what do i need to know about the 27hp kohler

[grass disaster]

i just bought a new everride warrior with the 54" deck and a 27hp kohler. machine has .2 hours on it. i have yet to start it. it's still in the crate.


can someone tell me some basics about this motor. i've had a 18hp kubota diesel before this and never had to worry about anything motor related.


things such as.........

how long should i let it warm up?
what throttle position should i start?
what throttle position shoud i shut off motor?
do i need to let it idol before shut off?
do i need to get valves adjusted often?
----i'm sure i'm missing some questions.


please fill me in on some basics...... kohler 101 if will :confused:

[Stillwater]

confirm their is oil in the motor before you start it

[lifetree]

Questions --

how long should i let it warm up ?
what throttle position should i start ?
what throttle position shoud i shut off motor ?
do i need to let it idol before shut off ?
do i need to get valves adjusted often ?


Answers --

Warm up ... about 1 minute.
Start position ... choke.
Shut off position ... full throttle.
Idle before shut off ... no.
Adjust valves ... no.

[Albery's Lawn & Tractor]

Answers --

Warm up ... about 1 minute.
Start position ... choke.
Shut off position ... full throttle.
Idle before shut off ... no.
Adjust valves ... no.

Are you searious. NEVER SHUT A MOTOR DOWN AT FULL THROTTLE!!!:hammerhead:
Always let it idle down before shutting it off as well.

This should be common sense. The 27 Kohler is a great motor, has proven durability, good power, and it's not to bad on gas either. Good luck.

[GravelyNut]

Are you searious. NEVER SHUT A MOTOR DOWN AT FULL THROTTLE!!!:hammerhead:
Always let it idle down before shutting it off as well.

This should be common sense. The 27 Kohler is a great motor, has proven durability, good power, and it's not to bad on gas either. Good luck.
Two worst things for an engine:
1.) Wide open on startup
2.) Shutdown from WOT.

[sawman65]

Read Your Manual!!!!

[Lawdog302]

There is nothing wrong with shutting this engine down at full throttle. It is recommended to shut down at half to full throttle to eliminate backfiring. Sounds like some people do need to read manuals.

The fuel shut off solenoid on the on the carb kills all fuel entering the engine. The engine needs the high speed momentum to blow all remaining fuel out the exhaust so there is nothing left to ignite. Also since the oil pump is driven by the crank, it is constantly being supplied with oil with the key on or off.

[JimQ]

I guess I agree with not starting the engine at WOT but what is the logic behind not shutting it down at WOT? Some of you guys seem emphatic about it. What am I missing here? Why shouldn't you shut it down at WOT?

Q

[Albery's Lawn & Tractor]

What is the logic behind shutting it down at wide open throttle? Do you shut your car off at 3500 rpms? No so why would you do it to a mower?

[JimQ]

Here's the logic... I think :)

On a small engine without a fuel shut-off solenoid, if you were to shut is down (kill the ignition), it would continue to pull fuel from the carb and load the cylinder(s) and muffler with fuel. This might load up the plug(s) and/or result in a BOOM as the muffler explodes the next time you fire it up.


With a fuel shut-off solenoid, when the ignition is killed, so is the fuel flow from the main jet in the carb.

I think the real answer to this question is this:

On a 27hp Kohler (with fuel shut-off solenoid) don't worry about what RPM you shut it down at. A good rule of thumb for small engines..... Don't shut them down at WOT

Q

[Lawdog302]

What is the logic behind shutting it down at wide open throttle? Do you shut your car off at 3500 rpms? No so why would you do it to a mower?

Read post #7

[Stillwater]

oh god this is getting silly, the only advice this guy needs is to read his manual. Back fire is caused by a hot intake and unburnt fuel. Shutting down at full rpm is stupid. I certinly don't want that stress and heat on my valve set. If you dont have the patients to idle for 15 seconds before shut down then don't post#7 the logic behind shutting down at 1/2 throttle is to coddle the type who have no paients to shut down after a short cool down.

[Albery's Lawn & Tractor]

Read post #7

#7 is complete BS. Why don't you guys call your local repair shop and ask them? The motor needs a chance to cool down before you kill it. With the Kohlers if you don't let them idle for atleast 15 seconds, then you get the backfire. By the responses on here I asume most of you guys don't work on your own equipment.

[MowerMedic77]

Your mower is not a car. Do you run your car @ 3600rpms all day long? I would not recommend start up at full throttle because of a lack of lubrication in the upper part of the engine but can you explain what damage could be done by shut down at full throttle?

All of the computer controls meter the air/fuel ratios on your modern vehicles, so fuel requirements are handled by a computer at any given rpms/load/temp range. You are running a twin cylinder carburated air cooled engine in most cases fed fuel by a vacuum style fuel pump.

Almost all the big engine manufactures have gone to the Twin cylinder engine(Kohler,Kawi,Briggs,etc.) with the fuel shut off solenoid or (anti-backfire solenoid). I have heard from all of them at the update classes that they require being shut down at 3/4 throttle(I tell my customer to shut them down@this range). This is how these engines are designed to work the solenoid does shut the flow of fuel first and this lets the cylinders and exhaust time to clear out any unspent fuel that would otherwise detonate in the hot cylinder/exhaust(backfire). I would tend to think an untimed detonation would cause more damage to an engine then a operator shut down at higher rpms.

[Stillwater]

#7 is complete BS. Why don't you guys call your local repair shop and ask them? The motor needs a chance to cool down before you kill it. With the Kohlers if you don't let them idle for atleast 15 seconds, then you get the backfire. By the responses on here I asume most of you guys don't work on your own equipment.

THANK YOU...

[MowerMedic77]

http://www.kohlerengines.com/service/faq.html

Scroll down to WHY DOES MY ENGINE BACKFIRE WHEN I SHUT IT OFF?

Hey but what do I know I just fix them all day long.................

[Stillwater]

I did read it and the question was never answered

[MowerMedic77]

I did read it and the question was never answered

Wow, lets see if you idle the engine it loads up with fuel:hammerhead: Ok here some more info for ya.(1st one I could find but will look for more)
from the Kohler 2005-2006 Tech. Service Update Program (top of pg#13)


After fire on CV25-Powered Consumer Tractors

Some OEMs have failed to add our recommeneded shut down procedures to their owner's manuals causing after fire complaints. Adding a governed idle to their CV Twin specs has alleviated most of the complaints,HOWEVER,EVEN WITH THE GOVERNED IDLE, THE ACCELERATOR PUMP ON THE CV25 CAN INJECT ENOUGH FUEL TO CAUSE AFTER FIRE IN SOME CASES.

I have now showed you two examples of why you should from the MANUFACTURE of the engine and I have yet to see anything on your end(other then opinion)that shows me why you should not follow the manufactures recommended shutdown procedure.

[Albery's Lawn & Tractor]

[url]

Hey but what do I know I just fix them all day long.................

So do we. We have a seperate repair business aside from our mowing.

[MowerMedic77]

So do we. We have a seperate repair business aside from our mowing.

Well then I guess as part of being a Kohler dealer someone at your shop would have to take the yearly update and hands on courses and pass the test so that you can continue to get paid for warranty repairs. This has been covered and is common knowledge. The V-twins with the solenoid do not get idled down. I am not making this stuff up it comes from the manufacture:hammerhead:

Once again I am waiting for anything other then your opinions:sleeping:

[Restrorob]

I am not making this stuff up it comes from the manufacture:hammerhead:

Once again I am waiting for anything other then your opinions:sleeping:

I was trying to sit this one out because I KNEW where it was going to go soon as it was posted, But.......

Everything MM has posted is known FACTS as per KOHLER'S "recommended" PROPER shut-down procedures on fuel cut-off solenoid equipped engines.

As already stated all one has to do is READ your owner's manual and you will find this;

Stopping
1. Remove the load by disengaging all PTO driven
attachments.
2. For Carbureted Engines Without A Shutdown
Solenoid: Move the throttle to the ‘‘slow’’ or
‘‘low’’ idle position. Allow the engine to run at
idle for 30-60 seconds; then stop the engine.
For Carbureted Engines Equipped With A
Shutdown Solenoid: Position the throttle control
between half and full throttle; then stop the
engine.
For EFI Engines: Move the throttle to the "slow"
or "idle" position; turn key "off" to stop engine.

Now, Grant it....One can shut their engine down any way they want, BUT the above procedure is what Kohler "recommends".

[tamadrummer]

Directly from my owners manuals:
John Deere G15 36" Walk Behind (gear drive)
As Mower Medic states for Kohler Command Pro 15: Stopping the engine:

Slowly move the throttle to 3/4 and turn off key

As for my 727a 54" 23hp V-twin Kawasaki

Move throttle lever to 1/4 fast position and run for 30 seconds, and then move to slow position.

Then turn off engine.

On a side note I was surprised to see that both manuals require that these engines be at 1/2 to 3/4 throttle to be started. I started my Z on low and the WB on 3/4 because it won't start otherwise and then ramped it down but now I won't do that.

Another great thread and even though many of us think or thought we knew it all, this got me to read the most basic of info and I learned something! Thanks to the thread starter and to all posters in here!

[Stillwater]

*trucewhiteflag*............

[Lawdog302]

#7 is complete BS. Why don't you guys call your local repair shop and ask them? The motor needs a chance to cool down before you kill it. With the Kohlers if you don't let them idle for atleast 15 seconds, then you get the backfire. By the responses on here I asume most of you guys don't work on your own equipment.

Thanks for the comment, but I wonder if you work on equipment yourself? Any body that reads the manual can find this stuff out. Sounds like old school thinking to me.