Yamaha TRX850 Enthusiasts Forum

Here is a list of Tech specs I've compiled on the TRX carby set ups in std format as base settings..

FCR 41

Main jet ............ 150
Pilot fuel ........... 48
Jet Needle ........... OCEMP
Needle jet .............
Float needle....... 2.0
Float level ......... 9mm
Pilot screw ....... 1.5
Main air ............ 200
Air screw .......... 1
Intake spigot length 33mm / 26mm in place


( http://www.mikuni-topham.de/ENGLISHSITE ... glish.html )

TDMR 40 B-11

Main jet .......... 145 (180)
Pilot fuel ......... 25 (27.5)
Pilot screw....... 2.5
Jet Needle ........... 10EI1-50
Needle jet ...... P-6
Idle air .......... 120
Float level ...... 13mm

Std TRX850

Main jet ..........142.5
Pilot jet ........... 45
Pilot screw ...... 2.0
Jet Needle ....... 5E185-2/5
Needle jet ....... Y-2
Pilot air jet 1......... 70
Pilot air jet 2........ 1.4

Replacement kits from Keyster KY 0570 ( std TRX/tdm 850 )
http://www.motorcyclespareswarehouse.co ... -parts-kit

Here is a link to the air cut off valve replacements..
http://www.motorcyclespareswarehouse.co ... ve-88-y001
There's no picture but it's the white plastic piece on the side of the std carbies that slowly perishes and leaks air causing issues..
I'm sure someone can expand who has experienced this with the symptoms ..

Any extra info please feel free to expand this thread..

Here's the picture (from the German Forum)

Would anyone know where to get hold of standard carb parts? Have a crack that I've had to try and fix on the float cover where the bleed screw locates so would ideally like to replace in case my 'fix' fails.

gavtron wrote:Would anyone know where to get hold of standard carb parts? Have a crack that I've had to try and fix on the float cover where the bleed screw locates so would ideally like to replace in case my 'fix' fails.

Allen's: http://www.allensperformance.co.uk/ might be able to help.