I believe from the needle numbers that this is originally from a Honda NS250 race bike 1998 ,Keihin PJ31 40mm with needle stamped R1268N over 1157D , Main jet is 188 , pilot is 48 and slide is stamped 50 In good solid condition with all threads and fitting points intact , nothing is seized or broken , choke working properly and air screw turning freely As you can see from the pics there is light corrosion in the float chamber so will need a vapour blast in this area Feel free to message me for any more information SL = S3
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