KIPS rattle with a new MUCH louder rattle...help me out guys (with video and pics)

Discussion for swapping a KDX motor in a MX frame...
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B737driver
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Re: KIPS rattle with a new MUCH louder rattle...help me out guys (with video and pics)

Post by B737driver » 07:13 pm Jan 05 2019

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Piston
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Re: KIPS rattle with a new MUCH louder rattle...help me out guys (with video and pics)

Post by B737driver » 07:17 pm Jan 05 2019

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Re: KIPS rattle with a new MUCH louder rattle...help me out guys (with video and pics)

Post by B737driver » 07:19 pm Jan 05 2019

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Maybe a little blow by where the upper ring comes together.
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Re: KIPS rattle with a new MUCH louder rattle...help me out guys (with video and pics)

Post by B737driver » 07:29 pm Jan 05 2019

Anyway, that's what I've got. Going to rebuild the bottom end and work on the air boot to carb junction a bit more.
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Re: KIPS rattle with a new MUCH louder rattle...help me out guys (with video and pics)

Post by KDXGarage » 11:25 pm Jan 05 2019

Yeah, maybe the left seal is leaking:

send off crankshaft for connecting rod kit
new mains and seals
new piston
new rings
new gaskets
new coolant and engine oil

GOOD TO GO

The little lines look like dirt scratches on the piston and cylinder.

If there is aluminum streaking on the cylinder walls, read up on muriatic acid.
Thank you Julien D for all your hard work!

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Re: KIPS rattle with a new MUCH louder rattle...help me out guys (with video and pics)

Post by SS109 » 10:23 pm Jan 10 2019

I'm really curious about the crank damage. Did you explode a piston at some time?
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Re: KIPS rattle with a new MUCH louder rattle...help me out guys (with video and pics)

Post by B737driver » 11:01 am Jan 11 2019

I was surprised at the look of it as well. No history of broken pistons. I've done multiple top ends through the years and never noticed this, but I really wasn't looking. The bottom end was always good.....till it wasn't that is.

I looked at some images of other KDX cranks and surprisingly saw similar marks (metal apparently missing) in the exact same area. Based on this, I'm trying to convince myself that it may be normal.

Update: Dropped the bottom end off with my mechanic. He thinks that the races on one of the main bearings is coming apart and fortunately I caught it before the bearing completely came apart. I hope to get pics when he splits the cases.
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Re: KIPS rattle with a new MUCH louder rattle...help me out guys (with video and pics)

Post by KDXGarage » 11:40 am Jan 11 2019

If you are seeing the same thing, then it may very well be.

OFF TO THE RACES!! :-)
Thank you Julien D for all your hard work!

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Re: KIPS rattle with a new MUCH louder rattle...help me out guys (with video and pics)

Post by Julien D » 03:43 pm Jan 11 2019

Nice, I hope it all gets worked out. I would like to see those if you do get pics.
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