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Dirt Bike Brands - Other
KX 125 92 Overbore Kit (139-144cc)
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[QUOTE="Imack, post: 1199450, member: 69296"] Zachs: I do not remember from the top of my head, all KX 125 1992 and newer have a 54 bore x 54.5 stroke. 1991 and few years back 56 mm bore. I have used 1991 pistons from KX125 to make a 140 cc from a KX 125 2003. I am almost sure that 91 was the last year to have a 56 mm piston. 56.5 will give you 140 cc. Wiseco sells the 56 .020 oversize. Certain minor modifications to the piston are required. In general terms, all you do is find the right diameter piston with certain right dimensions such as the distance from the crankpin to the crown. The rest could be machined to mach the engine features. It is very difficult to make good pistons, but not impossible and someguys may have their own foundry and cast tools, do not know any of them, I just buy the nearest piston to my application. You can see that in the piston application catalog at wiseco.com. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
KX 125 92 Overbore Kit (139-144cc)
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