rsmraider
New OPE Member
Hello Everyone,
I purchased an Echo 590 last year in September. I use it mainly for firewood and have not been cutting often until last month; I used it to clear out a large area around our camp. I have been running it a little bit rich since after I received it. I had to take it apart and clear out lot of carbon after it quit and would not start again 2 weeks ago. The piston was covered with carbon and there was some inside the top end. After I cleaned the carbon I put it back together and it was running good.
These are the only modifications I have done to the chainsaw so far. I have slightly enlarged the exhaust port to match the exhaust gasket and muffler opening using locksmith files. I was careful not to go too close to the inner cylinder edge so I do not mess with the timing. I did a muffler mild muffler mod with a couple of little holes bypassing the baffle. I have also removed the inner plate on the exhaust guide.
I have been wanting to port this chainsaw but I am new to porting. I read Echo CS 590,600,620 port/mod and a couple of more forums that have good information about porting. The squish is 0.35 after the base gasket delete for this chainsaw. I do not know if I will be messing with the squish and if I do it will have to be with only files. I do not have equipment to shave off any of the metal nor will I be getting any. The shipping for everything is crazy to Rural Alaska.
I do not have a good way to check the timing. I tried printing a degree wheel and taping it to cardboard but it is giving me a different numbers. They within 2-5* every time I try to check when the exhaust or intake opens but I don't know if I should trust it. There are imperfections inside the transfers which I still need to remove. I noticed that the cylinder was scored on the intake side after I took it apart again. It is not bad but my fingernail is able to catch on the area. I do not have any way to hone the area at the moment.
Would widening the intake and exhaust port be okay without messing with the port timings?
I purchased an Echo 590 last year in September. I use it mainly for firewood and have not been cutting often until last month; I used it to clear out a large area around our camp. I have been running it a little bit rich since after I received it. I had to take it apart and clear out lot of carbon after it quit and would not start again 2 weeks ago. The piston was covered with carbon and there was some inside the top end. After I cleaned the carbon I put it back together and it was running good.
These are the only modifications I have done to the chainsaw so far. I have slightly enlarged the exhaust port to match the exhaust gasket and muffler opening using locksmith files. I was careful not to go too close to the inner cylinder edge so I do not mess with the timing. I did a muffler mild muffler mod with a couple of little holes bypassing the baffle. I have also removed the inner plate on the exhaust guide.
I have been wanting to port this chainsaw but I am new to porting. I read Echo CS 590,600,620 port/mod and a couple of more forums that have good information about porting. The squish is 0.35 after the base gasket delete for this chainsaw. I do not know if I will be messing with the squish and if I do it will have to be with only files. I do not have equipment to shave off any of the metal nor will I be getting any. The shipping for everything is crazy to Rural Alaska.
I do not have a good way to check the timing. I tried printing a degree wheel and taping it to cardboard but it is giving me a different numbers. They within 2-5* every time I try to check when the exhaust or intake opens but I don't know if I should trust it. There are imperfections inside the transfers which I still need to remove. I noticed that the cylinder was scored on the intake side after I took it apart again. It is not bad but my fingernail is able to catch on the area. I do not have any way to hone the area at the moment.
Would widening the intake and exhaust port be okay without messing with the port timings?