belldane Posted August 20, 2009 Report Share Posted August 20, 2009 Would anyone happen to know the standard jet sizes and needle position for a TY250a, please? The bike has the standard TK carb on it. Thanks Quote Link to comment Share on other sites More sharing options...
feetupfun Posted August 21, 2009 Report Share Posted August 21, 2009 I'll have a look this afternoon and post them up but you should be aware that the jetting numbers for that TK carby do not necessarily relate to Mikuni numbers. Quote Link to comment Share on other sites More sharing options...
feetupfun Posted August 21, 2009 Report Share Posted August 21, 2009 This is from the Yamaha TY250A parts book: Pilot jet #50 Main jet #114 Slide cutaway #3.0 Slide needle 5C92-4 Needle jet is called "nozzle-main" Yamaha part number 434-14341-00 This is from a tune-up book: TY250A 434-000101 onwards Carby model Teikei Y26P Float level 21mm Starter jet No 90 Air jet 2.5 Air screw 2.5 turns Pilot jet No 50 Main jet No 112 Jet needle/clip position 5C9Z-3 Cut-away No 3.0 Needle jet S-85 Quote Link to comment Share on other sites More sharing options...
belldane Posted August 21, 2009 Author Report Share Posted August 21, 2009 Thank you very much for that mate. Quote Link to comment Share on other sites More sharing options...
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