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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 28069
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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I have cub cadet with kohler sv590, it cranks but I am

Customer Question

I have cub cadet with kohler sv590, it cranks but I am unable to start it
JA: Do you have fuel in the tank? If so, is the shut-off valve open and the fuel clean?
Customer: yes full and there is no shut-off
JA: Do you plan on doing the work yourself?
Customer: yes i have been working on this thing last 4 days and best I got was flames out of the carb
JA: Anything else we should know to help you best?
Customer: as i crank and open the throttle the more I open harder it cranks
Submitted: 9 months ago.
Category: Small Engine
Expert:  Curtis B. replied 9 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 9 months ago.

When did it last run? You have good spark with plug removed and grounded while cranking? Do you have good compression? Check by holding finger with rag over the spark plug hole while cranking. If it has spark and compression, put a teaspoon of fuel into the spark plug hole, and re-install the spark plug to see if it will start for a few seconds.

Expert:  Curtis B. replied 9 months ago.

Service manual link above!

Customer: replied 9 months ago.
I am very sorry but I had to leave the house. I will get back to you in about an hour or so.
Expert:  Curtis B. replied 9 months ago.

OK>

Customer: replied 9 months ago.
Hi there I am back with the same question.
I have cub cadet with kohler sv590, it cranks but I am unable to start it
It was used about a month ago. As of right now it has spark and fuel with very strong compression.
Customer: replied 9 months ago.
Text is fine.
Customer: replied 9 months ago.
Anybody there
Expert:  Curtis B. replied 9 months ago.

When did it last run? It has compression , but all the valves moving if you remove the rocker cover and check?

Customer: replied 9 months ago.
About a month ago, has nice spark and strong compresion
Expert:  Curtis B. replied 9 months ago.

Valves may not be opening.

Customer: replied 9 months ago.
adjusted the valves to specs
Customer: replied 9 months ago.
I took the top cover off and found governor gear broken, I replaced it with new one but no luck
Expert:  Curtis B. replied 9 months ago.

Did you move the crankshaft or camshaft that would have displaced the internal timing?

Customer: replied 9 months ago.
Did not, took it apart to check ARC mechanism but put it back together by the spec.
when cranking the engine on fully open throttle it cranks really hard and slow
Expert:  Curtis B. replied 9 months ago.

If not, I would check the crankshaft to flywheel key.

Expert:  Curtis B. replied 9 months ago.

Does it crank easily with spark plug removed?

Customer: replied 9 months ago.
Did that as well took flywhell off and replaced the key
Customer: replied 9 months ago.
it dose crank easily with spark plug removed
Expert:  Curtis B. replied 9 months ago.

Then it is out of time.

Customer: replied 9 months ago.
But I did adjust the timing by specs. Took cover of and alined the cam gears with marks on the shaft
Expert:  Curtis B. replied 9 months ago.

Has to be either the internal timing or the flywheel key.

Customer: replied 9 months ago.
how do I check Internal timing
Expert:  Curtis B. replied 9 months ago.

Only way is to go back into the engine and recheck!

Expert:  Curtis B. replied 9 months ago.

I assume the battery voltage is good and the cables and starter are good!

Customer: replied 9 months ago.
its all good
I rechecked the internal timing like 3 times. I even took ARC off and still nothing
Customer: replied 9 months ago.
I mean there is no magic to it but I guess I must be missing something
Customer: replied 9 months ago.
I have not yet tried to put the fuel in to cylinder but I used starting fluid instead
Expert:  Curtis B. replied 9 months ago.

If it were hard to turn with spark plug out, the pulley on the lower crankshaft could be binding the crankshaft, but you say it turns ok. Starting fluid should have at least let it try to run.

Customer: replied 9 months ago.
It spited flames true the carb
Customer: replied 9 months ago.
right out
Expert:  Curtis B. replied 9 months ago.

That tells me you have a valve open when the spark occurs, which has to be valves or timing.

Customer: replied 9 months ago.
I agree
Customer: replied 9 months ago.
the pulley on the lower crankshaft how do i check on that
Expert:  Curtis B. replied 9 months ago.

Just loosen the pulley.

Customer: replied 9 months ago.
I am not sure. You mean the pulley under the mower
Expert:  Curtis B. replied 9 months ago.

Yes.

Customer: replied 9 months ago.
I am working on it right now. Will be like 5 min
Expert:  Curtis B. replied 9 months ago.

OK>

Customer: replied 9 months ago.
Ok took pto and drive belt off and it cranks a lot easier . Sprayed some starter fund to the cylinder cranked it and she suited flames right out of carb.
Expert:  Curtis B. replied 9 months ago.

OK, so it still has issues with timing. To loosen the lower pulley you need to add shim between pulley and crankshaft, to give it more clearance.

Customer: replied 9 months ago.
The lower pull your sits on the shafts free of any obstruction and spins as shafts do
Customer: replied 9 months ago.
What is the point of removing the pully
Expert:  Curtis B. replied 9 months ago.

If you have no clearance on the pulleys, they take away all the crankshaft thrust and make shaft hard to turn. If you have crankshaft thrust, it is not a problem.

Customer: replied 9 months ago.
Ok I am working on it. It's kind of tight
Customer: replied 9 months ago.
Got pulley loose away from engine but is still on the shaft
Expert:  Curtis B. replied 9 months ago.

You are going to need it off to go back into the engine.???

Customer: replied 9 months ago.
Ok this will take a while
Expert:  Curtis B. replied 9 months ago.

yes, I don't expect to finish this today!