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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 28887
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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I have a Deere hydro 175 that won't start. I replaced carb,

Customer Question

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.
JA: Do you have fuel in the tank? If so, is the shut-off valve open and the fuel clean?
Customer: Yes.
JA: Do you plan on doing the work yourself?
Customer: Yes
JA: Anything else we should know to help you best?
Customer: 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: 2 months ago.
Category: Small Engine
Customer: replied 2 months ago.
Forget it. Please cancel my order. I'm not going to wait
Expert:  Curtis B. replied 2 months ago.

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!

Expert:  Curtis B. replied 2 months ago.

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

Customer: replied 2 months ago.
Timing key is fine and I am getting spark to the plug
Expert:  Curtis B. replied 2 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.

Customer: replied 2 months ago.
When I pull the plug, it is wet. After sitting, it tries to start and sputters and dies.
Customer: replied 2 months ago.
The carb is new, right out of the box. Does it need to be adjusted?
Expert:  Curtis B. replied 2 months ago.

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

Customer: replied 2 months ago.
I assume but no idea
Expert:  Curtis B. replied 2 months ago.

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

Customer: replied 2 months ago.
The carb is brand new, right out of the JD box
Expert:  Curtis B. replied 2 months ago.

Was that before or after the back fire?

Expert:  Curtis B. replied 2 months ago.

did you check the compression?

Customer: replied 2 months ago.
It was after the backfire
Customer: replied 2 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
Expert:  Curtis B. replied 2 months ago.

Compression at least 80 psi?

Customer: replied 2 months ago.
105
Expert:  Curtis B. replied 2 months ago.

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

Customer: replied 2 months ago.
No. I took off the nut and saw that it was intact and engaged thru half the depth of the slot
Expert:  Curtis B. replied 2 months ago.

I think key is sheared!

Customer: replied 2 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
Expert:  Curtis B. replied 2 months ago.

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

Customer: replied 2 months ago.
I pulled the flywheel today and the key is intact.
Expert:  Curtis B. replied 2 months ago.

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

Customer: replied 2 months ago.
I meant to say the key is intact. I pulled the flywheel today and it is intact.
Expert:  Curtis B. replied 2 months ago.

Yes, and then I asked about the valves.

Customer: replied 2 months ago.
reading up on how to do that
Expert:  Curtis B. replied 2 months ago.

Remove the rocker cover and see if they are working!

Customer: replied 2 months ago.
Finally was able to get back to my mower. Intake is .007, exhaust is .011. I assume both should be .006?
Expert:  Curtis B. replied 2 months ago.

Yes, ideal would be .006 inch.

Customer: replied 2 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.
Expert:  Curtis B. replied 2 months ago.

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

Customer: replied 2 months ago.
Plug is wet. I replaced the fuel pump too
Expert:  Curtis B. replied 2 months ago.

Plug is wet. Do you have good spark?

Customer: replied 2 months ago.
I have good spark
Expert:  Curtis B. replied 2 months ago.

Choke open, not flooding the engine?

Customer: replied 2 months ago.
The choke is open, set in the cold start position
Expert:  Curtis B. replied 2 months ago.

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

Customer: replied 2 months ago.
How do I determine that without tearing apart the carb?
Expert:  Curtis B. replied 2 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.

Customer: replied 2 months ago.
Float is good
Expert:  Curtis B. replied 2 months ago.

Cylinder still flooding?

Customer: replied 2 months ago.
Don't know about the flooding but it's getting gas
Customer: replied 2 months ago.
I swapped carburaors and it does the same
Expert:  Curtis B. replied 2 months ago.

Is exhaust plugged?

Customer: replied 2 months ago.
Good thought but definitely not.
Expert:  Curtis B. replied 2 months ago.

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

Customer: replied 2 months ago.
I did not check personally since I don't have a gauge but a friend checked and told me I was 105
Expert:  Curtis B. replied 2 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?

Customer: replied 2 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: replied 2 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
Expert:  Curtis B. replied 2 months ago.

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

Customer: replied 2 months ago.
How do I check that?
Expert:  Curtis B. replied 2 months ago.

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

Customer: replied 1 month ago.
It's unreasonable to even suggest I do that. I'm taking it to a JD repair center.
Expert:  Curtis B. replied 1 month ago.

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