Maintenance & Technical > KX500 Original

KX 500 Flat on Mid and top end

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cbrfrenzie:
Typically Wiseco states their PTW clearance on the box the piston comes in.  Usually these specs are different than OEM, to account for the different thermal expansion rates of the two materials (cast vs forged).

lsampson:
So..... I Figured Som Stuff Out Tonight. The Piston That came Out Of The Bike Has A "C" stamped On The Crown, And Fits Tighter Than The Wiseco. I Do Not Have Ash Inside Micrometer So I Couldn't Measure The Bore, But The Old Oem Piston Measures 85.94Mm And The New Wiseco Measures 85.84Mm. The WIseco piston-Cylinder Clearance Is .127 Mm, And Spec Is .100Mm. So I Have A Larger Bore. I Have Not Seen An Oem Piston sold In A "C", Where Are They Available?

lsampson:
"C" Stands For Cast...Doesn't It... :cry:

motopunk:
http://www.wiseco.com/ProductSearch.aspx

measure your cylinder and look good in this list, which piston you need . your old size is 85,94, than is your needed size 85,95 in cast!

if you replace a cast-piston by a forged piston you have to know, that forged pistons need more clearance, caused of the different material character. a long time ago i found out that cast pistons with the same mark on the top, are a little bit bigger than forged pistons.
     
forged                                            cast
    -                    =                             A
    A                    =                             B
    B                    =                             C
    C                    =                             D ...

feel free to contact wiseco for the right piston size and your problem with the rattling in the motor will be gone forever. than it will sound like a swiss rolex... :-) you heared motorads bike in the video,

the C -size cast piston, you found in your motor you can get at all kawasaki-dealers . the stock pistons and con rods, that kawasaki build in all kx-modells are made by prox in japan, but without the prox-logo in the inside.

lsampson:
I think what I need is a SLIGHT OEM oversized piston... I'm borrowing an inside micrometer today, so I should be able to get it measured up tonight.

All I can find is 0.50 mm over sizes in Wiseco for over-bored engines (like the link you included), and all I can find in OEM is 1 size, part number 13001A (13001A: PISTON-ENGINE,B) but NO C pistons... :? :?

 

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