Spark plug half black half white

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Kawasakirooster
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Spark plug half black half white

Post by Kawasakirooster » 07:36 pm Jun 29 2020

Just put a jd jet kit as per recommended on my 2000 kdx 220,runs well idles down really low which tells me idle jetting is good but falls flat in high revs,when I rev it in neutral up high sounds loaded up like the choke is on,pulled the spark plug,insulater is half black half white,not sure what to make of this

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bufftester
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Re: Spark plug half black half white

Post by bufftester » 08:46 pm Jun 29 2020

What is your AS set to? As I remember the JD kits only came with mains and needles, so the pilot would need to be checked. Run through the jetting checklist and you'll have better luck than randomly changing things.

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Re: Spark plug half black half white

Post by Kawasakirooster » 05:20 pm Jun 30 2020

Just checked my air screw it's slightly over one turn out,also put a new jet block gasket in ,that alone made it run better

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Re: Spark plug half black half white

Post by SS109 » 07:31 pm Jun 30 2020

I would need to see a pic of the plug to get an idea on what's going on. I'm personally not fond of the JD jetting kits. I mean, they're a good ball park setup that will normally make your bike run ok but not as good as going through the steps to properly determine your jetting.

That said, have you followed the jetting guide to dial in your JD kit instead of using their recommendations in the instructions?
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doakley
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Re: Spark plug half black half white

Post by doakley » 07:57 pm Jun 30 2020

Let’s back up just a bit. Was that absolutely positively up to operating temp before you tried to rev it up? I ask because mine, along with others I know, is very cold natured. I let it warm up gently then ride it around gently to be sure it is thoroughly warm. If I don’t it breaks up like you described. When thoroughly warm it is , pardon the pun, “ready to race!”

Point being, never try to jet a bike that isn’t thoroughly up to operating temp.

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Re: Spark plug half black half white

Post by KDXGarage » 08:13 pm Jun 30 2020

doakley wrote:
07:57 pm Jun 30 2020
“ready to race!”
Image
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Re: Spark plug half black half white

Post by SS109 » 10:05 pm Jun 30 2020

Never " ready to race" but "race ready"! :boogie:
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Re: Spark plug half black half white

Post by Kawasakirooster » 11:52 am Jul 01 2020

It was at operating temps,all this was after about an hour and a half ride on a new plug washed the bike then idled for about 5 minutes while using a leaf blower to dry it while it was running,then revved it to clear it out

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Re: Spark plug half black half white

Post by doakley » 04:31 pm Jul 01 2020

KDXGarage wrote:
08:13 pm Jun 30 2020
doakley wrote:
07:57 pm Jun 30 2020
“ready to race!”
Image
Hahaha! I figured that would get a rise !

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Re: Spark plug half black half white

Post by Kawasakirooster » 06:55 pm Jul 01 2020

So here is a pic of the he plug

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Re: Spark plug half black half white

Post by Kawasakirooster » 07:00 pm Jul 01 2020

Kawasakirooster wrote:
06:55 pm Jul 01 2020
So here is a pic of the he plug

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Re: Spark plug half black half white

Post by KDXGarage » 01:37 am Jul 02 2020

doakley, thank you, kind sir.

OP: viewtopic.php?f=88&t=24128
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Re: Spark plug half black half white

Post by treelimb » 06:36 am Jul 02 2020

What is the 10-20 on the plug picture?

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Re: Spark plug half black half white

Post by Kawasakirooster » 07:04 am Jul 03 2020

IMG_20200630_211305970

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Re: Spark plug half black half white

Post by Kawasakirooster » 07:13 am Jul 03 2020

Sorry for the delay,work is busy,I don't know this pic posting is not going the way your post says, no option to place in line, tried dragging,hence the result you see

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Re: Spark plug half black half white

Post by KDXGarage » 10:19 am Jul 03 2020

What kind of device are you using?
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Re: Spark plug half black half white

Post by Kawasakirooster » 07:02 pm Jul 03 2020

It's an android,motorola phone

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Re: Spark plug half black half white

Post by KDXGarage » 09:06 am Jul 04 2020

1593871460144-1797901766.jpg
1593871460144-1797901766.jpg (2.46 MiB) Viewed 108 times
It is working for me using Android Samsung. I am not sure what is going on.
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