Ryobi petrol strimmer

[Hilfa]

I'm working on a 30cc Ryobi strimmer which won't start.
It has a new carburettor and will prime easily.
It has petrol.
It has spark.
Compression pressure is about 100lbs.
There is air moving when the starter cord is pulled.
But it doesn't appear to be feeding petrol at all.
After trying to start, I can't see petrol in the carb and the sparkplug doesn't show any petrol.
Is anyone able to offer any advice?
Thanks in advance.

[Mick]

Hi Hilfa, and welcome to TGMForum.

First thing, are you sure the new carb is the correct one?  and have you made sure the gasket between carb and inlet is the correct way around, and that the little pulse hole lines up with both the carb an the inlet.  It needs the pulse from the crankcase to make the fuel pump work.

[Hilfa]

Hi.
Thanks for replying.
The carb is a direct replacement.
I've checked that there is air coming through the port.
How much compression would you expect from this engine?

[Mick]

Not sure of the exact figure, but I guess it should run ok if between 90 - 120 psi. I very  rarely use a compression tester as over the years I've got a feel feel how good or bad it is.  Do you suspect the compression is low?

[Hilfa]

As I said initially, I measured the compression at about 100psi.
It feels a bit "soft" when I turn it over but I don't have the same touch as someone who has done this for a long time.
It does appear to be moving air through the port.

[Mick]

Just curious, and because I'm not sure exactly what model it is.  Is the carburettor on the back of the engine? Or on the side opposite the exhaust?

[Hilfa]

The carburettor is opposite to the exhaust.