I was given a Ryobi PLT2543Y petrol strimmer a couple of years ago, by a
relative who didn't get on with it. He wasn't alone:
http://www.reviewcentre.com/reviews141656.html

It has more or less worked for a while, but would never run without the
choke, and now will not run for more than a few seconds.
I follow the correct starting procedu
1) Switch on ignition.
2) Press priming bulb 8 times.
3) Pull cord with lever in "off" position until motor starts then dies.
4) Pull cord with lever in "choke" position.

At stage 3, the motor dies after a couple of seconds.
I've tried adjusting the red and white mixture screws. I've even tried
cutting off the plastic guards on the screws to allow more adjustment.
The manual mentions that if adjusting these screws does not work, the
strimmer should be taken to a Ryobi agent for a secret carburetor
adjustment. Any guesses as to what that might be?

My planned next steps a
1) Dismantle carburetor to see if there's anything obviously wrong, and to
try to understand what the red and white screws actually do.
2) Throw it away and buy another strimmer (I'm reluctant to pay a Ryobi
agent to try to fix an old strimmer that has such a bad reputation).

Any suggestions?

I was given a Ryobi PLT2543Y petrol strimmer a couple of years ago, by a
relative who didn't get on with it. He wasn't alone:
http://www.reviewcentre.com/reviews141656.html

It has more or less worked for a while, but would never run without the
choke, and now will not run for more than a few seconds.
I follow the correct starting procedu
1) Switch on ignition.
2) Press priming bulb 8 times.
3) Pull cord with lever in "off" position until motor starts then dies.
4) Pull cord with lever in "choke" position.

At stage 3, the motor dies after a couple of seconds.
I've tried adjusting the red and white mixture screws. I've even tried
cutting off the plastic guards on the screws to allow more adjustment.
The manual mentions that if adjusting these screws does not work, the
strimmer should be taken to a Ryobi agent for a secret carburetor
adjustment. Any guesses as to what that might be?

My planned next steps a
1) Dismantle carburetor to see if there's anything obviously wrong, and to
try to understand what the red and white screws actually do.
2) Throw it away and buy another strimmer (I'm reluctant to pay a Ryobi
agent to try to fix an old strimmer that has such a bad reputation).

Any suggestions?


Have you tried starting it on Propane? I always use it when starting my
Chinese strimmer/pole saw. Just play a propane torch (unlit of course) into
the air filter whilst pulling the cord. Mine starts instantly this way and
soon settles to run on the two stroke mix with the choke off.

As for the two screws is one just a throttle stop to set tick over speed?

The other will be the mixture screw and should be tuned for smoothest
running. Start with it set three full turns out and fine tune from there.

Mike

StrimmingStress wrote:
I was given a Ryobi PLT2543Y petrol strimmer a couple of years ago, by a
relative who didn't get on with it. He wasn't alone:
http://www.reviewcentre.com/reviews141656.html

It has more or less worked for a while, but would never run without the
choke, and now will not run for more than a few seconds.
I follow the correct starting procedu
1) Switch on ignition.
2) Press priming bulb 8 times.
3) Pull cord with lever in "off" position until motor starts then dies.
4) Pull cord with lever in "choke" position.

At stage 3, the motor dies after a couple of seconds.
I've tried adjusting the red and white mixture screws. I've even tried
cutting off the plastic guards on the screws to allow more adjustment.
The manual mentions that if adjusting these screws does not work, the
strimmer should be taken to a Ryobi agent for a secret carburetor
adjustment. Any guesses as to what that might be?

My planned next steps a
1) Dismantle carburetor to see if there's anything obviously wrong, and to
try to understand what the red and white screws actually do.
2) Throw it away and buy another strimmer (I'm reluctant to pay a Ryobi
agent to try to fix an old strimmer that has such a bad reputation).

Any suggestions?


take the clunk out and check that its clear washing through with petrol
or replacing.

The starting procedure that works for me is fill, prime with the bulb,
full choke, full throttle, and switch ON, and then pull. only take the
choke off when its happy to run without it,.



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To people who know nothing, anything is possible.
To people who know too much, it is a sad fact
that they know how little is really possible -
and how hard it is to achieve it.

"StrimmingStress" wrote in message
.com...
I was given a Ryobi PLT2543Y petrol strimmer a couple of years ago, by a
relative who didn't get on with it. He wasn't alone:
http://www.reviewcentre.com/reviews141656.html

It has more or less worked for a while, but would never run without the
choke, and now will not run for more than a few seconds.
I follow the correct starting procedu
1) Switch on ignition.
2) Press priming bulb 8 times.
3) Pull cord with lever in "off" position until motor starts then dies.
4) Pull cord with lever in "choke" position.

At stage 3, the motor dies after a couple of seconds.
I've tried adjusting the red and white mixture screws. I've even tried
cutting off the plastic guards on the screws to allow more adjustment.
The manual mentions that if adjusting these screws does not work, the
strimmer should be taken to a Ryobi agent for a secret carburetor
adjustment. Any guesses as to what that might be?

My planned next steps a
1) Dismantle carburetor to see if there's anything obviously wrong, and to
try to understand what the red and white screws actually do.
2) Throw it away and buy another strimmer (I'm reluctant to pay a Ryobi
agent to try to fix an old strimmer that has such a bad reputation).

Gunked up.
2 smokes are prone to this a bit on smaller engines. Strip the carb. clean
out the crap (Redex does this well). Reassemble and gently screw in the
mixture screw to bottom out and then out 1½ turns to start. Half choke it,
prime and start. Set revs to about half speed and get going

Mine is the same and it's a similar make, runs fine on half throttle but rev
it up and it dies until properly warm.
I have set the "Idle" speed to have it run at ¼ to ½ throttle and strim at
that speed. Less fuel consumed, less throw from the cutter meaning less
clearing up, and at low revs like that you can strim a chainlink fence
carefully giving a good clean finish without much effort or string snapping.
Lower revs also less noisy.
So set it to run at lower revs and it'll be a whole load better

On Jul 7, 2:46*pm, "StrimmingStress" wrote:
I was given a Ryobi PLT2543Y petrol strimmer

Compression? Is the cylinder barrel loose on the crankcase? Ryobi
are a bit prone to this, as the "cast-in" shakeproof ridges on the
crankcase bolts aren't too effective. If there's oil leaking from the
joint, or if the cylinder feels loose, then it's going to be low on
compression.

The fix is easy, but you need a Torx #27 as well as a #25, which isn't
a common size in the simpler sets (easy to get from most toolshops
though). Takes a few minutes.

Pop the four Torx screws from the crankcase end cover plate. Remove
the fuel tank (no need to disconnect it) and be careful not to loose
the rubber mounting bushes. Now remove the cylinder bolts and replace
them with real shakeproof washers as well. Re-attach the tank and
cover plate. Torques aren't crucial.

On Jul 7, 2:46*pm, "StrimmingStress" wrote:
I was given a Ryobi PLT2543Y petrol strimmer a couple of years ago, by a
relative who didn't get on with it. He wasn't alone:http://www.reviewcentre.com/reviews141656.html

It has more or less worked for a while, but would never run without the
choke, and now will not run for more than a few seconds.
I follow the correct starting procedu
1) Switch on ignition.
2) Press priming bulb 8 times.
3) Pull cord with lever in "off" position until motor starts then dies.
4) Pull cord with lever in "choke" position.

At stage 3, the motor dies after a couple of seconds.
I've tried adjusting the red and white mixture screws. I've even tried
cutting off the plastic guards on the screws to allow more adjustment.
The manual mentions that if adjusting these screws does not work, the
strimmer should be taken to a Ryobi agent for a secret carburetor
adjustment. Any guesses as to what that might be?

My planned next steps a
1) Dismantle carburetor to see if there's anything obviously wrong, and to
try to understand what the red and white screws actually do.
2) Throw it away and buy another strimmer (I'm reluctant to pay a Ryobi
agent to try to fix an old strimmer that has such a bad reputation).

Any suggestions?


You may find the carburretor is not a carburretor but a tiny fuel pump
run off the crankcase pressure.
Check the fuel filter first and clean out the tank fuel tank.
Sounds tome like fuel starvation

replying to Nthkentman, Wayne T wrote:
Change the carb with one that has proper adjusting screws. I did and it ran
ok. The Ryobi carb replacement will be expensive. The eBay replacement will be
better. You will need a 'pacman' adjuster screwdriver.

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