Generic Race 50, Service Manual

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11.4 Installation & adjustment
Assembly and installatioj is conducted in the reverse order of disassembly.
Adjustment of carburetor
Attention: When the carburettor is ready for sell, the idle adjusting bolts have already been adjusted, so they
generally require no adjustment. When dismantling the carburettor, the number of turning of the bolts should be
recorded which is very helpful during the installation.
Switch on and warm up the machine for about 3 minutes, so that the engine will operate in normal running
temperature;
Adjust the idle adjustment bolts and set engine speed to be
1800rpm；
Screw the mixture adjustment bolt to the end with proper force.
At this point the engine will stall
（
if not
，
inspect whether air escapes at the interface of air filter , whether the bolt is
tightened and whether the intake of the air filter is blocked);
Withdraw the mixture adjustment bolt for 1 circle;
Restart and adjust the idle adjustment screw so that the rotation speed reaches 2000-2500rpm;
Slowly adjust the mixture adjustment bolts
（
anticlockwise), till the engine speed reaches its utmost
（
mixture bolt
is withdrawn for two circles at most
）
.
Reset the idle adjustment screw and set the engine speed down to 1500±100rpm/min.
Pull the throttle for several times for acceleration and inspect whether the idle speed is steady.
Test the outlet and compare it with the specified standards.