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  #1  
Old 08-17-2012, 05:48 AM
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lotsagrass lotsagrass is offline
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Kawasaki FH770D 28HP sputtering under heavy load

I have a previous generation eXmark Lazer Z with the 28HP Kawasaki FH770D KAI. Over the last month (I only use it about 1 per week) I've noticed that under a heavy load, such as stopping on a hill with the blades engaged and then starting to go up the hill again, the engine will sputter a little. It seems to be getting a little worse now and to me it sort of sounds like it's starving for fuel. It runs great otherwise and only has less than 100 hours on it. I put a new fuel filter on early this year as part of normal maintenance. So when I looked down at the fuel filter to see how much gas was in it while the engine was running full speed with the blades engaged, I was surprised to see only a small puddle of fuel at the bottom of the filter. I would have thought it would be mostly full. The question is, how full should that fuel filter be when you look at it with the engine running full speed? Maybe the fuel pump is going bad? Though it has less than 100 hours on it, this mower was a leftover and sat unsold for close to 3 years before I bought it. Not sure if that has any affect on the fuel pump condition. My idea was to go the easy route and replace the fuel pump to see if that's the problem. Make sense? Is it abnormal for that fuel filter to only have a small pool of fuel at the bottom??? I would have thought it should be at least half full or more if the pump was working well.
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  #2  
Old 08-17-2012, 07:49 PM
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lotsagrass lotsagrass is offline
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Anyone? Fuel pump?
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Old 08-17-2012, 08:02 PM
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piston slapper piston slapper is offline
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Fuel filters are hard to read...sometimes they look empty and work just fine..
Changing the fuel filter...as well as the sparkplugs ...would be good to do to a 3 year old machine...
The crap they are selling us for fuel causes its own problems....
Try a fuel additive and a better grade of fuel...
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Old 08-18-2012, 01:32 PM
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lotsagrass lotsagrass is offline
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Quote:
Originally Posted by piston slapper View Post
Fuel filters are hard to read...sometimes they look empty and work just fine..
Changing the fuel filter...as well as the sparkplugs ...would be good to do to a 3 year old machine...
The crap they are selling us for fuel causes its own problems....
Try a fuel additive and a better grade of fuel...
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I replaced the filter this spring and if I recall correctly I put new plugs in too. I went ahead and replaced the fuel pump today and I thought it was fixed. The first 5 minutes or so was great but then it started doing it again. I took it into some thick grass and it sputtered like crazy. As soon as I was out of the thick grass it ran perfectly. It was overgrown grass I used for testing this problem. I used high octane (93) fuel all the time.

Could it be related to the governor?
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Old 08-18-2012, 02:16 PM
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Landrus2 Landrus2 is offline
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A good carb cleaning would be a good and en-expensive way.
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  #6  
Old 08-18-2012, 02:40 PM
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lotsagrass lotsagrass is offline
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Quote:
Originally Posted by joesimoes2 View Post
A good carb cleaning would be a good and en-expensive way.
Thanks. I was thinking of trying that next. Maybe just run a high quality carb/fuel system cleaner in the gas on the next run.
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Old 08-18-2012, 02:55 PM
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piston slapper piston slapper is offline
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Go ahead and remove the sparkplugs....check the condition...
They may lead you to the problem..
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Old 08-18-2012, 05:31 PM
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lotsagrass lotsagrass is offline
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Quote:
Originally Posted by piston slapper View Post
Go ahead and remove the sparkplugs....check the condition...
They may lead you to the problem..
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I checked the plugs today. They look great. Very clean. I confirmed that I did change the plugs with new NGK plugs this spring. I found the old boxes I kept to get the right part number again next time.
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Old 09-12-2012, 11:20 AM
taxidermist taxidermist is offline
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Quote:
Originally Posted by lotsagrass View Post
I checked the plugs today. They look great. Very clean. I confirmed that I did change the plugs with new NGK plugs this spring. I found the old boxes I kept to get the right part number again next time.
Try another brand plug.......this is a common problem with NGK plugs under a load I once had a ferris come in to the shop just like mine and I swapped parts until I found a bad plug. I took out the bad plug and put it in my mower and it did the same thing. I changed both plugs to a champion and no problems since.

I like NGK plugs and I use them..... but i have had them go bad and also a bad one from the start.

Cant hurt to try.

Rob

Last edited by taxidermist; 09-12-2012 at 11:28 AM.
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  #10  
Old 09-12-2012, 03:37 PM
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lotsagrass lotsagrass is offline
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I just checked the coils with an Ohm meter with the coils still attached to the engine. From looking at the service manual, the only check I can't do is the check between the kill wire connection and the other terminals.

From my understanding, position A in the illusatration is the part that's grounded to the engine so using the engine itself should get me to that one....and the plug wire is the one marked C in the illustration, correct? So I should be looking at the reading between A & C? If so, I think my readings are fine for the coils. Well within the specs listed in the book which is a range between 14k and 24k, right?

I put my notes on my actual readings in the yellow box below. Can you confirm that this looks ok to you too?

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