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Message: [QUOTE="rmc_olderthandirt, post: 1388765, member: 68872"] The motor may be roughly the same but the carburetor could be different. While the number on the jet is a reference to its size there are several different ways that the jets are measured so without knowing a lot of technical details it is hard to compare a size 158 jet in one carburetor to a 170 on a different carburetor. In addition, the size of the jet will vary with the size of the venturi, which may vary with model year of the bike. Rod [/QUOTE]