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Discussion Starter · #1 ·
I am rebuilding the top end on my 2004 450 SX Racing since the cylinder wall is cracked. The wall itself and the sleeve are both compromised, resulting in coolant leakage into the cylinder.

I've been calling around parts suppliers looking for a replacement cylinder (part # 59430005000) but everyone says that KTM had discontinued the part. I've tried eBay but the selection they have on there is clapped out. I've also called my local machine shop and they said they could weld the cylinder wall and re-sleeve the cylinder, but that it would take them about 6 weeks.

Any pointers for where I can find the part? Should I just get the cylinder rebuilt by a machine shop?

Any suggestions help. Thanks!
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