KX 500 Flat on Mid and top end

[lsampson]

One more thing, is the stator woodruff key seen simply by removing the left cover, or how would I go about that?

[lsampson]

Well Boys And Girls, I Rode The K5 And It Ran Like A Raped Ape! I Noticed When I Put Her Back Together That The Reed Cage Was Installed Upside Down(The Arrow Was.up) So Between The Valves, Old Fuel, Reeds, And Top End, Something Did The Trick!

But....

I Did Notice That WIth The New weisco Piston, It Rattles Alot At Idle. During Insallation, I Checked The Ring End Gap And It Was Within Specs (0.030"). Do Wiseco Pistons Slap At Idle Until They HeaT Up? It Did Quiet Down Some Once It Was WarM, But It Was Still Present. Thanks Gents.

[sandblaster]

Hmmmm.
For a stock set up you are .002" past the service limit:
1987-2004 New .15-.35mm or .006-.014" Service limit .7mm or .028"
I know Motorrad had some problems with getting rings from Wideco that were in spec.
Sounds like that hasn't changed any.
The rattle.... I'm wondering if you could use the kipps bolt mod....
I know my bike needed it after I put in a new piston.

[Motorrad]

What was your piston wall clearance..


End gap should be half that..   Makes me think hole is too big...   So loose piston wall.  Thus. Rattle

[sandblaster]

Thats why they call them Wideco now   

[lsampson]

Sorry, I Meant .30 mm

[lsampson]

As For Piston Clearance, I Totally Forgot To Measure That. Oops!.I Think I Will Tear It Back Down. The Rattle Is Pretty distracting. I Did Do The Kips Bolt Mod.

[Motorrad]

As For Piston Clearance, I Totally Forgot To Measure That. Oops!.I Think I Will Tear It Back Down. The Rattle Is Pretty distracting. I Did Do The Kips Bolt Mod.

kips are noisy anyways.

listen to this one rattle.    and I can GARONTEE its right.  (beyond right).  its shimmed,  machined, etc to perfect.

http://s13.photobucket.com/user/Motorrad/media/DSCN1214_zpsa8f1783a.mp4.html

[sandblaster]

Man, that thing is crisp....

[lsampson]

Ill have To Listen To It Tomorrow, My Phone Is Jacked Up. The Rattle Is LoUd, Louder Than The Exhaust (At Idle)

[motopunk]

Man, that thing is crisp....

the sound of a perfekt 2 stroke motor... 

[lsampson]

Motorad, after listening to that clip, it is the same sound, but mine is louder, and I only noticed it after the rebuild, which i suspect is because I switched from a stock to a wiseco piston. I am not sure what to do. The rattle annoys me, so I'm leaning on replacing the new wiseco with a new OEM piston and rings.  Is there any chance that when I cleaned up the exhaust valves I gave them more slop and they are whats rattling? What would you guys do?

[Motorrad]

Motorad, after listening to that clip, it is the same sound, but mine is louder, and I only noticed it after the rebuild, which i suspect is because I switched from a stock to a wiseco piston. I am not sure what to do. The rattle annoys me, so I'm leaning on replacing the new wiseco with a new OEM piston and rings.  Is there any chance that when I cleaned up the exhaust valves I gave them more slop and they are whats rattling? What would you guys do?

the clean valves will rattle.


if its the same sound as the video.   its not piston.  (there is no piston to be heard in that video).   that is 100% kips ratte.

Mine is quieter than most due to all the work I have done to them.

[lsampson]

what kind of work can I do to quiet mine down? The valves seem good (no excessive wear), but I can move the center valve flapper up and down with the exhaust pipe off. Is that where the rattle is? Do you guys typically use OEM pistons? I just don't want to pass it off as ok and have to rebuild the top and bottom end of the bike because I messed something up

[Motorrad]

Do you guys typically use OEM pistons?

That is a hotly debated topic depending on who you ask.

ask me.   Forged only goes back in my bikes.  

what kind of work can I do to quiet mine down? The valves seem good (no excessive wear), but I can move the center valve flapper up and down with the exhaust pipe off. Is that where the rattle is?

when you say you can move it up and down...   how much we talking? 6" or ?


do you have any tension on the kips acuator rod  (via the kips arm) ?    there should be some tension on the system.


There is lots of work that can be done    mine for example, are Re-shaped on the flow areas,  the ramp angle is messed with on mine.,     roughly .030" taken off the top's  to pull them higher in the cyl,  and everything is shimmed to perfection.. kips acuator rod re-cut,  run a differant kips arm for better leverage and ratio for kips bolt mod,  as well as a "messed with" kips drum (spring shim stack etc))...   Im sure somone will post a link to my motor thread.