8- 1- 2 PILOTSYSTEM
The pilot system feeds the fuel to theengine during idling and
The fuel is fed through the main jet to the pilot jet,where it is metered, and mixed with the air metered by the pilot air jet.
The
8- 1 - 3 MAIN SYSTEM
The main system feeds the fuel to theengine during medium- and
The fuel is metered by the main jet and fedto the main nozzle. The air metered by the main air jet is mixed with the fuel through the bleed holes in the main nozzle, and the mixture is atomized out of the main bore. It is mixed again with the air taken through the air cleaner into an optimum
8 - 1 - 4 CHOKE
The choke is used for easy start in the'cold season. When the recoil starter is pulled with a closed choke, the negative pressure applied to the main nozzle increases and draws much fuel accordingly; thus easily start up the engine.
8-2 DISASSEMBLY and REASSEMBLY
Apart from mechanical failusres, most of carburetor troubles are caused by an incorrect mixing ratio, which may arise mainly due t o a clogged up air or fuel passage in jets, or fuellevel variations. In order to assure pro- per flow of air and fuel, the carburetor must be kept clean at all times. The carburetor disassembly and re- assembly procedures are as follows: (See Fig.5 1.)
8-2- 1 THROTTLE SYSTEM
1)Remove the Philips screw (33) and throttle valve
(28), and pull out the throttle shaft(29).
2 ) The spring (30)can be takenoutby removing the throttle stopscrew (3 1).
*Exercise care not to damage throttlevalve ends.
8 - 2 - 2 CHOKE SYSTEM
1) Remove the Philipsscrew (22)andchoke valve (23), and pull out the choke shaft(24).
2) When reassembling thechokeshaft,make sure | 17 |
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that the cutoutin the chokevalve faces the main |
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air jet. |
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Meantime, when reassembling set the rings (26) |
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and (27) at the right position. |
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1) Remove the pilotjet (32), using correct tool to |
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avoid damage to it. |
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2) Reassembly |
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Tighten the pilotjet securely. Otherwise,the fuel |
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may leak, causing engine malfunction. | Fig. 51 |
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