Hello:
A friend sent me his Brand New ryobi converted by hiimself using commecrcial parts for that. He went all the way and used a C&H ignition also.
He did not make the engine to run in the trimmer before, so he took it completely new and directly converted to R/C. One in the set stands he could´n started it,and there comes all the problems.

He sent this to me to help with the carburation or determine wich was the real propblem.
I check the ignition point and it was fine, also the compression and everything in the engine seems to be well.
After some attemps I discover that the perfect running was obtained with the high needle opened 3/4 turn and the low needle 1/2 turn ( in my ryobis both are around 1,5 turns...

The engine will start when choked but little by little start to diminish rpms until totally stops and from then on is very difficult to start them again like the first time. If I take a recess of 10 -15 minutes it ill start esasily again

I dissambled the cylinder and found that the piston is single ringed and the cylinder has the nasty slots in the upper chambers...( california complaint rules...!!) I guess those engines had doubled ringed pistons.

Well, the story goes like this: Once the engine start a little flooded I started to close the needles obtaining great minumums and max rpms, but after a minute or so at full throttle the engine starts to quit until die...and there fore is very hard to start it again.


What could be the problem??
None of my four ryobis work like that.-
The degree calculation for the ignition is right, I guess it has something to deal with fuel feeding, so I told him to try a new carburetor from other engine, better a larger one.


Any inputs or stories related to this problem will be appreciatted.

Rodolfo.