Couple of questions

Mnmonster · Post by **Mnmonster** » 08:12 pm Mar 05 2016

Ok so I am a bad KDX owner. I bought my 220 about two years ago. Didn't ride it much at all the first year and only put About 20 hours on it last summer. I changed the oil and cleaned the air filter twice in that time and cleaned the carb once. Bike ran great so I put off everything and just decided to ride it. Well I have now decided to go through it a bit more before this riding season as I'm hoping to get some more seat time. I ordered a new wiseco top end kit and started to tear into the bike.

I pulled the plug for the first time since I have owned it (bad I know) and it is a b8es. Would there be a reason the po was running this plug? Here is a pic as well. Looks bad to me. Bike ran great tho.

I also tried to take a pic down the plug hole. Top of piston doesn't look great from what I could see.

So other than installing the new piston, what else should I be doing here? New to a lot of this stuff so I apologize for the newbness.

s10gto · Post by **s10gto** » 09:24 pm Mar 05 2016

Looks ok to me. Posibly a little rich but that's not a bad thing. B8es or BR8ES is correct plug.

Post by **Julien D** » 10:43 am Mar 06 2016

Yup, what s10 said.

You running the stock piston in that thing?

Jaguar · Post by **Jaguar** » 11:55 am Mar 06 2016

I think the chocolate brown color indicates correct fuel ratio and that the excessive accumulation was just due to the plug being used a long time without cleaning or replacement. Some accumulation on the piston is nothing to worry about either. I wouldn't worry about the piston and rings unless its been seized or your compression gauge is indicating a loss of compression.

Tedh98 · Post by **Tedh98** » 12:06 pm Mar 06 2016

If that is the stock 220 piston it would be a very good idea to replace it with a forged one.

Lots of posts on what happens to the stock 220 pistons here.

jjavaman · Post by **jjavaman** » 12:58 pm Mar 06 2016

He has a weisco piston on order.

Mnmonster · Post by **Mnmonster** » 01:07 pm Mar 06 2016

Yup, I'm aware. I have a wiseco ordered. Good thing too, because....

I'm pretty sure that's the stocker.

Here's how the head looked. Pretty clean.

And cylinder.

That's as far as I got today. Will pull the cylinder and put the new piston in when it arrives. Maybe a dumb question, but do I have to completely disassemble the kips system to do the top end?

I am boxing up my carb and head to send to RB this week as well since I've got it all apart

Tedh98 · Post by **Tedh98** » 02:40 pm Mar 06 2016

Mnmonster wrote: Maybe a dumb question, but do I have to completely disassemble the kips system to do the top end?

No.

pumpguy · Post by **pumpguy** » 02:57 pm Mar 06 2016

.........although I can't imagine the KIPS doesn't need a thorough cleaning.

JFortner5 · Post by **JFortner5** » 07:03 pm Mar 06 2016

pumpguy wrote:.........although I can't imagine the KIPS doesn't need a thorough cleaning.

X2. If you have it that far apart it would be worth going a little further and disassembling the KIPS and cleaning it.

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Mnmonster · Post by **Mnmonster** » 09:21 pm Mar 06 2016

JFortner5 wrote:
pumpguy wrote:.........although I can't imagine the KIPS doesn't need a thorough cleaning.
X2. If you have it that far apart it would be worth going a little further and disassembling the KIPS and cleaning it.

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Logically I know this is the right answer. But I really don't want to screw it up. It was working before I tore it apart.

Tedh98 · Post by **Tedh98** » 09:43 pm Mar 06 2016

Mnmonster wrote:Logically I know this is the right answer. But I really don't want to screw it up. It was working before I tore it apart.

It really isnt that difficult. It is just lining up marks and dots.

I think it is easier to screw up a top end than getting the KIPS timed correctly.

JFortner5 · Post by **JFortner5** » 10:10 pm Mar 06 2016

http://www.thumpertalk.com/topic/657765 ... to-kdx200/

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Mnmonster · Post by **Mnmonster** » 08:13 am Mar 15 2016

I shipped this out to Ron a week ago. Amazingly fast turn around time and his work looks great. Can't wait to put it all back together.

Mnmonster · Post by **Mnmonster** » 03:59 pm Mar 19 2016

Got it all back together today. The piston had a little bit of scoring, but was in pretty good shape otherwise. No cracks or anything in the skirt. Cylinder wall also looked ok. There were one or two very slight scratches that I could barely feel with my fingernail. Not enough to concern me, so I threw it all back together.

Kicking it over the first few times was very nerve racking as I had never done this type of work before. She fired up on the second kick and after I got the idle dialed in it seemed to run great. After a couple heat cycles I took it down the driveway a few times. Holy. ****. Power everywhere. Crisp throttle. Third gear power wheelies.

Now in addition to the new top end, I had my head and carb modified by RB and also installed some boyseen reeds. So I'm not sure how much each addition benefited alone but all of them together is just great. Can't wait to actually take it out in the woods.

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