Top end problem

KANixon · Post by **KANixon** » 08:24 pm May 02 2009

My 2006 KDX 200 is making a rattling noise and I think its piston slap.

How do I go about fixing this? Can i replace the cylinder and the piston, or am I gonna have to bore it out?

Post by **Julien D** » 05:29 am May 03 2009

You'll have to get a look at it before deciding. If it's been maintained, you should only need to replace the piston and rings. You'll have to at least get the head off to check the condition of the plating in the cylinder though.

canyncarvr · Post by **canyncarvr** » 07:43 pm May 03 2009

Does the rattling noise change when you pull the clutch?

Does it make the noise just sitting there or at a particular rpm/throttle?

KDXs rattle. If the clutch actuation changes it...that's it.

Oil quantity spec is 700ml. Put in a quart..it will quiet the racket and won't hurt anything (like some punkins that puke and quit running with too much oil in 'em).

If the plating is good...you don't bore it. It's not an iron sleeved cylinder..there are no 'oversize' pistons in the sense of 'boring it out' during the process of a top-end.

If you DO bore it..you have to replate it...well HAVE it replated. It's not something you do in your garage.

GS · Post by GS » 01:28 pm May 05 2009

Is that a new noise?

KDXs RATTLE....more than any bike I've ever owned....and they rattle when they're healthy, too!

Does the rattle change at all?

canyncarvr · Post by **canyncarvr** » 01:51 pm May 05 2009

Here's the way it goes:

There's a new guy on a forum. He asks a question..a best case of a bad example of one, even.

He gets an answer.

There is no response.

No one bothers posting any answers to his questions any more.

And that's the way it is................

Post by **Indawoods** » 02:07 pm May 05 2009

I was out of town...

canyncarvr · Post by **canyncarvr** » 02:12 pm May 05 2009

Oh. So it's YOU!

KANixon · Post by **KANixon** » 11:05 pm May 05 2009

canyncarvr, it rattles when its idling, and when i pull the clutch in, the tone of the rattle changes a bit. Also, it was a little low on oil, refilled it and it seems to me that was the problem. While the rattling is still there its not as bad as before.
when the rattling got worse,I assumed the worst. It sounds like you were right. I really appreciate your help and your insight.

Thanks,

Nixon

GS · Post by GS » 11:38 pm May 05 2009

Easy to be fooled by THAT rattle!!

tcat992 · Post by **tcat992** » 12:03 am May 06 2009

Does'nt the KIPS rattle on these things also, my KDX250 does not rattle, better call Ripleys, but my neighbors kid has a KX 100 that rattles nasty and we cant seem to find the cause.

canyncarvr · Post by **canyncarvr** » 01:47 am May 06 2009

KANixon wrote:canyncarvr, it rattles when its idling, and when i pull the clutch in, the tone of the rattle changes a bit. Also, it was a little low on oil, refilled it and it seems to me that was the problem. While the rattling is still there its not as bad as before.
when the rattling got worse,I assumed the worst. It sounds like you were right. I really appreciate your help and your insight.
Thanks,

Nixon

..when idling..

That's not piston slap.

What you got is the sound of a happy KDX!

Just ride it!

Cheers!

MXOldtimer · Post by **MXOldtimer** » 09:49 am May 06 2009

One nice thing about get'n old is.............. I can't hear a damn thing anymore. Piston slap, KIPS rattle, hell I couldn't hear the rod coming out the side of the cylinder. I probably wouldn't notice it either unless I had my read'n spec's on.

What noise, what oil, my bikes run'n fine!

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Top end problem

Top end problem