How often should you change spark plug?


24 replies to this topic
  • CaptainKnobby

Posted May 31, 2007 - 06:24 PM

#1

I was wondering how often one should change their sparkplug?>>> I have had mine in for about three months now and it has 8 races on it along with practice days also. Should I change it out every so often or leave it in until it fouls? My bike 06 450 is running great so should I just leave it in or put a new one in it?

  • 642MX

Posted May 31, 2007 - 07:24 PM

#2

I put one in once a year, which is also when I check my valves. I use the goofy looking CR8EK also.

  • grayracer513

Posted May 31, 2007 - 07:39 PM

#3

When change mine when I can't remember when I put the last one in. If I were running a serious race bike, I'd probably use 2-3 per year, just to be sure I had no problems with it.

  • Garett742

Posted May 31, 2007 - 08:14 PM

#4

when your bike wont start

  • Idaho_Stas

Posted May 31, 2007 - 08:24 PM

#5

when your bike wont start


X2 :thumbsup:

  • BergArabia

Posted June 01, 2007 - 03:17 AM

#6

Had over 100 hours on mine and no change of plug yet..
Still starts after 2 kicks so yeah when it doesn't start I would put in another.

  • 642MX

Posted June 01, 2007 - 05:42 AM

#7

The problem with using a plug until it won't start is a worn plug with too much gap will put too much burden on your ignition system. For what the plug costs, it should be changed at least yearly.

  • stillsun

Posted June 01, 2007 - 06:45 AM

#8

The problem with using a plug until it won't start is a worn plug with too much gap will put too much burden on your ignition system. For what the plug costs, it should be changed at least yearly.


One year on a bike plug is probably equivalent to 1/4 year in an automobile... I bet if you measured the gap on the bike plug after a year of normal riding (once a week for a few hours, like the majority of the people who ride) it would be just fine. Granted they are cheap to begin with so why not...

J

  • 642MX

Posted June 01, 2007 - 08:08 AM

#9

One year on a bike plug is probably equivalent to 1/4 year in an automobile...


I don't think thats an accurate statement. I guess we could do an experiment to find out when the gap goes out of range....

  • grayracer513

Posted June 01, 2007 - 08:24 AM

#10

One year on a bike plug is probably equivalent to 1/4 year in an automobile... I bet if you measured the gap on the bike plug after a year of normal riding (once a week for a few hours, like the majority of the people who ride) it would be just fine. Granted they are cheap to begin with so why not...

J


I don't think thats an accurate statement. I guess we could do an experiment to find out when the gap goes out of range....


I have to agree. The plugs in my Chevy Pickup will go to 40-50K easily. Bikes are much harder on them, and the wear at the electrode gap is far from the only issue. Plugs subjected to hard acceleration on a regular basis build up a glaze on the insulator that eventually becomes conductive, and is very difficult to remove. Plus the deterioration of the internal resistor, considering the plug is fired nearly 7 times as often per hour of operation.

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  • GCannon

Posted June 01, 2007 - 01:31 PM

#11

I have to agree. The plugs in my Chevy Pickup will go to 40-50K easily. Bikes are much harder on them, and the wear at the electrode gap is far from the only issue. Plugs subjected to hard acceleration on a regular basis build up a glaze on the insulator that eventually becomes conductive, and is very difficult to remove. Plus the deterioration of the internal resistor, considering the plug is fired nearly 7 times as often per hour of operation.


Not to mention the vibration the plug is subjected to!

  • 2wheels-drz

Posted June 01, 2007 - 03:15 PM

#12

im pretty sure my 04 has only ever had two in its life...but have seen yamaha's which need a plug every race day....must be bad jetting. still better than need a set of valves like a honda....

  • 426boy

Posted June 01, 2007 - 06:59 PM

#13

after i have been riding hard for a few days straight, if my bike sits for a few days then it sometimes fouls the plug, so it gets a new one when that happens

  • Garett742

Posted August 27, 2007 - 11:55 PM

#14

leave it

  • WB450

Posted August 28, 2007 - 07:31 AM

#15

X2 :thumbsup:


I ran in to that last night. After a while of garage starts (hot here) it wouldn't start last night. I pulled the tank and changed it. The old one was kinda rusty and a little black. I put it all back together and it started right up.

What are you guys carrying on the trail for plug wrench? Where did you get it?

  • rmracer27

Posted August 28, 2007 - 01:24 PM

#16

I change mine everytime I check the valves which is around 15 to 20 hours.

  • Thomas6x

Posted August 28, 2007 - 04:13 PM

#17

[quote name='Garett742']when your bike wont start[/QUOTE


X3 :p

We raced our yz400 for 3 years hard,broke every thing else.but never changed the plug,kept the jetting right.Had a drag bike that had to have new ones every 5 or 6 passes, would just start missing.But have never changed one in our 4 stk dirt bikes since we started in 2001.:applause:

  • 642MX

Posted August 28, 2007 - 04:23 PM

#18

What are you guys carrying on the trail for plug wrench? Where did you get it?


I got my plug wrench from Yamaha. It came with the bike....

  • Butta

Posted August 29, 2007 - 08:15 PM

#19

I change mine when I start feeling guilty, usually about 50 hours.......thanks to this thread, I think it's about time now....

  • grayracer513

Posted August 30, 2007 - 07:59 AM

#20

What are you guys carrying on the trail for plug wrench? Where did you get it?

Motion Pro plug wrench for the YZF. Nice little tool; rubber lined socket, comes with its own swivel extension, and the extension gives you three different options as to what to use to drive it with.

Local Bike Shop item.





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