Ryobi String Trimmer Starting Problems???
#1
Ryobi String Trimmer Starting Problems???
I have problems starting this trimmer. I have cleaned and rebuilt carb, new gas lines and fuel filter. Says to flip yellow lever and primer bulb 7 times. It will not start. If I squirt starting fluid in it fires right up and runs perfect and idles. I can trim day and it runs great. Shut off and it will start right up. Sits overnight and I cannot get it started. Any Suggestions? Thanks


#2
Group Moderator
Have you checked out the priming system? It sounds like the primer bulb is not working. Do you see or feel the bulb fill with fuel after a few pushes?
#3
Yes, you can see gas go thru the line, as it pressurizes the tank. There are two lines on back of primer mount. Maybe it is suppose to go from tank thru primer to the other line and pump in carb. Maybe something is plugged in that?
#4
If ther primer is filling with gas, it's probably doing what it should. Does the yellow lever hold the throttle open a bit and disengage when you hit the throttle trigger?
#5
Yes it holds it open but not much. I replaced the primer. The short gas line that goes from the primer to the carb I disconnected from carb and pushed on the primer and gas did not come out of it? Even with the new primer bulb it will not start, as I said before one shot of starting fluid in carb it fires and runs great?? I am at a loss.
#11
I bought a new Ryobi 2-stroke trimmer last year. From day one I've never even tried to start it without a can of starter fluid nearby. I prime it and give it three tugs and if it doesn't start, I squirt some starter fluid around the intake without removing the filter cover. And it's rare that it doesn't start on the first tug after hitting it with the starter fluid (and this is Prestone, not the hi-ether good stuff). It never fails and to me it's a lot less headache than trying to figure out why it won't start.
#13
What does the primer bulb do? I thought it always put gas in cylinder
Your primer should be pumping gas one way from the tank, through the carb, and back to the tank. With that working the choke should start it cold.
#14
While the engine is running spray/dribble some carb/brake parts cleaner behind the carb and along the mating surfaces if the engine tempo changes you have an air leak it could be a failing gasket or a cracked insulator. Have a good one, Geo
#16
The short gas line that goes from the primer to the carb I disconnected from carb and pushed on the primer and gas did not come out of it?
#17
I started it up, sprayed brake cleaner all around gaskets on carb and did not change anything, still runs great. Yes I pulled that short hose that goes to carb again and the primer bulb does nothing with it removed just pumps air. Put back on and it pumped gas and fills the primer bulb. Actually I think it pressurizes the tank? I am at a loss.
#18
Actually I think it pressurizes the tank
There are some different types of primers, though. Some pump air into the carb bowl and force fuel up into the carb throat leading to the engine head. That may be one you were thinking of. . But fuel isn't moving through the bulb, just air.
#21
I just wanted to post an update with this trimmer. I have played with this for sometime, as I have said that if I squirt starting fluid in it runs perfect. Let it sit over night and it will not start. So this has been sitting. I pulled it out today and again it would not start. I took the carb off and I switched the gas lines on the primer bulb. It is one of the snap on bulbs that is on the air cleaner bracket. There are two pins on the bulb one long and one short. Put it back together and primed it the 7 times it says it it started right up and ran perfect. I even sent a message to ryobi and they told me I needed a new carb. Shows what they know. Hope this helps someone else that has this problem