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briggs and stratton 5 hp Model # 128M05-5468-F1 will not start

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wayne64li
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2019/10/31 21:55:25 (permalink)
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briggs and stratton 5 hp Model # 128M05-5468-F1 will not start

Mower will not start. it did work last week. I did the following
new carb
new coil (magneto armature)
checked flywheel pin
new spark plug
mower has spark, 70 psi compression and holding. Even though the carb is new i sprayed staring fluid in carb. i also put in new gas. i took off the head. valves seem to be opening and closing. piston looks fine
Help!!!!!!!
 
 

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    wayne64li
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    Re: briggs and stratton 5 hp Model # 128M05-5468-F1 will not start 2019/11/02 18:11:28 (permalink)
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    I found the problem
    I noticed that on the power stroke the exhaust valve was opening. Right there, timing is off. This mower has a plastic gear on the cam.  The gear moved on the metal shaft throwing the timing of the piston and valves out of sync.
    Nobody responded so i guess im just talking to myself.  lol


    Roy
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    Re: briggs and stratton 5 hp Model # 128M05-5468-F1 will not start 2019/11/02 21:15:28 (permalink)
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    That is a good one, I have not seen that happen. Easy enough to check but who would think to?
    AVB
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    Re: briggs and stratton 5 hp Model # 128M05-5468-F1 will not start 2019/11/03 06:36:48 (permalink)
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    Not totally out of the possibility but I would thought the ACR would had been the failure since it is on the exhaust side of this engine. I have seen multiple of these ACRs to fail and be mangled pretty bad causing the exhaust to open at TDC compression.
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