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      JUST IN!   07/18/2018

      Video: 2019 Yamaha YZ250F Features & Benefits 


jamesm113

Carb Mods

The recommended baseline jetting seems to a #38 pilot and a #130 main.  The TTR230's come with a TK (Teikei) carb stock and jets are somewhat difficult to find.  Stock jetting is a #36 pilot, a #125 main and a 5C20 needle.

Pilot Jets - Yamaha Part Numbers
#36 - 1C6-14342-18-00 (stock)
#36 - 43F-14342-18-00 (obsolete)
#38 - 43F-14342-19-00
#38 - 43F-14342-68-00 (obsolete)

Main Jet Size - Yamaha Part Numbers - TK Part No
#122 - 288-14343-61-00
#125 - 288-14343-63-00 (stock)
#130 - 288-14343-65-00
#135 - 288-14343-68-00
#140 - 288-14343-70-00
#146 - 288-14343-73-00
#156 - 288-14343-78-00
#160 - 288-14343-80-00

Links:
JetsRUs Teikei Main Jets: http://jetsrus.com/a_jets_by_carburetor_type/jets_teikei_main_hex_3T.html
JetsRUs Teikei Pilot Jets: http://jetsrus.com/a_jets_by_carburetor_type/jets_teikei_slow_3U.html
Yamaha Parts: http://www.partzilla.com/parts/search/Yamaha/Motorcycle/1985/TRIALS+-+TY350N/CARBURETOR/parts.html

 




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