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#1
11-04-2022, 08:59 PM
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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
11-10-2022, 03:23 PM
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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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Doug Dad's 122 w/42" cast deck, spring assist, lights,weights, rear lift 1250 w/hydraulic lift, lights,weights, spring assist. 50C deck converted to an A with front wheels 44C deck converted to an A with front wheels. QA-36A 42" blade
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#3
11-10-2022, 06:13 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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Why Farm Half When You Can Farmall? 1282 | 44C Deck, Chains, 42" Blade, Cast Weights, 020" Over K301 * 1711 | 50C Deck, #1 Rear Rototiller w/ Extensions, Sleeve Hitch, KT17S Series II 24302 --> CH18S * 1811 | 46 GT Deck, 42" Blade, Chains, M18 Magnum, Sleeve Hitch * 1782 | 60" #375 Deck, Kubota D640 Diesel * 1862 | #450 Snowblower, M18 Magnum * 782 | Y/W KT17 Series II, Sleeve Hitch * 984 | Y/W Onan/Linamar 20HP, Sims Cab, CAT 0 3 PT w/ Rear PTO, 60" #374 Deck
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#4
11-12-2022, 02:05 PM
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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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Up to 530 and counting... I give up updating my profile!
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#5
11-13-2022, 09:30 AM
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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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#6
11-14-2022, 11:33 AM
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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
11-16-2022, 10:17 PM
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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
11-19-2022, 12:49 PM
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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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