Honda CB125 CB160 (1972) [56/139] Refer to fig 3 144

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50 3 ENGINE C Adjustment 1 Adjustment at high speed In the range from full throttle to 1 2 throttle ad justment of the mixture ratio is made by the main jet Refer to Fig 3 144 Determination of mixture density is obtained by the following methods a At fuel throttle if the speed is reduced by slightly closing the choke the mixed gas is too thin In such case the main jet should be replaced with a Fig 3 144 Replacing of main jet larger one and a condition check made b If speed is reduced by closing the choke the main jet is suitable or is too large Determination is made by the following methods Ill When the main jet is suitable When a smaller main jet is employed and speed decreases and when the choke is slightly closed and speed in creases the new main jet smaller one is too small Hence the original one is suitable 2 When the main jet is too large Gradually smaller main jets should be employed in replace ment until the status described in section 11 results Fig 3 145 Changing step of Jet needle 2 Adjustment at mid throttle Adjustment of the mixture in a range from 1 8 to 1 2 throttle is mainly obtained by the jet needle steps and the cutaway of the throttle valve However as the cutway of the throttle valve influences the range below 1 8 throttle misadjustment is apt to occur For medium speed adjustment as long as accelera tion characteristics are maintained employment of a smaller jet needle is more practical Refer to Fig 3 145 a Jet needle 1 If abnormal black smoke is ejected during operation at medium speed the mixture is too heavy the jet needle should be pulled up one step 2 During engine braking after accelerating or cruising when the engine sounds rough the jet needle clip should be lowered by one step b Cutaway of throttle valve When the throttle cutaway with a larger number is employed the mixture becomes thinner and vice versa The throttle vavle covers not only medium speed but also low speed in the range of adjust ment taken while adjusting 1 Except for special cases such as racing rep lacement of the cutaway is not required

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