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  #1  
Old 11-04-2022, 07:59 PM
EternalArianne EternalArianne is offline
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Default ECHO backpack blower carb replacement

Once again, I am on the receiving end of a FREE piece of equipment that has sat for many years. This time it's an ECHO PB-403T backpack blower from 2005.

I replaced the spark plug (due to no spark) and primer bulb (since it fell apart), and managed to get it to run. But the next day it won't fire up. I replaced the air and fuel filters, but still getting no fuel into the cylinder. So I guess some sediments or something got sucked from the tank and gummed up the carb.

I ordered a new OEM carb and gaskets, is there anything special I need to do as far as high/low adjustments? Or do these OEM carbs come ready to go from the factory?
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  #2  
Old 11-10-2022, 02:23 PM
mortten mortten is offline
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If it’s adjustable at there’s special tools. The screws have odd ball heads on them.
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  #3  
Old 11-10-2022, 05:13 PM
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I would check the service book, often 2 cycle stuff now comes somewhat adjusted and "capped". You can remove those caps and use the aforementioned screwdrivers to dial it in.

https://www.farmandfleet.com/product...waAlWxEALw_wcB
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Old 11-12-2022, 01:05 PM
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darkminion_17 darkminion_17 is offline
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Be sure you have the correct mix, spark plug and such.

https://www.echo-usa.com/getattachme...1c2873/filev1_
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  #5  
Old 11-13-2022, 08:30 AM
EternalArianne EternalArianne is offline
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I used an official echo tune up kit with the air filter, spark plug, and fuel filter. Spark plug gap is .65 as the manual states. Fuel is 50:1 mix as manual states.

Even with the brand new carb it runs rough, won't idle half the time, or hesitates a lot. The new one came with limiter caps in the box but not installed, so I assume it needs adjustments and put those one once it's set? But I have idea where to start with the adjustments...
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Old 11-14-2022, 10:33 AM
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ironman ironman is offline
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I'm not familiar with Echo's but other brands have problems with the exhaust clogging up.
Remove the muffler and you may find a fine mesh screen, inside the muffler or on the input. That screen can clog or there may be excessive carbon inside the muffler.
Worth a looksee.
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  #7  
Old 11-16-2022, 09:17 PM
EternalArianne EternalArianne is offline
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I will try and clean the spark arrestor screen this weekend. If still not running right, I found a local shop that said they will only charge $25 to tune the carb. They said they can do it while I wait, not even 15 mins provided nothing else is wrong. I don't foresee anything else being wrong, as I've literally done all user serviceable parts at that point!
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  #8  
Old 11-19-2022, 11:49 AM
EternalArianne EternalArianne is offline
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Well I couldn't get the muffler off to clean the spark arrestor (too rusty). But I found the problem. When I initially installed the carb I had to reuse one of the old gaskets due to the one it came with being damaged. I replaced it just now with a new one and it fired right up no issues! No hesitation or anything it just runs and blows fine
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