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Ryobi RY08420A Backpack Blower

Ryobi RY08420A Backpack Blower Parts

Page A
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Page A
 Fig #
1
Frame
 $16.58

Part Number: 524584001

In Stock, 7 Available

Ships within 1 business day
 $16.58
2
Fuel Tank Assembly
 $15.79

Part Number: 310752015

In Stock, 7 Available

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 $15.79
3
Fuel Cap Assembly
 $4.55

Part Number: 310816005

In Stock, 9 Available

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 $4.55
4
Cable Clamp
 $1.99

Part Number: 678561001

In Stock, 1 Available

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 $1.99
5
Wrench L-25
 $1.31

Part Number: 631055012

In Stock, 2 Available

Ships within 1 business day
 $1.31
6
Screw (10-14 x 16 mm)
 $1.99

Part Number: 660614001

In Stock, 4 Available

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 $1.99
A-7
Spring
 $1.99

Part Number: 679950001

In Stock, 6 Available

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 $1.99
8
Screw (10-14 x 16 mm)
 $1.99

Part Number: 660626006

In Stock, 5 Available

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 $1.99
9
Strap
 $32.06

Part Number: 901588003

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10
Harness Snap Fastener
 $1.99

Part Number: 525644002

In Stock, 9 Available

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 $1.99
11
Ignition Module Assembly
 $19.03

Part Number: 291424001

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 $19.03
12
Throttle Cable
 $12.87

Part Number: 290298003

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 $12.87
13
Clamp Set
 $2.31

Part Number: 580465001

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 $2.31
14
Tube
 $9.98

Part Number: 580693004

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 $9.98
15
Clamp Set
 $2.31

Part Number: 580465001

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 $2.31
16
Bushing
 $2.99

Part Number: 518481003

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 $2.99
17
Left Hand Handle
 $3.90

Part Number: 518271004

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 $3.90
18
Blow Mould, Upper Tube, Black
 $5.03

Part Number: 580692003

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 $5.03
19
Cruise Lever
 $1.99

Part Number: 518160007

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 $1.99
20
Washer
 $1.99

Part Number: 678125001

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 $1.99
21
Screw (#8-14 X 50 mm)
 $1.99

Part Number: 660666001

In Stock, 1 Available

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 $1.99
22
Trigger
 $1.99

Part Number: 518255005

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 $1.99
23
Momentary Contact Switch
 $3.99

Part Number: 760338004

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 $3.99
24
Trigger Lock
 $3.99

Part Number: 518150001

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25
Screw-Thread Form. (#10 X 3/4
 $1.99

Part Number: 82563

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 $1.99
26
Screw (M4 X 1.75 X 16 Pan Hd.)
 $2.99

Part Number: 660734001

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 $2.99
27
Knob
 $1.99

Part Number: 518273002

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 $1.99
28
Blower Tube
 $7.97

Part Number: 306947001

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 $7.97
29
Blower Tube
 $7.97

Part Number: 306947001

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 $7.97
30
Model Label
 $1.33

Part Number: 940991051

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 $1.33
31
Choke Label
 $1.99

Part Number: 941738001

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 $1.99
32
Start Instructions Label
 $1.99

Part Number: 941739001

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 $1.99
33
Logo Label
 $1.19

Part Number: 941740001

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 $1.19
34
Warning Label
 $1.99

Part Number: 941727003

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 $1.99
35
Combustion Warning Label
 $1.99

Part Number: 941727002

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 $1.99
36
Right Hand Handle
 $2.84

Part Number: 518272004

Ships In 6 - 11 Business Days

Ships in 6 - 11 business days
 $2.84
Page B
 Fig #
1
Screw 10-24 X 3/4 In
 $1.99

Part Number: 660629005

In Stock, 19 Available

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 $1.99
2
Engine Cover and Starter Assembly
 $39.02

Part Number: 308563013

In Stock, 9 Available

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 $39.02
3
Motor Cover
 $21.95

Part Number: 524587002

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 $21.95
4
Starter Grip
 $1.99

Part Number: 511731004

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 $1.99
5
Eyelet
 $1.19

Part Number: 638088002

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 $1.19
6
Spring and Container
 $4.28

Part Number: 638033001

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 $4.28
7
Starter Rope
 $3.99

Part Number: 900849002

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 $3.99
8
Starter Pulley
 $3.99

Part Number: 521519001

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9
Starter Cap
 $1.99

Part Number: 638980001

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 $1.99
10
Power Head
 $90.06

Part Number: 311017001

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 $90.06
11
Fan Disk
 $7.56

Part Number: 679052003

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 $7.56
12
Lock Nut
 
No Longer Available [ More Info ]

Part Number: 04277

Discontinued

Not Available

13
Bolt (M5 x 25.4 mm)
 $1.99

Part Number: 660613001

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 $1.99
14
Screw (M6 x 14 mm)
 
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Part Number: 661431003

Discontinued

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15
Spring Washer (ID64 x 16t)
 
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Part Number: 693001001

Discontinued

Not Available

16
Washer (OD129 x ID66 x 12t)
 
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Part Number: 693002001

Discontinued

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17
Engine Mount
 $15.29

Part Number: 634062001

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 $15.29
18
Screw (M5 x 08 in, 20 Torx)
 $1.99

Part Number: 660344007

Ships In 6 - 11 Business Days

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 $1.99
19
Tube
 $1.99

Part Number: 570373029

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 $1.99
20
Inner Volute
 $18.86

Part Number: 523921001

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 $18.86
21
Fan
 $7.90

Part Number: 518265004

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 $7.90
22
Outer Volute
 $13.09

Part Number: 524586001

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 $13.09
23
Outer Volute Cover
 $1.99

Part Number: 523926003

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 $1.99
24
Screw (10-14 x 16 mm)
 $1.99

Part Number: 660626006

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 $1.99
25
Eyelet
 $2.99

Part Number: 638088004

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 $2.99
26
Eyelet Support
 $1.99

Part Number: 522600003

Ships In 6 - 11 Business Days

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 $1.99
Page C
 Fig #
A-7
Spring
 $1.99

Part Number: 679950001

In Stock, 6 Available

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 $1.99
1
Screw (M5, Special)
 $1.99

Part Number: 660510009

In Stock, 2 Available

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 $1.99
2
Air Purge Bulb
 $4.05

Part Number: 300780002

In Stock, 25+ Available

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 $4.05
3
Spring Washer
 $1.07

Part Number: 678343002

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 $1.07
4
Gasket
 $3.99

Part Number: 562927001

In Stock, 14 Available

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 $3.99
5
Screw (M5 X 50 mm)
 $3.99

Part Number: 660347001

Ships In 6 - 11 Business Days

Ships in 6 - 11 business days
 $3.99
6
Screw (M5 x 08 in)
 $1.99

Part Number: 661832001

Ships In 6 - 11 Business Days

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 $1.99
7
Air Box Cover
 $8.36

Part Number: 533688001

In Stock, 12 Available

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 $8.36
8
Washer (#12)
 $1.99

Part Number: 671080001

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 $1.99
9
Carburetor
 $69.88

Part Number: 308054093

In Stock, 22 Available

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 $69.88
10
Air Box Cover
 $8.36

Part Number: 533688001

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 $8.36
11
Air Filter Box
 $3.99

Part Number: 900777004

In Stock, 15 Available

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 $3.99
12
Air Filter
 $5.15

Part Number: 900777005

In Stock, 25+ Available

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 $5.15
13
Screw (1/4-20 x 5/8 in.)
 $2.99

Part Number: 660612001

In Stock, 6 Available

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 $2.99
14
Gasket
 $3.99

Part Number: 901653007

In Stock, 5 Available

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 $3.99
15
Exhaust Assembly
 $47.91

Part Number: 309330004

In Stock, 4 Available

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 $47.91
16
Flywheel Nut
 $3.99

Part Number: 678067001

In Stock, 2 Available

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 $3.99
17
Washer, Flat 11/32 in.
 
No Longer Available [ More Info ]

Part Number: 631049001

Discontinued

Not Available

18
Flywheel Assembly
 $17.26

Part Number: 309013003

In Stock, 2 Available

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 $17.26
19
Short Block Assembly
 $70.54

Part Number: 309842001

In Stock, 21 Available

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 $70.54
20
Spark Plug
 $7.99

Part Number: 870170001

In Stock, 4 Available

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 $7.99
21
Gasket
 $3.99

Part Number: 562927003

In Stock, 8 Available

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 $3.99
22
Heat Dam
 $6.08

Part Number: 524583003

In Stock, 9 Available

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 $6.08
23
Spacer
 $1.99

Part Number: 638091011

In Stock, 3 Available

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 $1.99
24
Screw (M4)
 $1.99

Part Number: 983645005

In Stock, 1 Available

Ships within 1 business day
 $1.99
25
Washer (Heat Dam)
 $1.99

Part Number: 638980003

Ships In 6 - 11 Business Days

Ships in 6 - 11 business days
 $1.99
26
Choke Lever
 
No Longer Available [ More Info ]

Part Number: 524556007

Not Available
Miscellaneous Parts
A-800
Operators Manual (961469001)
 
No Longer Available [ More Info ]

Part Number: 990000036

Not Available
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Accessories
Accessories for the Ryobi RY08420A

Questions & Answers

Does the fuel tank come with hoses & filter?
James Garofolo for model number RY08420A
Hello James thanks for writing. It comes with the fuel lines but no hoses or filters. Hope this helps
There are two Fuel Lines on this model but there is a short one also. It goes from the bubble pump to were? You pump it and it will Squeele, block it and it sucks in your finger tip blocking it.
Bill for model number RY08420A
Hello Bill and thanks for writing. It goes from the tank to the bubble pump and then from the bubble pump to the engine Hope this help. Please contact us anytime. We do carry other spare parts for your unit such as Part # 870170001 spark plug .Good Luck with your repair
How come it runs for 10min and cuts of? What wrong?
Darrell McCormick for model number Bp42
Hello Darrell, thank you for inquiring. This may be due to either a clogged or dirty Air Filter, part number 900777005, or bad Spark Plug, part number 870170001 for your blower. Good luck with your repair!
how many gaskets are on this model from the heat dam to the air box? Also on the primer bulb what is the right connection for the fuel lines(bulb has a long and a short part)?
Richard for model number RY0842A
Hello Richard and thanks for writing. You have contacted ereplacementparts.com, we are not the manufacturer. We are a distributor for the multiple brands that we offer parts for. You may wish to contact your manufacturer directly for further assistance. We do carry other spare parts for units such as yours, for example, Part Number: 900777005 Good Luck with your repair.Ryobi 800-525-2579
I have a 42cc ryobi blower which suddenly started ro faulter. I took out the air filter and went to get a rag to clean it. when i got back the filter had gone and my dog was coughing and sneezing. Since there were piles of leaves all around I can not find it. I looked an your parts list to order a new part. The filter you show for this model is totally different. It was dark blue in color and about the size of a small match box. Is there an option?
Wilson
Good Day WIlson. Thank you for your question in regards to your unit. Based on our research the compatible air filter for model number RY08420A is Part Number 900777005. You can order this part either online at our website www.eReplacementParts.com or by calling us by phone at 866-322-9842. Best Regards.
What is the gap on spark plug supposed to b?
Robert for model number Ry08570
Hello Robert and thanks for writing. spark plug is about .025 in. electrode gap. We hope this helps. Please contact us anytime.
Is a tool available to adjust the carburetor needle valves?
Mike for model number Backpack leaf blower
Hello Mike and thanks for writing. You should not need any special tool, just a screwdriver. Locate the idle mixture screw and turn it clockwise until the needle lightly touches the seat. Then, turn the screw counterclockwise 1-1/2 turns. If your carburetor has a main jet adjustment screw at the base of the float bowl, turn the screw clockwise until you feel it just touch the seat inside the emulsion tube. We hope this helps. Please contact us anytime.
Ok I have a blower. I changed out the carb, fuel lines, fuel filter, spark plug, air cleaner,and gas cap (all new). Now trying to run it will prime and start up but will die as soon as I try to rev it up?almost as if it runs out of fuel.
Robert for model number ryobi back pack blower
Hello Robert and thanks for writing. It sounds exactly like it get no fuel, Did you empty out all the old fuel and started with a new batch, to make sure there is no debris in there? Empty the tank as residue might have settled in it ? We hope this helps. Please contact us anytime. We do carry other spare parts for units such as yours, for example, Part Number: 870174001. Good Luck with your repair.
Have ryobi backpack blower BP42 model RY08420A when put the choke in start position and start and start comes on then put in run position dies but if I put in between run and start where it won't stay if I let go of the button how do I fix it
James for model number RY08420A
Good Day James. Thank you for your question in regards to your unit (Model Number RY08420A). Based on our research you may need to replace one or more of the following parts: 1) Air Filter (Part Number 9007770052). 2) Carburetor (Part Number 308054093). 3) Gasket (Part Number 562927001). 4) Air Purge Bulb (Part Number 300780002). 5) Spark Plug (Part Number 870170001). You can order these part either online at our website www.eReplacementParts.com or by calling us by phone at 866-322-9842. Best Regards.
Discussion
Discussion for the Ryobi RY08420A Backpack Blower

Discussion is closed. To ask our experts a question about a part, use the Q&A feature on our product pages.
Question: Throttle Cable

ryobihead31

replaced carbureuter what hole on carbureuter to a put throttle cable tip in
Hello ryobihead31 Try inserting it in the hole that provides the best action and quickest response from the throttle trigger. There should be very little slack in the cable once it is attached to the carburetor. Some slack is OK. Too much slack in the cable and it will not be able to achieve Wide Open Throttle.
Question: Flooding?

jsnowash

Can't get our backpack blower started. The engine previously seized. I was able to free it up. The engine cranks, but won't start. I've got spark, it seems like the engine might be flooding. Not sure what to try next to try & get it going!
Hi jsnowash If the unit has some age on it, it may be time to pull the carburetor and install either 1. Gasket and Diaphragm Kit...or 2. Complete Carburetor Rebuild Kit. Either one restores the ability of the carburetor to work properly IF there there are no other internal failures; the most aggravating of which being a stuck check valve in the carburetor main nozzle.
If the engine is flooding, pull the spark plug, clean the spark plug...leave it OUT of the engine and let it engine dry out inside. On some Ryobis there is a lower crankcase cover that can be removed in the back...helping to dry the crankcase out even more.
Question: No Spark

Salazar

Hello i dont have no spark on my blower i change the Ignition Module Assembly and still no spark i dont know what is wrong with it
Yes i did i put a credit card in the middle of coil and the flywheel
I got spark now thank you but it still doesnt start i get gas 2 the spark plug and i have spark but it doesnt start.
Salazar A number of things could be causing the no -start. Try starting it by removing the plug and spraying carb/choke cleaner into the cylinder. That will tell us if the engine and timing are ok.....if it runs a few seconds.
Question: Carburetor Adjustment

1557529

Question to shotout - Thanks for the info in your reply to hard starting. How can I adjust the carb (no tamper screws)?
Hello Since i suppose you don't have the special tool; use a 22 gauge automotive type wire connector. I find that a female spade wire terminal connector. works great. Just tap the open end onto the mixture screw head until it is tight, and then you can turn by hand or insert flat blade screwdriver into the female spade end. Here are INSTRUCTIONS on how to properly adjust the carburetor.

link removed
Hi i dont have any spark on my blower i change the Ignition Module Assembly and still no spark i dont now what is wrong.
Hi Salazar Did you set the "air-gap" between the coil leg and the flywheel to about .010"? If the coil IS good and the gap is correct AND the flywheel magnets are not real weak, you should get spark.
Yes i did i put a credit card in the middle of coil and the flywheel
How can check the flywheel.
How can i check the flywheel if it works or not
Hi Salazar To test strength of flywheel magnets, hold a smaller flat blade screwdriver about an inch from each magnet. The magnet should PULL the blade into it. If it does not, it is weak, and may fail to excite the windings in the magneto.
The flywheel the magnets they have strength but it still have no spark
Salazar, How old is your machine and what is the make and model? THE ON/Off switch wiring or the switch itself may be the problem.
The model is RY08420A year is 2015
Salazar, OK then, it should be close to like new. Check the wiring from the coil to the on/off switch. When you disassembled and reassembled , something could have messed up. Do you know how to check the switch with a multitester? Also! spray some carb cleaner into the engine and try and start it!
Ok i will try that thanks
I put carb cleaner and it did not start
Salazar, How are you checking for spark? It appears from the diagram that the end of the wiring harness to the ignition module plugs into this momentary ON./OFF switch. This is a typical plastic rocker switch. Another thing. The ignition module has to be grounded to work properly. The mounting surface for it may provide the ground in this case. Check that the wiring harness from your ignition coil is properly mounted on the switch. Here is the switch.

http://www.ereplacementparts.com/momentary-contact-switch-p-565486.html

Here is the ignition module:

http://www.ereplacementparts.com/ignition-module-assembly-p-1742485.html

Make sure you are using a KNOWN GOOD spark plug when you test for spark.
Do the air gap over using a paper business card, not a credit card. Credit card may be too thick.
I got a tool 2 check 4 spark and i change the ignition module already before i was not getting spark and now i am is because i use a credit card before and now i use a business card and the spark plug is a champion
I got a tool 2 check 4 spark and i change the ignition module already before i was not getting spark and now i am is because i use a credit card before and now i use a business card and the spark plug is a champion
The blower tries 2 start but ot doesnt start
Salazar, I understand. Is the spark plug getting wet with gas when trying to start? WHAT ratio do you mix your 2 stroke fuel? How many ounces of oil per gallon of gas? What kind of oil have you been using? Have you run the blower a lot? I ask these things to give me an idea what condition the motor may be in!
Since your blower burns oil, it forms carbon in the engine and muffler. Too much oil causes too much carbon. That can clog the muffler or cause a piston ring to stick. That results in compression loss and engine will not start.
Question: Hard Starting

1552393

so I have replaced everypart except for the block and the wheel assembly. I still have a hard starting problem. like no starting. but it does fire. I Aam getting gas into the plug.the design on the carb. is terrible. the guy who designed it should of been fired.i can see by reading all about this model everyone has problems and they all say its junk.but link removed you tell me what the gap should be for the ignition and flywheel should be. could poor magnetics cause for poor spark? would Ryobi ever redesign something like this?thanks for your help. just frustrated.
Hello Your frustration is understood. I know working on these is a blast! Have spent a whole lot of time on them myself. Personally, the Poulan (they make the engine) machines ARE good when they run good, but a pain when they don't. Their performance is not bad, it is keeping UP that performance that is our challenge. The air gap between your coil legs and the magnets should be about .010" or the thickness of a business card. Use one as a tool to do it.
Magnets are funny. They do weaken over time. They can cause no starts if they become too weak. I am dealing with one doing just that currently on an Echo. They can weaken to the point where they no longer excite the windings in the coil. Some flywheels get their cast in aluminum timing key worn out by the steel crankshaft. Then the flywheel starts slipping. If it slips enough, a no start can also result. Ask me how I know! They can call them junk. A lot of Poulan (they make engines for Ryobi, Homelite, Craftsman, Toro, Troy Bilt etc.) engines can deliver great performance. It is the other parts that usually cause the problems. Need anything else, come back for more.
As far as redesigning, a redesign most likely would result in a higher price and buyers would look elsewhere...like to Echo and Husqvarna. The future may hold oil injection for the 2 stroke engines as some other machines already have it. It is not NEW technology, but it has not made it to the lower priced lawn equipment realm yet.
The carburetors are made in China for the most part. The problem with them now is HOW LEAN the US buyers make them set them. They have to pass EPA C.A.R.B. Tier III emissions standards. They do not want the general public to mess with them and change the settings, hence the tamper proof mixture screws. There are ways to get around this however and you learn after fooling with them for a while.
thank you so much for the info.One more question please? Are there points under the flywheel? As you can tell I'm not familiar with this type of motor.this was bought a year ago and ran about a dozen times. got hard to start and ive been replacing everything. So I just ordered the flywheel and a kill switch although I bypassed the kill switch and it didn't help. spare parts if I ever get it going. thanks again.
Hi alienmic No, they quit utilizing points and condensor on these many years ago. They went from points to CDI (capacitor disharge ignition) to solid state transistorized ignition. That is what most all of the machines like yours have now.
If you have a GOOD carburetor and a GOOD flywheel, you should be able to solve the no start problem.
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