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i just got a yfz 450 and it went though the compression test and it came back as 155 is that good or bad? how could i change it if its bad? or what should i do thank you:)

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d/l an owners manual and read up on the factory procedure. A leakdown test would give you a more accurate story about your internals. It will tell you weather its a piston ring or valves. 155 doesnt sound low to me but Im going by what passenger cars read. In a nutshell you would need to remove the cams and head and inspect valves. if ok then remove the cylinder and inspect the piston/rings.

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