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Ryobi Blower Engine Trouble

#1

K

keyser318

Hello every one I have a ryobi back pack blower RY08570. I have replaced the spark plug, replaced the gas with a premixed 50:1 fuel to oil ratio, cleaned the carburetor, removed the muffler and spark arrestor. It does not appear that the exhaust port is dirty or obstructed nor did it appear as though the carburetor was dirty. When I run it without the muffler, spark arrestor or filter on I appear to have the same problem that I had before. It is difficult to start but seems to run ok at choke speed once you start it up. I let it run at choke for 5 minute and it seemed to keep going. Once you try to open the throttle it will open up and seem to be running but then die. Once you get past this point if you don't kill it and let it return to idle, it struggles and dies once you try to open the throttle again. It appears as though it is a fuel problem since it starts off ok then dies. The one part I did not take apart in the carburetor is the pin mechanism because there was no screw to undo to take it out and I was afraid I would break it. Does anyone have an idea of what it might be? Is it possible I didn't get the carburetor very clean?

Thanks!


#2

Carscw

Carscw

Is the primer bulb staying full of gas?


#3

K

keyser318

Yes. So far it has (about 2 hours) since I put it back together


#4

K

keyser318

I ran it yesterday and it was hard to prime meaning the bulb waa hard to push in and didnt want to pop back out. I had to start it with starter fluid. It started easy with fluid and ran pretty good for 10-15 minutes then died and would start back up




QUOTE=keyser318;135468]Yes. So far it has (about 2 hours) since I put it back together[/QUOTE]


#5

W

Woody71

Have you tried adjusting the hi mixture screw on the carb?


#6

K

keyser318

I have not. I might be missing it, but I only see a throttle/idle adjustment screw. Is it possible it doesn't have one?


#7

W

Woody71

keyser318 said:
I have not. I might be missing it, but I only see a throttle/idle adjustment screw. Is it possible it doesn't have one?
Click to expand...

Reason I asked is I'm having a similar issue with my blower and came across the mixture screw adjustments. Starts great and runs good at full throttle. Problem is it cuts off during idle. I did everything you did.

I took it up to a local OPE shop to get the right size fuel line. Told him what was going on. He took one look at the fuel lines and said they didn't need to be replaced. He took it outside fired it up and started adjusting the H'L mixture screws. Took it home, fired it up and it runs better than it ever has.


#8

D

DaveTN

Woody71 said:
Reason I asked is I'm having a similar issue with my blower and came across the mixture screw adjustments. Starts great and runs good at full throttle. Problem is it cuts off during idle. I did everything you did.

I took it up to a local OPE shop to get the right size fuel line. Told him what was going on. He took one look at the fuel lines and said they didn't need to be replaced. He took it outside fired it up and started adjusting the H'L mixture screws. Took it home, fired it up and it runs better than it ever has.
Click to expand...

When it won't idle or won't throttle up the "L" Low Side needs to be enriched. (counter-clockwise). When it throttles up like it should leave it alone. When you give it 1/2 to 3/4 throttle to cut and it bogs down, turn the "H" High Side either way until you hit the maximum RPM! The High side controls the high speed operation. These recommendations from the mfg to bottom the screws then turn ccw so many turns and a half etc. is only a general adjustmet to get it to run. You will have to tweak it from there to make it run efficiently.


#9

K

keyser318

All I see is an idle adjustment speed screw. I will be taking off the carburetor again to try and clean it again. The part I didnt get cleaned was the need pin valve that is underneath the membrane and spring loaded. In my experience those are usually held in place by a screw but in this case it is snapped into place. I replaced the gas cap because it was leaking a little bit. It seems to be running a little bit better but still dies out. Still the same problem where if you open it up it runs great but then quickly runs out of gas and dies. Could this problem have anything to do with the fuel lines?


#10

K

keyser318

ok. I took the carburetor apart again and did a full cleaning and now it doesnt seem to want to run at all.


#11

W

Woody71

DaveTN said:
When it won't idle or won't throttle up the "L" Low Side needs to be enriched. (counter-clockwise). When it throttles up like it should leave it alone. When you give it 1/2 to 3/4 throttle to cut and it bogs down, turn the "H" High Side either way until you hit the maximum RPM! The High side controls the high speed operation. These recommendations from the mfg to bottom the screws then turn ccw so many turns and a half etc. is only a general adjustmet to get it to run. You will have to tweak it from there to make it run efficiently.
Click to expand...
Thanks for the tips Dave. It runs much better. I used it on Sat and it idled great. It drops down when I pull the trigger before going to full throttle. How can I tweak the H/L screws to get rid of this "drop"? L screw 1/8 counter clockwise?


#12

K

Koala

keyser318 said:
Hello every one I have a ryobi back pack blower RY08570. I have replaced the spark plug, replaced the gas with a premixed 50:1 fuel to oil ratio, cleaned the carburetor, removed the muffler and spark arrestor. It does not appear that the exhaust port is dirty or obstructed nor did it appear as though the carburetor was dirty. When I run it without the muffler, spark arrestor or filter on I appear to have the same problem that I had before. It is difficult to start but seems to run ok at choke speed once you start it up. I let it run at choke for 5 minute and it seemed to keep going. Once you try to open the throttle it will open up and seem to be running but then die. Once you get past this point if you don't kill it and let it return to idle, it struggles and dies once you try to open the throttle again. It appears as though it is a fuel problem since it starts off ok then dies. The one part I did not take apart in the carburetor is the pin mechanism because there was no screw to undo to take it out and I was afraid I would break it. Does anyone have an idea of what it might be? Is it possible I didn't get the carburetor very clean?

Thanks!
Click to expand...

On this model, there is what I would call a factory defect. There is a tiny hole in the heat dam gasket on the engine side of the carburetor that is situated too close to the large air intake hole. The gasket will eventually fret away between the small hole and the large hole due to the high velocity air flow. The end result is that the small hole opens up to the large hole causing the carb to supply too little fuel and bog when you rev it up. Replace the heat dam gasket and the blower will work properly.


#13

P

planet zero

Koala said:
On this model, there is what I would call a factory defect. There is a tiny hole in the heat dam gasket on the engine side of the carburetor that is situated too close to the large air intake hole. The gasket will eventually fret away between the small hole and the large hole due to the high velocity air flow. The end result is that the small hole opens up to the large hole causing the carb to supply too little fuel and bog when you rev it up. Replace the heat dam gasket and the blower will work properly.
Click to expand...

Yes!!!! I spent so much time replacing parts and trying to mess with the carb settings. I eventually replaced the carb with no luck, until I found your reply!! You were right. I cut out the the old gasket, replaced it, and it works great!!! I ended up buying a replacement carb kit from ebay (they're also on amazon), and it comes with a new carb and all the accessories (fuel filter, lines, gaskets, specialty tool for adjusting the carb, etc...) for $16!! Had I read your comment earlier I would have just bought the gasket, but for that price, it's not bad.

Thanks for saving me a lot of money!!


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