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Need carb settings on both screws on Ryobi C430

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Start with both screws about 1 and a half turns out from fully screwed in. The high screw will set your fuel for wide open. Back it out until you hear the motor run almost wild then screw it back in about a half a turn. The low screw is a little trickier. When you can quickly go to full throttle from idle its about right.

Posted on Aug 02, 2009

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1 Answer

How do I adj carb on ryobi bp42 that is too lean


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How do i set the carb on a ryobi


I haven't heard of Ryobi using a carb different to most similar machines which use a small diaphragm-type carb which uses suction impulses from the 2-stroke engine crankcase to lift fuel from the fuel tank into the carb. There is generally one screw which is a throttle stop and two screws which are fuel volume screws; one with a greater influence at low speed and idle and one with greater influence at high speed. The low speed screw does have some influence at high speed and the high speed screw does have some influence over low speed fuel mixture.

The basic settings of the screws should not be lost and if stripping and cleaning the carb each screw should before removing be carefully turned in, counting the turns, until it bottoms so after cleaning it can be returned to its former position.

The amount of adjustment from the position the manufacturer set each screw to would typically be in the order of plus or minus one-eighth of a turn and if adjustment of more than about a quarter-turn is needed it could indicate the carb needs a thorough clean.

Making an adjustment of one screw means adjustment of the other is almost inevitable. The basic requirement is for the machine to work under load efficiently at high speed and it is usually desirable the machine will be capable of idling. Obtaining both is rather a balancing act and will need some patience and time making minor adjustments of each screw and in practice some compromises must be made and if hard work at speed has been achieved it usually doesn't pay to try too hard to achieve a smooth idle.

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I have the same problem. It would appear to be coming from the tube right outside the carb intake. I am not sure there is a solution for this. I am going to take mine back and swap it out. After tweaking the needles and getting it running perfectly, I really like it other than the goo sludging all over the tank.

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