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Need to tune up old lawn mower

Need specs on spark plug gap, setings for idle and rich/lean screws for a kawasaki engine
john deer lawn mower JD906
another number stamped on engine was 890408

thanks-- cody

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SOURCE: John Deere 14SB mower with Kawasaki FC150V series - Throttle adj.

Hello rfbarrett:

From your Description it Sounds like the Plate that is Attached to the Carburetor (that the Throttle cable Attaches to) Thru Shaft (holds and Moves the Throttle Valve) has Loosened and is Simply Turning on the Thru Shaft and Not Moving the Thru Shaft and Throttle Valve at All.
>>You can View a Breakdown/IPL of the Engine and Mower at this Site Addy, and Enter the Model Numbers 14SB and Click Find. Then Select your Model from the Search Results Area. Then Select the Sectional File. Then Select the Section of the Mower you Wish to View Online. *You can Drag the View Windows for Better Viewing.*
Please, Do Not Hesitate, If I Missed Something or you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance.
Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Be Happy. Thanks.

Good Luck


jbridger (John)

Posted on May 14, 2009

  • 386 Answers

SOURCE: what is the spark plug gap for a 6.5 craftsman

.025 "

Posted on Aug 11, 2009

  • 143 Answers

SOURCE: 4.5hp B&S engine on a bolens mower..won't idle steadily

This is called hunting, your fuel-air ratio is not right. Your carb. jets need cleaned

Posted on Sep 05, 2009

Testimonial: "Thanks...always get great advice on here...."

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SOURCE: John Deere LT155 Lawn Tractor has trouble going uphill

u can change belt yourself need belt size and have to remove cutting deck but check belt tension first if loose with brake off belt stretched out and slipping needs replacement

Posted on Sep 29, 2009

  • 78 Answers

SOURCE: blade belt diagram for John Deere LX178 Riding

Remember the belt rule, V of the belt goes in V pulleys.Flat pulleys that are stationary or move get the back of the belt. You can figure it out. Its not rocket science. Remember at some point there has to be a tensioner,usually gets the back of the belt if its a flat pulley. U may have to remove the spring and then reattach the spring after the belt is routed.

Posted on Oct 29, 2009

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I have a John Deere JS30 self propelled lawn mower I had issues with it running for 15 minutes and then it stops running. Was low on oil. Added oil over the full line now it runs for 3 min and dies

Wayne, correct your oil level to full line, change your spark plug and try mower. If still acting up after a couple minutes, the Gas cap vent may be plugged, remove or loosen cap to see if mower will run longer and better. If no improvement, the carburetor is dirty and needs cleaned or rebuilt.
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Lawn-Mower won't start

Hi, when your Lawn mower is not starting, follow the steps and instruction below to troubleshoot and fix it.. <br /> <br /> <b>Engine seized</b> If you are unable to pull the start cord or if the electric starter will not cause the engine to turn over you may have a seized engine. Check the oil level, if there is no oil in the crankcase the piston may have become fused to the cylinder wall. Spraying a penetrant or lubricant into the cylinder through the spark plug hole can sometimes loosen the piston otherwise it is likely the engine will need extensive repair work. <br /> <br /> <b>Battery dead</b> Check the battery to make sure it is completely charged. Also check the cables to make sure they are tight and the battery posts are clean. <br /> <br /> <b>Spark plug fouled or defective</b> The spark plug may be loose and need tightening, the spark plug wire may be damaged or disconnected, or the spark plug may be clogged with oil, gas, and combustion residue. If it is clogged it can be cleaned with a wire brush. You may also need to reset the spark plug gap. The spark plug gap can be checked and adjusted with a spark plug gauge to measure the gap between the center electrode and ground electrode on the end of the spark plug. Check the required specifications in the owner's manual. If it's badly damaged, replace it. <br /> <br /> <b>Recoil broken</b> If you pull the recoil starter assembly and it pulls too freely or doesn't retract after pulling it there may be a broken or jammed spring, pulley, or cord. If the cord retracts but pulling the rope doesn't crank the engine, you will need to remove the recoil starter assembly to determine the cause of the problem. <br /> <br /> <b>Air-fuel mixture</b> Small engines need the proper amount of air and fuel (14:1) in order to start or run properly. An air-fuel mixture that is too lean (too much air) burns hotter and may cause rough idle, hard starting and stalling and a lot of misfiring. Check the choke to make sure it is not stuck in the open position otherwise the carburetor may need to be cleaned or adjusted. An air-fuel mixture that is too rich (too much fuel) is usually due to a dirty or clogged air filter or the choke being stuck in the closed position. The choke should be in the closed position when starting a lawn mower, however if the choke remains closed the engine will not start because the fuel and air mixture is too rich. <br /> <br /> <b>Oil into carburetor and/or combustion chamber</b> Oil can leak into the carburetor if the lawn mower has been tipped on its side (carburetor is not up in the air). If this happens the carburetor must be completely cleaned out using a brush or rag and a spray or liquid carburetor cleaner. <br /> <br /> <b>Starter switch or motor</b> If there is only a click sound when trying to start a lawn mower with an electric starter there may be a problem in the electrical system. Use a multimeter to test the starter switch, alternator and any other electrical component. Check the owner's manual for meter settings, speed, and readings.

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2 Answers

What is the spark plug gap supposed to be?

If you enter your model number (and serial number if you have it) at the link below, you'll have access to your owner's manual which will tell you what your spark plug gap should be.
Hope this helps.

Operators Manual

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1 Answer

Where is the spark plug?

The spark plug will be located on the engine under a rubber "boot". Remove this boot and you will see the spark plug. The boot is attached to the spark plug wire, you should be able to spot it pretty easily.

Grip the boot and pull it off, it will have a little resistance, but it should come off with no problem.

You will need either a spark plug wrench or a deep socket wrench to remove the spark plug itself.

Only use the tool the loosen it, then use your fingers when you can.

Good Luck!

I've added a link to a post about how to change the spark plug on a lawn tractor, unfortunately, it is not John Deere, but it should be very similar!

How to Change the Spark Plugs on Simplicity Broadmoor Lawn Tractor

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Black smoke indicates rich mixture. Dirty air filter. choke stuck on. loose main jet in carby. just a few possibilities.

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I have a Master cut 3.5 , the spark plug is not with the mower and we cannot remember the spec of the spark plug !!! Any idea

If that is a 3.5 HP Briggs Engine you're referring to then I believe you want a (Champion) CJ8 plug. Cross-references to the following mfg's:
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. Hope this helps

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I have a john deere 285 lawn tractor that smokes and cuts out at high throttle. It will idle though. The fuel pump will squirt accross the garage so its fine. I have taken the carberator off and...

It sounds like it is too rich in fuel at full throttle.
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