Hello, my name is Jack (MR.PUTTPUTT) thanks for contacting Just Answer let me see if I can be of some assistance to you.
I own and run a MTD Troy-Bilt warranty and repair center, can you tell me how old is the unit?
a couple years
you have adjusted the valves, and replaced the carb with a new one?
ok on testing the spark did you lay the spark plug against the cylinder body to verify spark or did you have a spark tester
is it a new plug
with the spark plug installed? and tester in between the wire and plug correct
no the plug is not new but did swap it with another used one
what kind of tester?
just so I can ref
no plug installed and tester on plug lead and grounded to muffler
did you do a compression test?
do not have a fitting small enough for my tester
I know that it is said that you have to have fuel and spark to run but you also have to have correct compression also
I have seen several of these units over this summer that have scored cylinders
thats not good
do you happen to have a bore camera?
the only way to tell is if you have a compression test or a borescope to see if it is scored you may be able to see with a flashlight and removing the plug and try and look into the cylinder. if you see any vertical scratching it is scored and even the slightest rubbing marks will affect the compression
some automotive parts stores will let you use a compression tester with a rubber tip that just gets held against the hole and then you can pull over to see the readings
my guess is that the cylinder is scored but will need to be verified
ok let me see if i can get a adapter to check... comp should be 110 lbs
you should have all of that let me look for the correct reading in a service manual just a min
I am looking do you have a service manual for this?
no i dont. but i think they all run around 110 lbs..... i should be able to find it. ..now what if comp is good. what then
here is a complete service manual for you
if compression is good then you could have a plugged spark arrestor in the muffler also if yours has one on it most do
this is a small screen on the outlet of the muffler should be held in by a screw or two
look at it seemed ok.. now i could pull the muffler and get a look at the cyl
yes you may be able to get a peek that way to
take off muffler and remove spark plug and shine light into it
ok let me look..... thanks
I will be here let me know
will do .