John k Posted February 15, 2018 Report Share Posted February 15, 2018 I've just rebuilt my Solex B30 and upon refitting it ran but not great. The manual states to screw the Air mixture screw all the way in then back it off 1 1/2 or two flats. What is a flat? Is one flat a 180 degree turn as the slot in the head of the screw is for a flat blade screw driver or is it a whole revolution? Thanks. Link to comment Share on other sites More sharing options...
AidanT Posted February 15, 2018 Report Share Posted February 15, 2018 A flat is usually used in terms of a bolt head or nut and refers to just one side so for an eight sided bolt head it would be an eighth of 360 degrees ie 45 degree turn Sure others will confirm Aidan Link to comment Share on other sites More sharing options...
John k Posted February 15, 2018 Author Report Share Posted February 15, 2018 Thanks Aidan. Unfortunately the air screw has a circular circumference and not hexagonal but i'll try that. Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 15, 2018 Report Share Posted February 15, 2018 flats one side of the 6 sided nut head, if youres is a screw/.knurled thing then 1.5 turns is a good start point if counting flats it would equal 1 turn plus 3 flats, not your's though. the idle screw needs to open the throttle plate the same about 1.5 turns from being shut. the idle circuirt only works at idle and a very small opening of the throttle plate, if the idle screw is making a fast idle the adjustable mixture idle circuir is cut off and by passed if there is no obvious change with the idle screw slow the idle down, re adjust the mixture screw and again check the idle is not increaseing the small holes on the base top face are important they are clear right down to the small orifices near the throttle plate do check the idle jet, ( on the outside ) is clear and not got debris in the jet holder or the jet Pete Link to comment Share on other sites More sharing options...
John k Posted February 15, 2018 Author Report Share Posted February 15, 2018 Thanks Pete, I cleaned the carb in an ultrasonic cleaner after stripping it. I couldn't believe how much emulsified gunk was in the float chamber after it sitting for 18 months, the curse of ethanol in petrol I believe. I'll have another go this weekend. Link to comment Share on other sites More sharing options...
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