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Message started by georgekathe on 01/01/07 at 22:35:59

Title: fouling plug
Post by georgekathe on 01/01/07 at 22:35:59

this might seem a basic question - if so sorry, but in years of riding have never had it come up/have to potentially deal with one.

was told by a mechanic it would be easy to foul a plug & if so, it would mean getting a new plug.

might have done this (was told by mechanic bike should fire up, run on choke & then close choke after a very short period to avoid fouling plug.

know they don't cost a fortune, but what is wrong with drying it out if it has fuel on it, clean it with a wire brush (in old days was basic way I got more life out of plug) & carefully reset gap.

so - can I do this or do I have to buy a new plug?

Title: Re: fouling plug
Post by geo on 01/01/07 at 23:02:16

Get the new plug. My God it is only one!
Get the NGK Iridium for piece of mind.

I used to get fouled plugs in the old days of 2-stoke engines. This 650 is a big bore engine like you have in your car, so spark plug fouling is not common.

Anytime you go through the work of pulling your tank off, I suggest you replace the plug. Check the condition of the old one. Use a good anti-ceize compound on the threads each time to pull the plug out.

You could wire brush the electrodes as we did for cars in the old days, but why? After all the work, go to a new plug, it is only one.

Title: Re: fouling plug
Post by klx650sm2002 on 01/02/07 at 00:55:21

NGK DPR8EIX-9 0.6mm center electrode
Denso IX24B 0.4mm center electrode

Clive W :D

Title: Re: fouling plug
Post by lancer on 01/02/07 at 08:05:10

I have replace the plug on my bike every 2000 miles or so just as a matter of course.
I had one plug foul on me shortly after being installed ... I assume it was just a bad plug that made it through the production process ... once replaced the engine fired right up.
A good reason to keep some spares on hand.

Title: Re: fouling plug
Post by PerrydaSavage on 01/02/07 at 08:42:52

I pull my tank and change out the plug every Spring before the start of Riding season ... figure it can't hurt to have a fresh plug to start a new season!
BTW ... all the ones' I've pulled out, seem to have been in good overall shape ... just slightly sooty ... prob due to our cooler weather in Spring and Fall, where I have to run the Bike on 1/2 choke for a couple of kilometers after starting, to warm her up!

Title: Re: fouling plug
Post by mickthelimey on 01/02/07 at 09:35:38

Hey George, I got a new name for you "Scrooge" ;)
yes back in the old days I used to rotate about 4 or five plugs ,take one out sand blast it and put it in your tool box ,use the one you took out few weeks ago and so on.
I havn't had that problem since using iridiam plugs though,I thought you used them as well?

Title: Re: fouling plug
Post by georgekathe on 01/02/07 at 11:06:56

hey mick - I prefer frugal! like I said on other entry in repsonse to other entry from other person on site I tried iridium & did not notice much difference & recently when went to hotter plug changed (back) to non Iridium.

OK, I'm shamed into it - will buy an new plug, though like Mick as an old hand @ riding British bikes in 60s/70s used to just wire brush or otherwise recycel them & keep using same one for ages!

darn, even though I'm used to it by now I hate pulling the tank - never had to on my 81 Yamaha SR500 single.

thanks for input everyone! ;D

Title: Re: fouling plug
Post by Savage_Rob on 01/02/07 at 11:13:06

Now you may want the plug door mod. I haven't done it yet myself but it does have its allure.

Title: Re: fouling plug
Post by justin_o_guy on 01/02/07 at 11:43:40

I did the plug door when I stuck the iridium in during the Trapp install. I know I am gonna want to be looking at the plug during tuning the carb to the Trapp. I stuck a piece of heat shrink on the nub sticking up to help stop any buzzing if the head cover gets against it.