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Old 04-13-2010, 09:12 PM
Larson Lawn Care Larson Lawn Care is offline
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Redmax trimmer not running at full power

In the past when my trimmer would run slow, I'd pull off the exhaust and clean out the carbon build up behind it and change the spark plug. I cleaned it twice and replaced the spark plug but it is still running slow. When I hold the throttle trigger down and flip the choke up and down, it will run good. Any advice?
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Old 04-13-2010, 11:09 PM
GlynnC GlynnC is offline
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Possible air leak--while running, spray carb cleaner or brake parts cleaner around the base of the carb--does this change the rpm of the engine? If it does, then you have an air leak and need to replace gaskets--or maybe just tighten carb mounting screws. If it's not an air leak, and not exhaust port/muffler carbon build up, then it'll probably be dirty carb. Try running Seafoam thru carb and in fuel--do a search on Seafoam--you'll find lots of hints.
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Old 04-13-2010, 11:15 PM
Larson Lawn Care Larson Lawn Care is offline
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Thanks alot, I'll give it a try.
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Old 04-13-2010, 11:46 PM
GlynnC GlynnC is offline
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I should also have ask if it still has the spark arrestor screen in the muffler--is it clean?
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  #5  
Old 04-14-2010, 08:58 AM
Larson Lawn Care Larson Lawn Care is offline
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it looks clean
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  #6  
Old 04-14-2010, 11:52 PM
Larson Lawn Care Larson Lawn Care is offline
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Sea foam maybe helped a little. I took the airfilter cover off and took a look inside. The plastic thing that turns inside there when choke is adjusted with the hole in it (not sure what it is called) but the hole is still slightly exposed when choke is off. Is it supposed to turn until you can't see the hole anymore or have just a little bit still open?
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Old 04-15-2010, 10:04 PM
Larson Lawn Care Larson Lawn Care is offline
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Maybe my description was a bit hard to understand. In the carb, you can see the choke open for air I guess, the part is plastic and it turns to when you flip the choke on, and it closes when off, but the hole in the plastic is still exposed? Is that normal?
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  #8  
Old 04-15-2010, 11:48 PM
GlynnC GlynnC is offline
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Okay, I'm confused. Tomorrow, I'll look at a Redmax to see what you are talking about. I think you are talking about the barrel in a rotary carb--but you keep talking about it being the choke--will get back at you tomorrow.
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  #9  
Old 04-16-2010, 10:30 AM
betmr betmr is offline
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I am going to suggest you Clean and rebuild the Carburetor. I think the hole you are talking about is the opening in the barrel, and it should be open some at idle, it opens more as you increase the throttle. It does the same thing as a butterfly throttle valve, changes air flow into cylinder.

I think the little reeds in the Carb. are sticking or stiff, and the inside of Carburetor needs cleaning. That's my opinion.
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  #10  
Old 04-16-2010, 07:59 PM
Larson Lawn Care Larson Lawn Care is offline
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I just bought a shindaiwa 282, now I have time to fix the redmax and have it for a backup. I was talking about the barrel. I did shoot carb cleaner through there and it seemed to help for a little while, but it is back to running slow.
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