Maintenance & Technical > KX500 Original
Need HELP seized
Danger4u2:
They should be plated. Nickel Silicon Carbide. Nikasil
http://www.mt-llc.com/
http://www.kawieriders.com/forum/kawasaki-kfx700-v-force/91562-nikasil-vs-sleeves.html
Polar-Bus:
IMS roll, ya got me all confused, you bought an initially good running bike, then immediately blew the top end, replaced it, then blew the top end a 2nd time, replaced it a 2nd time, and now you're on your 3rd rebuild ? How did the cyl look when you did the first top end ? Did your "buddy" mic the bore to see if it's in spec ? Did you at any time take compression readings ? If you feel gouges in the cyl bore with your fingernail, you need to weld and replate the bore (OEM nickasil). If you have a Wiseco/ sleeve combo those can be over bored. Seems top me like your simply blowing top ends, and slapping parts back together without carefully diagnosing to ROOT cause of the failures (which IMO is NOT your jetting) Yes you were a bit lean, but not lean enough to completely blow a top end...
Ims Roll:
--- Quote from: Polar-Bus on September 14, 2012, 10:47:39 PM ---IMS roll, ya got me all confused, you bought an initially good running bike, then immediately blew the top end, replaced it, then blew the top end a 2nd time, replaced it a 2nd time, and now you're on your 3rd rebuild ? How did the cyl look when you did the first top end ? Did your "buddy" mic the bore to see if it's in spec ? Did you at any time take compression readings ? If you feel gouges in the cyl bore with your fingernail, you need to weld and replate the bore (OEM nickasil). If you have a Wiseco/ sleeve combo those can be over bored. Seems top me like your simply blowing top ends, and slapping parts back together without carefully diagnosing to ROOT cause of the failures (which IMO is NOT your jetting) Yes you were a bit lean, but not lean enough to completely blow a top end...
--- End quote ---
i have only done one complete top end rebuild, the top end the first time just looked to be a little to lean and alot to hot. i just pulled the top end apart last night and it looks the same... spark plug is charcoal grey and the piston rings are melted to the piston and cyl walls scorred pretty bad. ill have opics up today
Motorrad:
The motor I got to rebuild for usmc500 died (the reason i got it, not the one i built) because the previous owner just slapped a forged piston (wiseco) in a cast piston bore (oem) ...
Needles to say .0015" piston to wall don't cut it for forged
What's your piston to wall clearance
Also you can't trust plug reading if you got it that hot
Ims Roll:
it was a cast piston in a oem bore just honned a little. i trusted the spark plug cause it was running amazing... maybe 2 good to be true huh... when it stopped i could hear water boiling but it sounded as if the rads were only half full but i bled the motor n rads several times an am 98% sure all the air was out of them. i did notice upon tear town yesterday that the air filter was ripped. could it have tore open even farther under powerband and leaned it out? or perhaps my fuel mixure was even toooooo rich? i mix 91oct with motul 800 at 32:1 an my kx250 loves it and it seemed as if the k5 did too.
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