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I have a Toro mower with a Briggs and Stratton engine model

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128M02 3456-B1. I have used...
I have a Toro mower with a Briggs and Stratton engine model 128M02 3456-B1. I have used this mower for 4 years with no problems. Today it refused to start. I installed a new Champion RJ18LMC plug and when I tried to start it it backfires.
Submitted: 1 year ago.Category: Small Engine
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Answered in 35 minutes by:
8/31/2016
Technician: topdogpeter,
 replied 1 year ago
topdogpeter
Category: Small Engine
Satisfied Customers: 910
Verified

Hello and welcome to just answer and allowing me to assist you. have you checked for a good blue crisp spark, and is there any contamination in the fuel?

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Customer reply replied 1 year ago
There is excellent spark and no gas contamination
Technician: topdogpeter,
 replied 1 year ago

ok thank you for that info/ next you said it back fires right

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Customer reply replied 1 year ago
It did it twice.
Technician: topdogpeter,
 replied 1 year ago

a couple of things that will do that is timing, lean mixture . so when you try to start it do you chock it or does this have an auto choke

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Customer reply replied 1 year ago
Auto choke
Technician: topdogpeter,
 replied 1 year ago

so are you trying to start it cold first when it back fires?

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Customer reply replied 1 year ago
I has to be cold since I haven't started it.
Technician: topdogpeter,
 replied 1 year ago

ok then not being there I suspect that the auto choke is not closing enough to rich en the fuel to initially start it properly . Can you access the choke plate and see if it's closed fully or open/

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Customer reply replied 1 year ago
It's open. I have the air filter out of it to confirm that.
Technician: topdogpeter,
 replied 1 year ago

so the choke plate is open, that may very well be our problem

does it seem stuck or just no spring tension on the plate

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Customer reply replied 1 year ago
The choke plate is closed and it wont start.
Customer reply replied 1 year ago
What now?
Technician: topdogpeter,
 replied 1 year ago

sorry had a glitch on the sight and didn't allow me to respond

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Technician: topdogpeter,
 replied 1 year ago

ok try a few times to start with plate closed and then take out the spark plug and see if it is wet with fuel or dry

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Customer reply replied 1 year ago
The spark plug is wet.
Customer reply replied 1 year ago
Where do we go from here?
Technician: topdogpeter,
 replied 1 year ago

something is not adding up here first you said the choke was open then it was closed and you have a good spark and fuel but not trying to start? The fuel is new or was it sitting for a long time?

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Technician: topdogpeter,
 replied 1 year ago

ok remove the spark plug and burn it off with a lighter and while it's still warm put back in and try

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Customer reply replied 1 year ago
The fuel was purchased last Tuesday. The choke plate was closed. Sorry for the confusion. That's what I can't understand. I have fuel and spark but it won't start.
Technician: topdogpeter,
 replied 1 year ago

ok lets do this step by step, good fuel getting to engine , good spark.how old is this unit?

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Customer reply replied 1 year ago
I removed the plug and and used a lighter to burn off any excess fuel. Replaced the plug and it still won't start. The mower was purchased new by me 4 years ago. I mow a large yard and buy new gas every week. I bought a new plug this morning and gapped it at .020 per the manual.
Customer reply replied 1 year ago
I pulled the starter cord with the plug removed and gas came out of the plug hole.
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Curtis B.
Curtis B.
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