GAS GAS EC250 2012, Owner'S Manual

Page: 63 / 81

Owner’s manual
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MAIN JET
Has a greater e ff ect from 75% to 100% load. The number stamped on the
bo tt om of the jet (1) indicates the fl ow of fuel passing through the hole. A higher
number corresponds to a larger hole, more fuel passes.
NOTE: Never use “jet gauge sets” that are in the market. Its use is incorrect.
Always use new jets without manipula ti ng (sealed in their bags).
DANGER
Gasoline is extremely fl ammable and can be explosive under certain condi ti ons.
When you handle the carburetor, stop the engine and do not smoke. Make sure
the area is well ven ti lated and free from any source of sparks or fl ames (this inclu-
des any appliance with a pilot light).
1
Carburetor setting
NEEDLE
The needle and the main jet together have an e ff ect ranging from 25% to 75%
load. The needle moves into the main jet, when the needle narrows, changes from
cylindrical (1) to conical (2), its posi ti on determines the amount of fuel passing.
At the top of the needle are fi ve slots (3) which sets the clip. This clip posi ti ons
the needle on the thro tt le valve and determines the rela ti ve posi ti on of the main
jet (that’s why the mix is enriched). Moving the clip up leans the mixture. Change
te clip posi ti on on step at a ti me (the cylindrical part of the needle a ff ects the res-
ponse to small thro tt le valve openings).
The posi ti on of the clip is set coun ti ng from the top posi ti on.
3
2
1
Fuel Unleaded (RON 95)
Main jet 175
Idle jet 42
Needle N1EF
Needle posi ti on 3rd from top
Thro tt le valve 7
Mixture screw 1 turn from fully closed
REFERENCE CARBURETION (COMPETITION USE ONLY)