Question about kawasaki Fh641v 21hp 21 Hp Riding Lawn Mower Engine ()

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How to adjust a carburater on fh641v 21 hp kawasaki lawnmower engine

Spark plug is black

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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kel1guy2002
  • 3740 Answers

SOURCE: 21 hp kawasaki stalls and

Seems odd that after changing carbs you have this symptom but a dirty air cleaner or restiction in the air intake ducting can cause this. I note you said you changed the air filter(s). I am assuming you changed both the paper and foam filters. My thoughts are maybe there is some gasket material partially blocking the intake under the carb so when under load it is acting like the Choke is on. ( Before you go lifting off the carb.. a partially engaged choke valve will do the same thing. It will run just fine at low speeds or little load but when you put a heavy load it will choke out / get too much fuel.

Last thing that can cause the engine to act really weird is that the gas cap is vented and if the vent is clogged in the gas cap it will cause very unstable operation of the engine at higher rpms.

Your engine service manual is here:
http://www.smallenginewarehouse.com/images/manuals/FH641-Service.pdf
Carb informationis in section 2 - 8

I reommend you inspect
- the tank cap (no plastic bag in place of the rubber under the gas cap to prevent the tank from leaking)
- the choke linkage and position of choke valve (Off or partially on?)
- screen if any under the air filter (Thinking out of the box... what if the air filter is being drawn against the air cleaner / filter housing causing a choke situation under load)

Don't do this for very long but try a high load test with the air filters removed.

One last dumb thought is... the fuel pump is ported to the engine crank case breather. If the diaphragm fails it can put fuel in the oil which will cause the oil level to rise due to the added gas and then end up over pressurizing the crank case. (You said you changed the oil.. and I would think the oil level is still the same as it was post oil change.)

Those are my thoughts and recommendations for the moment. If anything else come to mind I will send you another post.

If you have questions feel free to ask. I wll tell you that I am using the service manual and my 40 + years of experience to help you.

Thanks for choosing FixYa,
Kelly

Posted on Mar 28, 2011

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philwalker78
  • 608 Answers

SOURCE: Kawasaki fh641v -- appears the

Symptoms are caused by the engine running lean. Clean the fuel system including blowing out all jets in the carby. Regards Phil

Posted on Apr 17, 2011

  • 6468 Answers

SOURCE: 23 hp kawasaki engine will not fire- I have spark at the plug. Plugs wet. installed new plugs. Intake into carberator is full of gas.

check the operation of the valve on the bottom of the carb

Posted on May 10, 2012

  • 6468 Answers

SOURCE: 21 HP kawasaki engine hard to start

might be time for a good carb cleaning

Posted on May 12, 2012

  • 6468 Answers

SOURCE: coil adjustment on 21 hp kawasaki engine

i put a piece of a brown paper bag between the coil and the flywheel magnet

Posted on Sep 04, 2012

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Hot fire one coil and orange fire on other


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1 Answer

How do I determine horsepower by serial number?


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. 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. 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. all aa





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

May 22, 2011 | kawasaki Fh641v 21hp 21 Hp Riding Lawn...

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