may also be the problem. Good Luck, Rick



#5 DH1 ONLINE  

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Posted November 24, 2017 - 05:10 PM

Did you change the Spark Plug?

Do you have good Spark?

Do you have any Water in the gas?

Have you cleaned the Carburetor?



#6 KC9KAS OFFLINE  

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Posted November 24, 2017 - 06:24 PM

Sounds like a carb problem to me!



#7 WNYTractorTinkerer OFFLINE  

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Posted November 24, 2017 - 07:15 PM

Sounds like a carb problem to me!

x2..  or an air leak..  

Classic symptoms of running lean (plug will be light colored due to hot combustion chamber)  The plug will get so hot it will autoignite the fuel causing the backfire..  

 

Go through (clean) the carb with a fine tooth comb..



#8 Bigmatt OFFLINE  

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Posted November 24, 2017 - 11:05 PM

It might be a long shot, but adjust the valves (if possible). I had this problem once before on a kohler 12hp. It would pop and sputter badly from the valve stems growing in length as it got hot and not sealing. Holding the choke cooled the engine enough to let it run. I cleaned and replaced everything else with no improvement. I finally found I had to to open the valve clearance to the high end of the spec. All problems solved.

Or its just a dirty carb. Try soaking it in pinesol liquid. Remove any rubber or plastic parts first. 24 hours and it comes out spotless and you can reuse it many times. I've done 4 or 5 carbs with the same 2 bottles and it still works as well as the first time.

Bigmatt
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#9 Mark 149 J. ONLINE  

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Posted November 25, 2017 - 01:35 AM


Or its just a dirty carb. Try soaking it in pinesol liquid. Remove any rubber or plastic parts first. 24 hours and it comes out spotless and you can reuse it many times. I've done 4 or 5 carbs with the same 2 bottles and it still works as well as the first time.

Bigmatt

I've never heard of using pine sol before!  I'll have to remember that one!


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#10 1oldbuzz OFFLINE  

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Posted November 25, 2017 - 03:20 AM

Try resetting the valves to high end of spec

I looked back on previous posts

you have them at 5 and 7 that's too tight

most all are 7 on the intake



#11 WNYTractorTinkerer OFFLINE  

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Posted November 25, 2017 - 04:46 AM

Poke around HERE and maybe you'll find the correct specs..  (Exhaust clearance may be .017"  Intake  .009")


Edited by WNYTractorTinkerer, November 25, 2017 - 04:47 AM.





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