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I own a Gravely 0 radious lawn mower with a Kawasaki FH541V-KAI engine.Had some problems ,took it to dealer,had two valves,push rods,Ring sets on both sides,and a cam shaft on left bank only.I personally cleaned the carb,put new main jet,adjusted the high low speeds,new fule pump,blew out lines and checked gas caps and even left them lose to make sure.The pilot screw doesn't seem to do any thing turning it full either way. The problem is since I got it back the engine surges or lopes with the excelator rod and governer arm together, bounce up and down,weather at idol or full open high speed.The only thing I have ben able to rectafi this is to set the choke about 3/4 closed.Delema---What do you think?? Docwayne docwayne@windstream.net

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  • docwayne Jul 17, 2009

    Air filter on or off engine,with or without doesn't make any difference.

  • docwayne Jul 18, 2009

    I own a Gravely 0 radious lawn mower with a Kawasaki FH541V-KAI engine.Had some problems ,took it to dealer,had two valves,push rods,Ring sets on both sides,and a cam shaft on left bank only.I personally cleaned the carb,put new main jet,adjusted the high low speeds,new fule pump,blew out lines and checked gas caps and even left them lose to make sure.The pilot screw doesn't seem to do any thing turning it full either way. The problem is since I got it back the engine surges or lopes with the excelator rod and governer arm together, bounce up and down,weather at idol or full open high speed.The only thing I have ben able to rectafi this is to set the choke about 3/4 closed.Delema---What do you think?? Docwayne docwayne@windstream.net

  • docwayne Jul 18, 2009

    Would that cause the governer arm,which the throtle and governer spring atatches to ,to bob up and down causing surge or radical pulsing???

  • docwayne Jul 20, 2009

    I will check all these points.Best solutions so far ,thanks.

    PS. No, i don't get any response from the pilot screw,but yet I can see daylight through it.Hmmm?

    I'll get back to you on it later.Right now I'll hqave to use it for two jobs.I have a small lawn service,and no back up except a push mower.:-( I only hope it doesn't do any damage bein as how I should run at full throtle under load for cooling perposes.

  • docwayne Jul 21, 2009

    I own a Gravely 0 radious lawn mower with a Kawasaki FH541V-KAI engine.Had some problems ,took it to dealer,had two valves,push rods,Ring sets on both sides,and a cam shaft on left bank only.I personally cleaned the carb,put new main jet,adjusted the high low speeds,new fule pump,blew out lines and checked gas caps and even left them lose to make sure.The pilot screw doesn't seem to do any thing turning it full either way. The problem is since I got it back the engine surges or lopes with the excelator rod and governer arm together, bounce up and down,weather at idol or full open high speed.The only thing I have ben able to rectafi this is to set the choke about 3/4 closed.Delema---What do you think?? Docwayne docwayne@windstream.net

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You have a leak somewhere carburator or jets are loose.

Posted on Jul 21, 2009

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Did you check the float height? If it drops too far down the carburetor will flood. Too far up it starves.
I think it may be too far up. Installed height? Level with the mounting flange for the float bowl cover.

Pilot screw. Which is the Idle Air adjust screw. No response? Sounds like there is junk down in the Idle to mid-range circuit. See if you can blow this passage out with air. I've had some circuits in the carburetor that I've had to remove the lead soft plug, and use a drill bit to clean them out! (YES, it kinda puts you on edge! I'm a machinist also, so everything works out)

Do you get a response from the Main Jet screw?

Another thing comes to mind. If the wrong camshaft was installed for the left bank, this would cause an uneven surge. Let's say the cam lobes have too much lift, or too much duration. Plus the lobe center separation must be correct. Also, what if this camshaft was installed one tooth off? It's hard to pinpoint what is the cause, without actually being there, and observing.

Not installing a spring, or if it's the usual progressive type setup for the spring, (Generally two springs in one. As the first spring is stretched to a certain point, the second spring comes into play), not installing it correctly, will allow the governor vane to move freely.

Posted on Jul 19, 2009

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If you are having to close the choke slightly to smooth the engine out, the fuel mixture is lean. The fuel metering orifice has foreign material obstructing it.
I would suggest purchasing a bottle of "sea foam", mix it in your gas tank as directed on the bottle and run several tanks through it. The cleaner will remove any built up varnish or debris that is trapped in the very small fuel metering channels located in the carburetor.
I use it myself as a yearly maintenance prevention.
Good luck, let me know how it goes.
Regards,

Posted on Jul 18, 2009

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Carb will need to be pulled off, pulled apart, soaked in solvent for a few hours, gasket, reinstall and set pilot 1 1/4 turn from seat. Make sure floats are completely clean. And double check needle and seat to see if the are worn or bent.

Posted on Jul 20, 2009

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Try to put a simply screen filter over the existing paper filter.

Something like a fine fishing net or a hair net will so.

The paper filter is under-size and the location is too low to the ground.

It can pick up dirt.


Try the screen method first and see does it help the engine ran smoother.

If it works OK then look for a larger filter.

Posted on Jul 17, 2009

  • Vincent_G
    Vincent_G Jul 17, 2009

    Do you have a good mower shop near by.

    Ask the for a hotter plug.

    Gap it one notch closer. (your own judgment call)


    Get an automotive chemical mix call Seafoam. (WHITE CAN)
    Add few oz into the gas and oil to free up the rings.


    Get some fresh gas just in can your gas you're using is losing octane.







  • Vincent_G
    Vincent_G Jul 18, 2009

    One last thing to try is Seafoam additive.

    It can go into 4 cycle oil and gas.


    It use it in my car and diesel engine. It does help at lot.

    ==
    Another good additive is call Lucas fuel treatment.

    I have not check the MSDS yet but it make my small engine ran smooth.





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check your engine model #
all fh641v series 675 cc 21 hp

Specs: HP cc Bore x Stroke

FH480V 16HP 472cc 68mm x 65mm
FH541V 17HP 585cc 74mm x 68mm
FH580V 19HP 585cc 74mm x 68mm
FH641V 21HP 675cc 75.2mm x 76mm
FH680V 23HP 675cc 75.2mm x 76mm
FH721V 25HP 675cc 75.2mm x 76mm

FH641V 21HP 675cc 75.2mm x 76mm 41.19 cubic inch

there must be differences in the valves and carb sizing / jetting to make engines put out more hp similar to briggs with their engines

When asked for serial, I.E. AS01, BS01, etc., the lower the letter, the newer the engine. It doesn't really matter, except for maybe spark plug reach or other subtle changes

A quick explination of how to tell how big a Kawi is the model number. Those ending in 0 are the rough displacement (cc's) of the engine, those ending in 1 are a up or down hp version of the 0's in the same family.

here is good website for any parts -:
http://www.ereplacementparts.com/kawasaki-fh641vas04-stroke-engine-parts-c-30157_30211_32002.html

cheers pauly46

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