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I have a Deere hydro 175 that won't start. I replaced carb,

Customer Question
I have a John...

I have a John Deere hydro 175 that won't start. I replaced carb, fuel filter, fuel pump and plug. It was running fine but backfired and stalled. Would not start afterward.

Mechanic's Assistant: Do you have fuel in the tank? If so, is the shut-off valve open and the fuel clean?

Yes.

Mechanic's Assistant: Do you plan on doing the work yourself?

Yes

Mechanic's Assistant: Anything else we should know to help you best?

When it first stalled and wouldn't start, I cleaned carb jets and it started but ran rough. At least I was able to cut. Since then, nothing

Submitted: 8 months ago.Category: Small Engine
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Customer reply replied 8 months ago
Forget it. Please cancel my order. I'm not going to wait
Answered in 42 minutes by:
8/3/2017
Technician: Curtis B., Technician replied 8 months ago
Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 30,113
Experience: have worked on and around most engine models for 35 yrs./Polaris ATV expert
Verified

Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!

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Technician: Curtis B., Technician replied 8 months ago

Check the timing key, between the flywheel and the crankshaft.When engine backfires, it sometimes shears the key.

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Customer reply replied 8 months ago
Timing key is fine and I am getting spark to the plug
Technician: Curtis B., Technician replied 8 months ago

If you remove the spark plug and put a teaspoon of fuel direct into the cylinder, reinstall the spark plug, will it fir for a few seconds? If not check the compression.

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Customer reply replied 8 months ago
When I pull the plug, it is wet. After sitting, it tries to start and sputters and dies.
Customer reply replied 8 months ago
The carb is new, right out of the box. Does it need to be adjusted?
Technician: Curtis B., Technician replied 8 months ago

Plug is being fouled, due to over fueling. Is carburetor float and needle valve controlling the fuel?

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Customer reply replied 8 months ago
I assume but no idea
Technician: Curtis B., Technician replied 8 months ago

Remove the float bowl on carburetr an check the float and needle.

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Customer reply replied 8 months ago
The carb is brand new, right out of the JD box
Technician: Curtis B., Technician replied 8 months ago

Was that before or after the back fire?

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Technician: Curtis B., Technician replied 8 months ago

did you check the compression?

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Customer reply replied 8 months ago
It was after the backfire
Customer reply replied 8 months ago
When this all started, I was cutting and it suddenly backfired, stalled and would not start. I cleaned the jets on the carb and it started but ran rough. I was able to cut that first time but it wanted to stall when the blade was engaged. Has not started since. I then replaced the carb, fuel pump, fuel filter, plug and ignition module
Technician: Curtis B., Technician replied 8 months ago

Compression at least 80 psi?

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Customer reply replied 8 months ago
105
Technician: Curtis B., Technician replied 8 months ago

How did you check the flywheel key? Did you remove the flywheel?

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Customer reply replied 8 months ago
No. I took off the nut and saw that it was intact and engaged thru half the depth of the slot
Technician: Curtis B., Technician replied 8 months ago

I think key is sheared!

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Customer reply replied 8 months ago
It doesn't appear to be but I'll pull the flywheel and check. I won't be able to get to that until tomorrow after work
Technician: Curtis B., Technician replied 8 months ago

OK< with everything else correct, it seems that it needs to be checked!

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Customer reply replied 8 months ago
I pulled the flywheel today and the key is intact.
Technician: Curtis B., Technician replied 8 months ago

Remove the rocker cover and check the valve clearance. Should be .006 inch. Maybe there is a pushrod off.??

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Customer reply replied 8 months ago
I meant to say the key is intact. I pulled the flywheel today and it is intact.
Technician: Curtis B., Technician replied 8 months ago

Yes, and then I asked about the valves.

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Customer reply replied 8 months ago
reading up on how to do that
Technician: Curtis B., Technician replied 8 months ago

Remove the rocker cover and see if they are working!

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Customer reply replied 8 months ago
Finally was able to get back to my mower. Intake is .007, exhaust is .011. I assume both should be .006?
Technician: Curtis B., Technician replied 8 months ago

Yes, ideal would be .006 inch.

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Customer reply replied 8 months ago
I adjusted and it seemed like it wanted to start but sputtered and died. Did that twice and now just won't start. I know I asked you this before but are you sure ther is no adjustment needed on the carburetor? If you recall, I replaced mine with a new one and installed right out of the box with no adjustment.
Technician: Curtis B., Technician replied 8 months ago

Should need no adjustment, other than idle speed. Is fuel getting to the plug? Plug wet?

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Customer reply replied 8 months ago
Plug is wet. I replaced the fuel pump too
Technician: Curtis B., Technician replied 8 months ago

Plug is wet. Do you have good spark?

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Customer reply replied 8 months ago
I have good spark
Technician: Curtis B., Technician replied 8 months ago

Choke open, not flooding the engine?

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Customer reply replied 8 months ago
The choke is open, set in the cold start position
Technician: Curtis B., Technician replied 8 months ago

I wonder if the new carburetor float is stuck and needle valve is not shutting off the fuel/

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Customer reply replied 8 months ago
How do I determine that without tearing apart the carb?
Technician: Curtis B., Technician replied 8 months ago

The float bowl has to be removed, and float travel has to be checked, and see if it closes the needle valve and shuts off fuel into the bowl. Or pinch off the fuel supply and see f engine will start once the fuel has cleared the cylinder.

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Customer reply replied 8 months ago
Float is good
Technician: Curtis B., Technician replied 8 months ago

Cylinder still flooding?

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Customer reply replied 8 months ago
Don't know about the flooding but it's getting gas
Customer reply replied 8 months ago
I swapped carburaors and it does the same
Technician: Curtis B., Technician replied 8 months ago

Is exhaust plugged?

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Customer reply replied 8 months ago
Good thought but definitely not.
Technician: Curtis B., Technician replied 8 months ago

Was compression ever checked? Kawasaki should be over 100 psi.

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Customer reply replied 8 months ago
I did not check personally since I don't have a gauge but a friend checked and told me I was 105
Technician: Curtis B., Technician replied 8 months ago

Makes no sense, if timing is correct (key) valves set, has spark, and compression, and fuel, it should run. I assume fuel is good?

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Customer reply replied 8 months ago
Makes no sense to me either. Fuel should be good. Tank is fuel. Fuel cap has a split though. I know I need to replace thst
Customer reply replied 8 months ago
Makes no sense to me either. Fuel should be good. Tank is fuel. Fuel cap has a split though. I know I need to replace that
Technician: Curtis B., Technician replied 8 months ago

Only thing that has not been checked is the inner gear timing between crankshaft and camshaft!

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Customer reply replied 8 months ago
How do I check that?
Technician: Curtis B., Technician replied 8 months ago

Engine has to be separated, so you can get to the innards!

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Customer reply replied 8 months ago
It's unreasonable to even suggest I do that. I'm taking it to a JD repair center.
Technician: Curtis B., Technician replied 8 months ago

OK> It can be difficult! Thanks. Please rate to close the question and get me credit.

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Curtis B.
Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 30,113
30,113 Satisfied Customers
Experience: have worked on and around most engine models for 35 yrs./Polaris ATV expert

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