I will admit I'm an amateur when it comes to tuning. I have a tach and use it, and also am fairly sure what I'm listening to as far as 4 stroking. I have saws that predate my current knowledge so I figured I'd pull the muffler and have a look. All looks well. Gas is ethanol free 91 octane mixed 50:1 with aimsoil saber.
Pp5020. Tuned 300 rpm under max rpm(12700) tuning by ear ends up around here as well. When I take muffler off I see a layer of oil everywhere. Everything looks great. Use it alot to see how long it will last cause I didn't pay much for it.
Dolmar 5105 muffler is a pain to take off so I dont bother. Never touched tuning its 200 rpm under max and runs superb.
Dolmar 6100. Used it hard last weekend cutting stumps. Long bar minutes at a time full throddle. Let it idle 5 to 10 seconds after last cut. Pulled muffler hours later, slowly pulled engine over and I see a layer of visible blue oil everywhere. Looks brand new inside.
Shindaiwa 446s. Love this saw, light powerful starts easy. But this one gets me. I rebuilt it with a new piston after it scored origional due to air leak. Air leak was fixed(gas line) max rpm according to manual is 13500. My ear agrees. I ran it for a bunch of tanks at 12800. Recently bumped it up to 13200. Nervous to go heigher. I pulled muffler twice now, once at each rpm setting and while the engine looks great I see no oil film. Of course there is a thin something there but nothing like the other saws. If I raise the piston on the others and wait 15 seconds I can see the blue layer of excess come down from the rings. This one is almost dry! Nothings scored everything fine but there is no excess lube to be found not even a bit.
This engine is not stratified like the 5020 and 6100. If that could make a difference. I'd hate to blow it up.
Pp5020. Tuned 300 rpm under max rpm(12700) tuning by ear ends up around here as well. When I take muffler off I see a layer of oil everywhere. Everything looks great. Use it alot to see how long it will last cause I didn't pay much for it.
Dolmar 5105 muffler is a pain to take off so I dont bother. Never touched tuning its 200 rpm under max and runs superb.
Dolmar 6100. Used it hard last weekend cutting stumps. Long bar minutes at a time full throddle. Let it idle 5 to 10 seconds after last cut. Pulled muffler hours later, slowly pulled engine over and I see a layer of visible blue oil everywhere. Looks brand new inside.
Shindaiwa 446s. Love this saw, light powerful starts easy. But this one gets me. I rebuilt it with a new piston after it scored origional due to air leak. Air leak was fixed(gas line) max rpm according to manual is 13500. My ear agrees. I ran it for a bunch of tanks at 12800. Recently bumped it up to 13200. Nervous to go heigher. I pulled muffler twice now, once at each rpm setting and while the engine looks great I see no oil film. Of course there is a thin something there but nothing like the other saws. If I raise the piston on the others and wait 15 seconds I can see the blue layer of excess come down from the rings. This one is almost dry! Nothings scored everything fine but there is no excess lube to be found not even a bit.
This engine is not stratified like the 5020 and 6100. If that could make a difference. I'd hate to blow it up.
