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TECHTRONIC INDUSTRIES 

NORTH AMERICA, INC.

1428 Pearman Dairy Road

Anderson, SC 29625, USA

Phone 1-800-860-4050

www.ryobitools.com

A - Spark plug wire (fil de la bougie, cable de la bujía)

B - Primer bulb (poire d’amorçage, bomba de cebado)

C - Latches (loquets, pestillos)

D - Large fitting (ajustement pour une poire de grandes 

dimensions, conexión grande)

E - Small fitting (ajustement pour une poire de petites 

dimensions,  conexión pequeña)

F - Air box cover (couvercle de filtre à air, tapa de la caja de 

aire)

The following instructions apply only to PRIMER 
BULB (Large, figure 1 and Small, figure 2).

INSTALLING A NEW PRIMER BULB

See figures 1 - 2.

NOTE:

 Before removing the air box cover or replacing any parts, 

clean the area to remove dirt or debris that could enter the air 

box or carburetor.

Drain all fuel from fuel tank into a container approved for 

gasoline.

 

NOTE: 

Press primer bulb several times to purge fuel from 

carburetor.

Remove the air box cover if needed to gain access to screws.

 

NOTE:

 Refer to the Operator’s Manual for your product 

instructions on airbox cover removal.

Remove the screws and plate and set aside.

Carefully pull on the primer bulb to remove ONLY the primer 

bulb.

Install the new primer bulb onto the primer base.

Reinstall the plate and screws. Tighten the screws securely.

Reinstall the air box cover.

Check for leaks before running product.

Press primer bulb 10 times to be sure primer bulb is working 
properly. Bulb should fill at least half way with fuel.

The following instructions apply only to PRIMER 
BULB (Remote).

INSTALLING A NEW REMOTE PRIMER BULB

See figure 3.

Drain all fuel from fuel tank into a container approved for 

gasoline.

 

NOTE: 

Press primer bulb several times to purge fuel from 

carburetor.

Remove the air box cover (or cylinder cover) if needed to 

gain access to Primer bulb.

 

NOTE:

 Refer to the Operator’s Manual for your product  

instructions on air box cover removal.

Depress latches on both sides of the old primer bulb and 

remove it from base.

Disconnect the primer line and return fuel line from the old 

primer bulb.

 

 

NOTE: 

The primer line is the fuel line that connects the 

primer bulb to the carburetor.

Connect return line to the large fitting on the new primer bulb 

and attach primer line to the small fitting.

Install new primer bulb onto the base, ensuring that it latches 

securely in place, and reassemble.

Check for leaks before running product.

Press primer bulb 10 times to be sure primer bulb is working 
properly. Bulb should fill at least half way with fuel.

WARNING:

Check for fuel leaks after completing installation of primer 
bulb and/or fuel line. Any part that is leaking fuel is a fire 
hazard and must be replaced or reinstalled immediately. 
If you find any leaks, correct the problem before using the 
product. Failure to do so could result in a fire that could 
cause serious personal injury.

PRIMER BULB REPLACEMENT KIT
AC20100

WARNING:

To reduce the risk of injury, user must read and understand 
the operator’s manual for their string trimmer or powerhead 
and this instruction sheet. Always wear eye protection with 
side shields marked to comply with ANSI Z87.1. Ensure 
compatibility and fit before using this accessory. Do not use 
this accessory if a part is damaged or missing. If you are 
not comfortable performing any of the functions described 
in these instructions, take your unit to an authorized service 
center.

WARNING:

Before installing the new primer bulb and/or fuel lines, shut 
off engine, wait for all moving parts to stop, allow engine to 
cool, drain any remaining fuel from tank into approved fuel 
container, press the primer bulb several times to remove any 
remaining fuel, then disconnect spark plug wire and move 
it away from spark plug. Failure to follow these instructions 
can result in serious personal injury or property damage.

WARNING:

Gasoline and its vapors are highly flammable and explosive. 

To prevent serious personal injury and property damage, 

handle it with care. Keep away from ignition sources, open 

flames, and sparks, handle outdoors only, do not smoke and 

wipe up spills immediately.

PACKING LIST:

Primer bulb (Large) fits:

 

Homelite Blowers (incl Backpack): 26cc models

Homelite Cultivators: 26cc models

Homelite Hedge Trimmers: 26cc models

Homelite Trimmers (incl Mighty-Lite): 25cc and 26cc models

Ryobi Blowers: 26cc and 30cc Electric-Start Backpack 
models

Ryobi String Trimmers/Brushcutters/Tree Pruners: 26cc and 
30cc models [EXCEPT RY30020/40/60, RY52002/04]

Ryobi 4Cycle 30cc String Trimmer models RY34000/420/440

Ryobi 4Cycle 30cc Cultivator, Wheeled Edger, and Wheeled 
Trimmer models

Primer bulb (Remote) fits:

Homelite Blowers: 25cc and 30cc models

 

Homelite Chainsaws: 33cc, 45cc, and 46cc models

Ryobi Blowers (incl Backpack): 25.4cc models

Ryobi Chainsaws: 40cc and 46cc models

Ryobi Cultivators: 25.4cc models

Ryobi String Trimmer/Brushcutter/Tree Pruner models 
RY30020/40/60, RY52002/04

Ryobi 4Cycle 30cc Blower models

Toro 25.4cc String Trimmers/Brushcutters and Blower models

Primer bulb (Small) fits:

 

  Ryobi 4Cycle 30cc String Trimmer models RY34001/421/441

Fig. 2

Fig. 1

988000-448

5-20-11 (REV:03)

A - Air box cover (couvercle de filtre à air,  

tapa de la caja de aire)

B - Primer base  (base de l’amorceur, base del cebador)

C - Spark plug wire (fil de la bougie, cable de la bujía)

D - Primer bulb (poire d’amorçage, bomba de cebado)

E - Plate (plaque, placa)

F - Screws (vis, tornillos)

A - Screw  (vis, tornillo)

B - Primer bulb plate (plaque de poire d’amorçage,  

placa de bomba de cebado)

C - Primer bulb  (poire d’amorçage, bomba de cebado)

D - Primer base  (base de l’amorceur, base del cebador)

E - Spark plug wire (fil de la bougie, cable de la bujía)

F - Air box cover (couvercle de filtre à air,  

tapa de la caja de aire)

A

F

A

E

B

D

C

Fig. 3

C

B

A

F

B

B

C

B

D

C

D

E

E

WARNING: 

This product contains chemicals, including lead, 

known to the State of California to cause can-

cer, birth defects and other reproductive harm. 

Wash hands after handling.

F

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