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Rough low throttle on Lawnboy Dura Force Pro 6.5

I just picked up a Lawnboy Dura Force Pro 6.5 (10323). It starts easy and appears to run well at full throttle but low throttle is a bit sensitive; It's difficult to keep a strong low idle and replacing the spark plug had little effect. I was advised to clean or replace the inline fuel filter before attempting to adjust the carb settings but I do not see any inline filter. Is there such a filter on this model? If so, where is it located and can you also point out where the carb adjustment screws are? Are they be adjusted with the engine running or not running? Is there a carb cleaning fuel additive for these two cycle engines? Excuse the simple questions but I am not familiar with Lawn Boy mowers and do not have a manual or engine schematic. Thanks in advance for any assistance.

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Go to the Lawn-Boy Service & Support site to get a manual.
The procedure should be in the operators manual.
Seafoam gas additive is a good one.

Posted on Oct 22, 2009

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Posted on Sep 30, 2009

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Husqvarna 125 BV how to adjust carb screws, yes I can turn them but how to start all the way in on both screws

I would think that the screws have limiter caps, so you cannot turn them all the way in.
1) put both screws at the maximum you can turn them out
2) start and warm up the engine
3) at idle speed, turn the L needle in till the engine speeds up (by itself) and then starts to lower rpms.
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does the engine stumble and then finally begin to pick up?
Then turn the H out about 1/4 turn. If needed for rough but smooth running, turn the H out again another 1/4 turn.
*Please Note: 2cycle engines should ALWAYS sound just a little rough at full rpms. NEVER adjust a carburetor so that the engine 'screams', you will not have an engine for very long at that condition.

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Hi Nancy,
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Good Luck!

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Where is the egine model number located on a Lawn

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How to tune and adjust carb settings on Lawnboy 2 cycle, 6.5 Duraforce slver pro engine? Throttle appears good at high throttle position but is not smooth throughout range and rough at low throttle...

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