Steps for installation:
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1、 After confirm inner hole of idle speed jet and horizontal hole are smooth, screw idle speed jet;
2、 Install main jet in main nozzle hole (the end of smaller diameter against main nozzle hole);
3、 After confirm the horizontal hole of foam tube is smooth, screw foam tube;
4、 Screw main jet hole;
5、 Assemble needle valve with floater into needle seat, needle valve pothook is hang on floater tongue;
6、 Assemble floater pin in floater pin seat, floater pin threads into floater pin seat and floater in order;
7、 Inspect if height of floater is 15±1mm,adjust floater tongure if it is not;
8、 Assemble under shell correctly;
9、 Respectively assemble idle speed adjusting screw, spring, mixture ratio adjusting screw and spring, gasket, seal ring
correctly (reverse mixture ratio 1-2 round after it has been assembled correctly);
10、install electric condensing valve assy. and blocking wind valve assy. in order;
11、install oil needle, spring, oil needle compaction cap in order;
12、install stopper assy., Stopper spring, upper cover correctly and inspect if stop moves freely.
Steps for adjusting carburetor:
Install carburetor in engine, and then adjust it as the following steps:
1、 Start and warmup engine for about three seconds so that engine rotates at normal driving temperature;
2、 Adjust idle speed adjusting screw so that engine rotates at 1600rpm;
3、 Screw mixture ratio adjusting screw into bottom, the strength is not too weight;
4、 Now engine shuts off (if it doesnot shut off, inspect if gas leaks out of the joint of air cleaner and if screw is
tight, inspect if the inlet port of air cleaner is blocked);
5、 Screw mixture ratio adjusting screw back for one round;
6、 Restart ingine, adjust idle speed adjusting screw to be 2000-2500rpm;
7、 Slowly adjust mixture ratio screw(anticlockwise)until engine rotates at the highest speed(screw mixture
ratio screw back for less than or equal to 2 rounds);
8、 Readjust idle speed adjuting screw so that engine rotates at 1600±100rpm;
9、 Play up throttle to accelerate rotating, inspect if its rotating speed is stable;
10、measure exhaust and compare it to standard volume.
Notice:
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1、 Adjust mixture ratio screw properly not too tight, never energize too much, otherwise it may damage
mixture ratio screw head enve break the adjusting screw;
2、 If engine is adjusted to be too slow rotating speed, engine may be off, in reverse, engine may may consume
too much fuel.
WARNING:
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After engine rotates normally at idle speed for some time, turn throttle completely, then loose throttle
handlebar completely, at this time if idle speed changes, it means that throttle calbe has not been adjusted well.
So before measner engine, pay spedial attention to corresponding adjustment.