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Message: [QUOTE="michaelaverett, post: 1108839, member: 72213"] Hey guys. Thanks in advance for any info. I've just completed alot of work on my KX 125 and I am at my wits end. :bang: I was going to put a new top end in the bike but when I took it apart the piston and ring looked OK. The exhasut valves also seemed to be working fine. So I cleaned off all of the carbon and put the bike back together. Now, I only register a 25 on compression. My question is this..... How many parts of the bike affect compression? Is it just the piston, ring, and exhaust valves or am I missing something. If there is nothing else involved with compression will a new top end give me compression? Thanks, Mike [/QUOTE]