Husqvarna 2009 TE 310 Workshop Manual page 339

"KIT" ASSEMBLING INSTRUCTIONS
4- KEIHIN 37 carburetor Kit (TXC 250) and KEIHIN 41 (TXC 450-510) - Remove the carburetor (page E.9).
The kit consists of:
TXC 250
1- Idle jet: 40, 45
3- Main jet: 170, 180
TXC 450-510
1- Idle jet: 42, 48
3- Main jet: 185
Remove the floater chamber (A). Replace the parts 1 and 3 with the KIT parts Reassemble the carburettor in the reverse order that was
shown for disassembling.
Part. N. 8000 H0368 (09-2008) O.7