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I recently purchased a Mtd 15.5 HP Lawn tractor with a

Customer Question
I recently purchased a...

I recently purchased a Mtd 15.5 HP Lawn tractor with a Tecumseh OHV155 model#204509E motor Ive been having Issues getting it to run properly. I've cleaned the gas tank replaced the fuel lines and filter. Replaced the carburetor . Replaced the float bowl and fuel solenoid, Replaced the Stator and spark plug. Adjusted the Valve springs. Checked for sheared pin. At this point I have the mower running but really rough. and wont throttle up without backfiring. I can get it to run a little better if I remove the air filter housing.

Mechanic's Assistant: What's the make and model of the mower? And can you guesstimate how old it is?

I'm guessing the year is around 99

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

I'm trying to just hitting a point I cant figurte it out hoping you can help

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

I think I included everything I can think of.

Submitted: 6 months ago.Category: Small Engine
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Answered in 2 hours by:
8/2/2017
Technician: Curtis B., Technician replied 6 months ago
Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 29,676
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 6 months ago

You set the valves a .004 inch? Do you have the old fuel solenoid from the carburetor? Take it and remove the working tip, and install it in the carburetor as a dummy, and run test.

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Customer reply replied 6 months ago
I did set the valves to .004
from my understanding i put a screwdriver in the spark plug hole and turn the motor till the screw driver is furthest out then set the lash. I randomly read somewhere to turn the motor an additional 1/4 turn then set lash does that habe and validity?
I had originally snapped off the solenoid pin on the original because it was broken, then when I ordered a new carburetor it came with a new float and solenoid. I also replaced the gaskets on the carburetor and intake
Technician: Curtis B., Technician replied 6 months ago

I would go back and check the valves again, turn till one valve is spring compressed, (open) and check the one that is up. Then if it is ok, turn till the ok one is spring compressed and check the other. You don't need to even remove spark pug!

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Customer reply replied 6 months ago
Ok
Adjusted the valves again they where fine.
Still sounding like the timings off
also found of I try to come it she dies
But I can jam two fingers in the intake shroud that holds the air filter and then she'll throttle up but still rough with black smoke
Technician: Curtis B., Technician replied 6 months ago

You are not getting enough fuel thrugh the carburetor. I would try the old fuel solenid , with the tip off, to see if it makes any differnce. Is this a gravity flow tank to he carburetor, or is there a fuel pump between? Is fuel pump working?

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Customer reply replied 6 months ago
Its gravity
I'll try to switch the solenoid pout
Technician: Curtis B., Technician replied 6 months ago

OK>

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Customer reply replied 6 months ago
Switched out the solinoids no better
I feel like it's getting plenty of fuel.
Technician: Curtis B., Technician replied 6 months ago

You are choking the engine, with hand, and making it run richer, the black smoke so it is not getting enough fuel through carb.

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Customer reply replied 6 months ago
I guess the reason I question that is when I choke it normally it doesn't do the same it just dies. I can also see excess fuel being spit out of the carb and pooling up in the base of the air cleaner shroud.
Technician: Curtis B., Technician replied 6 months ago

Did you remove the flywheel to check the timing key?

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Customer reply replied 6 months ago
Keys in tact
Technician: Curtis B., Technician replied 6 months ago

No damage?

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Customer reply replied 6 months ago
I pulled the entire flywheel of last week and it looked great
Technician: Curtis B., Technician replied 6 months ago

OK> I will opt out and see if someone else has seen this! Sorry.

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Customer reply replied 6 months ago
Thanks for the help
Hope someone is familiar with this situation
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Curtis B.
Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 29,676
29,676 Satisfied Customers
Experience: have worked on and around most engine models for 35 yrs./Polaris ATV expert

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