Maintenance & Technical > KX500 Original

Engine Knock

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Pmcg:
Todd rebuilt, balanced, and welded the crank. I really hope that's not the issue. I only hear it when the bike warms up. Which makes me think pre detonation.

Foxx4Beaver:

--- Quote from: Pmcg on September 07, 2016, 07:36:48 AM ---It's a pronounced knock.

--- End quote ---

ugh...I asked, cause you didn't really give a clear description in the original post.


--- Quote from: sandblaster on September 07, 2016, 07:54:18 AM ---Doah no.... Sounds like a crank rod...

--- End quote ---

unfortunately, I agree...the bottom end needs to be investigated, unless of course by some miracle, you find something whilst removing the top-end.

I could be mistaken, but I thought you had a new crank in this thing?

Pmcg:

--- Quote from: Foxx4Beaver on September 07, 2016, 08:06:59 AM ---
--- Quote from: Pmcg on September 07, 2016, 07:36:48 AM ---It's a pronounced knock.

--- End quote ---

ugh...I asked, cause you didn't really give a clear description in the original post.


--- Quote from: sandblaster on September 07, 2016, 07:54:18 AM ---Doah no.... Sounds like a crank rod...

--- End quote ---

unfortunately, I agree...the bottom end needs to be investigated, unless of course by some miracle, you find something whilst removing the top-end.

I could be mistaken, but I thought you had a new crank in this thing?

--- End quote ---

Crank is new. I would think the bike would knock all the time if it was a bad crank not just when warm.

Foxx4Beaver:

--- Quote from: Pmcg on September 07, 2016, 08:03:59 AM ---Todd rebuilt, balanced, and welded the crank. I really hope that's not the issue. I only hear it when the bike warms up. Which makes me think pre detonation.

--- End quote ---

if Todd did it...it should be good....
try some race fuel, see if it goes away....but if it doesn't, plan on disassembly. :x

sandblaster:
+1

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