Trimmer bogs when given gas

 Ryobi 775R.

I changed the spark plug and put in new fuel. It starts just fine but
when I give it gas, it just bogs down and dies. Any thoughts to why?
How can I adjust the two carb screws on top?

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 dan wrote:


Ok, the air/fuel adjustments only go one full turn. I adjusted both a
half turn going from one end of the spectrum to the other. Nothing. I
think I'm going to do a compression check - although, I have no idea
what the compression should be on this guy. I think I may inspect the
carb as well.

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 dan wrote:

If it runs at all don't waste you time with a compression test.

It is starving for fuel when you accelerate. If richening the low speed
(turn out 1/4 turn) does not make it accelerate then I would suggest
replacing the fuel with fresh (from the station, not from a can that was
filled last season) and a new fuel filter. Pay attention to the
condition of the rubber fuel line. If it's mushy or splits easily when
putting on a new fuel filter then you might as well go get a carb kit
for it also.

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Art

 Art wrote:


New fuel = Fresh fuel from the pump.

I opened part of the carb and found some "sludge". It looked like wet
sugar. Very little but I ordered a carb kit anyway. I'll post my
results.

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 dan wrote:


Cleaned and rebuilt the carb. It runs now. Saved me from having to buy
a new trimmer, although at $45 for the rebuild kit, I'm part way there.
If it lasts another year, it was worth it.

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