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

2 Answers

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

Spark plug is black

Posted by Anonymous on

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If spark plug is black then engine is running too rich (all fuel no air) firstly check the air filter is really clean. If ok then you will need to remove carb strip down and clean

Posted on Jan 23, 2019

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE:

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

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Good luck!

Posted on Jan 02, 2017

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

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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1 Answer

CHANGING SPARK PLUGS ON A 2002 LINCOLN LS


Generally in a spark plug is 60000 kilometers, if fuel is bad need in early, remove the spark plug, such as for auburn or rust color, spark plug showed normal; Such as stained with oil, shows that the spark plug gap imbalance or too much oil, high tension line short circuit or open circuit; Such as black smoke, spark plug type cold wrong or mixture is thick, the oil is up; Such as the top between the electrode and sediment, when for the oily sediment, shows that the cylinder into the oil has nothing to do with the spark plug, when the black sediment, spark plug carbon deposition and bypass, when grey sediments, is a gasoline additive covered electrode lead to lack of fire; If serious erosion, such as the scar at the top, with black pattern, electrode melt, showed that the spark plug is damaged.
hope help you -auto diagnostic tool

Apr 02, 2013 | 2002 Lincoln LS

Tip

No Spark at plug on 4 cycle lawn mower engine


1) How have you determined that there is no spark?
2) Have you used a type of spark tester?
3) What is the condition of the plug. Brown or dark brown is OK. Black or silver is NOT Ok.
*If you do not have a spark tester,
a) remove the plug, and with it connected to the wire,
b) find a portion of metal around the cylinder that you can ground it on, and then pull the rope.
c) If the plug is black, you may see spark, but you should replace the plug.

*** PLEASE NOTE ; if there is excess fuel in the cylinder or on spark plug,
it can catch fire, so be carefull to cover the hole with a heavy rag so that any fuel
cannot be exposed to spark plug during test !!!!

on Dec 04, 2009 | Garden

2 Answers

Spark plugs are black on my Harley


Hi Anonymous, and the usual suspects are:
1. Plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition or leaking.
3. Spark plug gap to close or to wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discarged.
6. Damaged wire or loose connections at battery terminals especially the ground cable at "BOTH" ends, ignition coil, or plug between ignition sensor and module.
7. Intermittent short circuit due to damaged wire insulation.
8. If your bike has a CKP sensor you must leave both plugs in
head and check for spark with a 3rd plug. Good luck and have nice day.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Apr 01, 2013 | 2003 Harley Davidson FXSTDI Softail Deuce

1 Answer

Have a skilsaw 1616 chainsaw that will not crank. Cannot tell if it is firing or not. do not know how to test the lead to the spark plug from the black box (don't know what it is called) the wire is...


Remove the spark plug wire, remove the spark plug, reattach the spark plug wire to the spark plug, ground the threads or the flats the socket engages to to the engine. While grounded, pull the recoil starter and you should hear a popping and see a spark. May not see the spark if done in bright light, like direct sunlight.

Aug 12, 2011 | Garden

2 Answers

I have a 2000 kia sprtage. i need to replace the spark plugs. They appear to be hidden. How do i get to them?


There is a tunnel intake tube,remove it,but there is a black plastic vacuum reservoir on the back connected to it,remove it first,it is not easy to do,after these are out of the way,the black plastic cover that goes down the middle of the valve cover has the coils,two of them,and two wires,and four spark plugs under it.If this was at all helpful,please rate,and thank you.

Jul 04, 2010 | Cars & Trucks

1 Answer

Heater not starting , think the spark plug connector is not working. Is it possible to run straight to the spark plug and bypass the black box. 55000 btu keryosen heater.


the black box the wire that comes from it and goes to the spark plug is the ignition module,no you cant bypass this or there wont be any spark,make sure though that when unit is powered up theres 120 volts at the input of the black box,(where the power goes into) the box,not on the spark plug wire side either

Mar 13, 2010 | Reddy Heater-30-55,000 BTU Variable

1 Answer

No spark at the spark plug. Kohler 16 hp


1) How have you determined that there is no spark?
2) Have you used a type of spark tester?
3) What is the condition of the plug. Brown or dark brown is OK. Black or silver is NOT Ok.
*If you do not have a spark tester,
a) remove the plug, and with it connected to the wire,
b) find a portion of metal around the cylinder that you can ground it on, and then pull the rope.
c) If the plug is black, you may see spark, but you should replace the plug.

*** PLEASE NOTE ; if there is excess fuel in the cylinder or on spark plug,
it can catch fire, so be carefull to cover the hole with a heavy rag so that any fuel
cannot be exposed to spark plug durning test !!!!
Get back with me on how this issue works out.
thanks, rwvanlue

I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae

Dec 04, 2009 | Craftsman Garden

1 Answer

My stihl chainsaw has no spark. spark plug is new


1) How have you determined that there is no spark?
2) Have you used a type of spark tester?
3) What is the condition of the plug. Brown or dark brown is OK. Black or silver is NOT Ok.
*If you do not have a spark tester,
a) remove the plug, and with it connected to the wire,
b) find a portion of metal around the cylinder that you can ground it on, and then pull the rope.
c) If the plug is black, you may see spark, but you should replace the plug.

*** PLEASE NOTE ; if there is excess fuel in the cylinder or on spark plug,
it can catch fire, so be carefull to cover the hole with a heavy rag so that any fuel
cannot be exposed to spark plug durning test !!!!
Get back with me on how this issue works out.
thanks, rwvanlue

I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae

Nov 16, 2009 | Garden

2 Answers

Do not know where to connect hour meter wire to the spark plug


One wire is the flexible silicone rubber wire from the spark plug to the ignition coil. You don't have to strip or connect the other wire, just wrap it around the spark plug wire a few turns.The current from the spark ignition will induce a signal into the hour meter that the meter uses to determine when the motor is on or off. I hope this helps and good luck.1b05a64.jpg

Oct 28, 2009 | 2006 kawasaki KX 250 F

1 Answer

Spark Plug location


Yes sir! Those four square black modules are the distributor caps for the spark plugs - ie they distribute the high voltages to the plugs to ignite your gas that makes your car go :)

Be careful when you're unscrewing the plugs - there is likely grease, oil, or dirt around them and knocking any of this through the spark plug hole down into the cylinder is potentially damaging to the engine. Best of luck!

Sep 18, 2008 | 2004 Toyota Camry

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