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  #1  
Old 03-10-2005, 01:24 AM
rbig rbig is offline
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Location: pensacola fl
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why are plugs failing?

I've got several mowers with twin cyl engines, as well as a couple with single cyl engines. Seems like I frequently have plugs go bad.

When I pull 'em and look at them, they show pretty normal, and no signs of heavy fouling like you'd expect to see with plugs that quit working. Cleaning the things doesn't seem to help. New plugs get me going again.

What I do is keep a good supply of several changes of each kind of plugs I use on hand. Fortunately, plugs are relatively inexpensive, so it's more of an annoyance than a real problem.

Has anyone else experienced this scenario? I've wondered what is causing the failures.
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  #2  
Old 03-10-2005, 07:45 AM
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rockytopp rockytopp is offline
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plugs failing

I do believe that as with many things in the repair work, the quality of control has gone out the window. I find this in auto parts as well. Seems that mexico and other parts that are imported are made to make the manufactur money and control is the last thing they care about. Parts that used to be rebuildable are now throw away, so the pride and care that once was standard has been lost. This is a sad situation but I am afraid here to stay.
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  #3  
Old 03-11-2005, 01:08 AM
CCWKen CCWKen is offline
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You didn't say how long they're lasting. I replace plugs on the tractors twice a season. (Just started last week here.) The push mowers, trimmers and saws get a set per season. I could probably push the tractors to a set a season too but the power and economy take a real hit towards the end of the season. It's worth it, in fuel savings, to keep the engines running at peek power.

The problems with small engines are heat and fuel delivery. Neither are controled very well and this takes a toll on spark plugs. Like you say, they are cheap but they can give a tired engine new pep in an instant. Sharp blades and new plugs save a lot of gas! When you go through about 50gal. a month, a 30-50% savings adds up in a hurry! Especially at $2.00 a gallon.
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  #4  
Old 03-15-2005, 09:14 AM
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sawman65 sawman65 is offline
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i bet you have kawasaki engines dont you???
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  #5  
Old 03-15-2005, 09:31 AM
rbig rbig is offline
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Most of our engines that are having plug failures seemingly too often are Kawasaki
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  #6  
Old 03-15-2005, 01:32 PM
LawnScapers of Dayton LawnScapers of Dayton is offline
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my Kawi's will foul plugs...especially in cool weather.......

Derek
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  #7  
Old 03-15-2005, 08:41 PM
Guthrie&Co Guthrie&Co is offline
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i would check my fuel source. might want to try a diffrent fuel source
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  #8  
Old 03-19-2005, 08:39 AM
Mower Man Mower Man is offline
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Location: Mid Atlantic State
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Kaw's coils aren't the best. Quietly, their upgrading.

Choke settings MUST BE done as per the instructions using a 'set pin', and followed line by line.
If not done as per instructions choke setting will be off.

If using an "associated choke" thats when throttle & choke are combined...it's even more important.

Recoil starts have been somewhat balky in cool-colder weather.
Using a good 10-30W makes pulling easier....higher RPM which creates better coil induction....for higher voltage.

Check oil for gas in it. When pulling over alot, and it doesn't start fuel can thin out the crankcase oil.
Use the sniff test. If suspected.....carefully away from any fuel source, using a match-lighter stroke the dip stick. Stroke---not too much, not too close.
If flame gets larger, or oil 'puff' ignites, there is fuel in the crankcase.

Two starters are available.
Standard torque & high torque.

Standard uses a seperate starter solenoid NOT mounted (piggybacked) to the starter. Follow Positive (Red) cable from battery to a black colored object that has 3-4 terminals.
Have seen these solenoids from water-moisture get inside---corrodes contacts which reduces electrical flow. R & R, coat terminals with dielectric grease after assembly, and use boots on BOTH terminals if they point straight up.

High torque is usually a silver colored large round shaped Bendix style mounted on the starter. It provides about 200 more starting RPM.
It's an option that costs alot more, so many mower companies don't spec it.

Kawa's should have valve clearances checked as per Maintenance schedule. Very important to starting, and operational efficiency.

Have seen fuel deposits (hard crystalline mustard color) form on the fuel bowl float jet, and metering jets.
Sometimes using a engine fuel system cleaner helps.
Sometimes only physically removing works.
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  #9  
Old 03-27-2005, 11:01 PM
topsites topsites is offline
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Location: Richmond Virginia
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Quote:
Originally Posted by rbig
I've got several mowers with twin cyl engines, as well as a couple with single cyl engines. Seems like I frequently have plugs go bad.

When I pull 'em and look at them, they show pretty normal, and no signs of heavy fouling like you'd expect to see with plugs that quit working. Cleaning the things doesn't seem to help. New plugs get me going again.

What I do is keep a good supply of several changes of each kind of plugs I use on hand. Fortunately, plugs are relatively inexpensive, so it's more of an annoyance than a real problem.

Has anyone else experienced this scenario? I've wondered what is causing the failures.
YEAH! I found out you need to make sure you get the special lawn-mower 2-cycle plug. In my case I was using automotive plugs made for cars which cross-referenced at the auto-parts store, and these things kept fouling.
Make sure when you go to the auto-parts store, you tell them it's for a lawn-mower as the plug will cross-x to a car-plug when they look it up on the computer and that is wrong.

Funny thing ... The auto-plug's thread and firing element is black while the 2-cycler is all silver in metal color.
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  #10  
Old 03-27-2005, 11:23 PM
Teiman Teiman is offline
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Join Date: Mar 2005
Location: Lebanon Ohio
Posts: 103
Mower Man

Thanks, just bought a used machine with a 23 Kaw FH
(270 hrs) it blows tons of whiteish smoke for about 40 seconds
on start up, smoke smells like fuel not oil. Choke off as soon as it fires, and
the CC oil definitly stinks of fuel. Seems to burn clean after a minut or two.

I think you gave the answer to my problem, No ?
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