Briggs 28Q700 - Flywheel issues....
- Thread starter Dr_Jim
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Lawnranger
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Black smoke means the air/fuel ratio is too rich. Causes could be a dirty air filter, improper mixture setting on the carburetor (if applicable as some carburetors are not adjustable), choke plate not fully opening, excessive carbon in combustion chamber causing incomplete combustion, etc. Perform the simple checks first and report back with what you find.
Re: Briggs 28Q700 - Flywheel issues.... NO JOY!
Well! I should not have spoke too soon after only running the mower a few minutes last night. (After valve job).
Things are NOT well.
Tonight:
-Put in new air filter....put shrouds back on....
Fired it up. The starter had trouble cranking,...it engaged....and spun....but very hesitantly....Upon re-tries it started. But had to crank awhile!!
*Note: When starting you must have the brake depressed.
When it would 'catch' and start running....it ran rough....10-30seconds...when I took my foot off the brake it died.,....and backfired a big spark
Started realizing it would die everytime after I let off the brake.
On more start attempts I noticed that keeping the key in the "start" position while waiting for the engine to catch....with the starter running: The + wire on the bat was smoking and melting the rubber sleeve around the + terminal
Finally I decided to start it, keep my foot on the brake (since for SOME reason taking my foot off the brake causes the engine to stop)....so I ran it like that for awhile (maybe 1 minute)...before I noticed an orange glow "pulsing", "emitting" from the muffler.
SO I shut it down immediately. The muffler area was HOT....TOO HOT.
So I am at a loss.
- Something is up with the safety switch on the foot brake. I put in a new solenoid. There were 2 fin clips....blue wire and white wire. I did not think it mattered which wire went to which fin....maybe it does?
- Could I have screwed up the valve adjusment?
- Again, the starter motor has trouble turning the flywheel....it DOES,...but only have several start attempts.
- Pulled plug....nothing crazy...looked fine.
- Brand new hi amp cold crank battery. New starter motor. New ring gear. New solenoid. New ignition switch. New fuel filter. New air filter. New plug. Checked and gapped properly.
Thoughts?
Well! I should not have spoke too soon after only running the mower a few minutes last night. (After valve job).
Things are NOT well.
Tonight:
-Put in new air filter....put shrouds back on....
Fired it up. The starter had trouble cranking,...it engaged....and spun....but very hesitantly....Upon re-tries it started. But had to crank awhile!!
*Note: When starting you must have the brake depressed.
When it would 'catch' and start running....it ran rough....10-30seconds...when I took my foot off the brake it died.,....and backfired a big spark
Started realizing it would die everytime after I let off the brake.On more start attempts I noticed that keeping the key in the "start" position while waiting for the engine to catch....with the starter running: The + wire on the bat was smoking and melting the rubber sleeve around the + terminal
Finally I decided to start it, keep my foot on the brake (since for SOME reason taking my foot off the brake causes the engine to stop)....so I ran it like that for awhile (maybe 1 minute)...before I noticed an orange glow "pulsing", "emitting" from the muffler.
SO I shut it down immediately. The muffler area was HOT....TOO HOT.
So I am at a loss.
- Something is up with the safety switch on the foot brake. I put in a new solenoid. There were 2 fin clips....blue wire and white wire. I did not think it mattered which wire went to which fin....maybe it does?
- Could I have screwed up the valve adjusment?
- Again, the starter motor has trouble turning the flywheel....it DOES,...but only have several start attempts.
- Pulled plug....nothing crazy...looked fine.
- Brand new hi amp cold crank battery. New starter motor. New ring gear. New solenoid. New ignition switch. New fuel filter. New air filter. New plug. Checked and gapped properly.
Thoughts?
Lawnranger
Well-Known Member
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- Apr 18, 2012
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Your mower has multiple problems and we will take one at a time. First you will need to remove the negative battery cable and then the positive, in that order. The fact that the positive battery cable is smoking and melting the insulation tells me that there is too much resistance and most likely the cable end where the eye is crimped has corrosion or is not tight. In regard to electricity, resistance = heat and you will need to correct the high resistance in the connection. You will probably need to purchase new cable ends, cut the old ones off, strip an inch or so of insulation and crimp new eye connectors on. Make sure you battery posts are clean and the connections are tight when you go back together with the connections.
Second, you will need to address why the muffler is glowing orange. Again, you are dealing with too much heat. You should go back and recheck the valve adjustment. What procedure, exactly, did you use to adjust the valves? How much valve clearance do you have? As I mentioned in an earlier post the process is very specific and must be performed correctly. Since you are the eyes and fingers in this situation you will have to post everything you have done and how you did it.
Third, the starter control circuit has several safety switches in the system so you will need to test each switch individually to find the one that is not working properly. For now, you can set the parking brake to hold the clutch/brake pedal down when you want to start the engine but do not try starting the engine until you get the other problems sorted out.
Report back with your findings.
Second, you will need to address why the muffler is glowing orange. Again, you are dealing with too much heat. You should go back and recheck the valve adjustment. What procedure, exactly, did you use to adjust the valves? How much valve clearance do you have? As I mentioned in an earlier post the process is very specific and must be performed correctly. Since you are the eyes and fingers in this situation you will have to post everything you have done and how you did it.
Third, the starter control circuit has several safety switches in the system so you will need to test each switch individually to find the one that is not working properly. For now, you can set the parking brake to hold the clutch/brake pedal down when you want to start the engine but do not try starting the engine until you get the other problems sorted out.
Report back with your findings.
WOW! there are several unrelated issues here. The muffler glowing red has nothing to do with electrical, BUT if your flywheel key is semi sheared, your ign timeing will be off. For example, if the engine is fireing when the exhaust valve is still a little open, "that" combustion will exit out the muffler. I have seen this same thing with burned ex valves where they don't seat well. With the spk plg out,, does the engine turn over freely and loose? It should.