Ryobi is a well-known manufacturer of outdoor lawn maintenance equipment, including string trimmers and brushcutters like the BC30. If your BC30 brushcutter has begun performing poorly, you will need to determine the source of the problem and correct it.
Remove the spark plug wire and boot from the spark plug.
Remove the spark plug by turning it counter-clockwise until it is free. Examine the firing point. If it is fouled with engine deposits, clean them way with the brass bristle brush.
Replace the spark plug and reattach the boot. Try to start the engine. If it starts, you've identified the problem. If not, your spark plug may require replacement. The BC30 is factory equipped with either a Champion RCJ-6Y or NGK BPMR-7A spark plug. Acquire an identical new plug and install it.
Check the primer bulb for fuel. If it is empty, press it seven times to fill it and properly prime the engine. Turn the choke dial cover into the "Full Choke" position and attempt to start the unit. If the primer bulb refuses to fill, the fuel system is blocked and will require repair by a Ryobi authorised service dealer.
Smell the air close to the engine. If there is a strong gasoline odour present, the engine may be flooded. Set the Start Lever into the "Start" position and pull on the starter rope repeatedly until the engine begins to fire.
Recall the last time you mixed fuel for your brushcutter. If it has been more than 30 days, Ryobi suggests replacing the old fuel with fresh. Ethanol-gasoline blends begin to deteriorate after 30 days, so to avoid this, Ryobi recommends mixing only small batches of fuel at any one time. Dispose of the old fuel in accordance will all local environmental regulations. Mix your new fuel with a gasoline to 2-cycle oil ratio of 50:1. Ryobi recommends using Ryobi brand two-cycle oil (Ryobi part number 147543), which is specifically formulated for its engines.
Remove the hex nut, wavy washer, flat washer and choke dial cover. These components will be found on the left side of the engine. The air filter screen is located directly behind the cover.
Brush the air filter screen with your shop brush or old toothbrush. Brush it gently to remove any dust or dirt which may be clogging it.
Reinstall the choke dial cover, washers and hex nut. Attempt to start the unit.
Start the brushcutter and warm the engine. If the engine will accelerate but stalls when idling, the idle speed is too low. If the engine will not decelerate when the throttle trigger is eased, the idle speed is set too high.
Shut off the unit.
Locate the carburettor adjustment port. It will be found on the outer housing of the carburettor which is located behind the choke dial cover. The port is a small round hole located between the "Half Choke" and "Run" labels.
Insert the screwdriver into the hole. To lower the idle speed, turn the screw 1/4 turn counter-clockwise. To increase the idle speed, turn the screw 1/4 turn clockwise. Restart the trimmer and check the idle speed again. If further adjustment is required, repeat the process in 1/4 turn increments until the idle speed is satisfactory.
Start the brushcutter and begin cutting a small section of brush. If the blade tears the brush away in jagged pieces, it has dulled and will no longer cut cleanly.
Shut off the unit.
Remove the blade nut and cupped washer holding the Tri-Arc blade in place.
Flip the blade over and reinstall it along with the washer and blade nut. This technique will extend the blade life. If the blade still cuts poorly, replace it with a new Tri-Arc blade (part number AP04105).
You BC30 has been specifically engineered to use only the Tri-Arc cutting blade. Do not attempt to substitute another brand. You could damage the unit or void the warranty.