emr
Cheesehead Treehouser
I don't know if you can tell from the pic but is the brownish tint to this piston normal?
Piston color
- Thread starter emr
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I don't know if you can tell from the pic but is the brownish tint to this piston normal?
Tucker943
Bamboo Plantation Owner
Ya.
emr
Cheesehead Treehouser
- Thread Starter Thread Starter
- #3
Perfect. End of thread I guess. 
Any ideas on why this saw runs like crap and smokes like a champ? It's an almost new MS250. I put a new carb in it thinking that might be it. No difference. It's got the right mix of fuel, clean air filter and new fuel filter and new spark plug.
Any ideas on why this saw runs like crap and smokes like a champ? It's an almost new MS250. I put a new carb in it thinking that might be it. No difference. It's got the right mix of fuel, clean air filter and new fuel filter and new spark plug.
Tucker943
Bamboo Plantation Owner
Don't take my words as gospel. I've seen that before in healthy saws, but I'm not a saw mechanic. My answer is "ya". The right answer might be different.
Magnus
TreeHouser
Usually this brown, some time sticky stuff comes from oil that could not handle the heat.
Black is next, then stuck ring and possible kaboom...
Black is next, then stuck ring and possible kaboom...
emr
Cheesehead Treehouser
- Thread Starter Thread Starter
- #6
Thanks for all the help. I'm obviously no mechanic either but I'm trying to learn.
This saw is not mine but a friends so I don't know the history or what kind of oil they have used.
I was wondering if he ran it with straight gas. In pretty sure he has motor oil in the bar oil tank.
I played around with the carb and got it running much better.
I really do appreciate the help you guys are giving me.
This saw is not mine but a friends so I don't know the history or what kind of oil they have used.
I was wondering if he ran it with straight gas. In pretty sure he has motor oil in the bar oil tank.
I played around with the carb and got it running much better.
I really do appreciate the help you guys are giving me.
FireFighterZero
Captain Zero!
I think it looks pretty good. Wonder what the top of the piston looks like? Air leak maybe?
squisher
THE CALM ONE!!!!
Looks fine to me too.
Moparmyway
TreeHouser
Al Smith
Mac Daddy
That smoke could be it's a tad rich on the high speed .You might lean it just a fuzz .Keep in mind a little smoke is better than a fried piston .
squisher
THE CALM ONE!!!!
You certainly can set a work saw without a tach. If in doubt pull your plug and check it. If your saw is stock you shouldn't be varying much from the factory settings.
woodworkingboy
TreeHouser
Ya, as Squish says, without a tach, but you need to know the sound that you are looking for so that the saw isn't running too lean and can risk damage. There should to be some remaining two stroking sound at max revs (WOT). Also, the adjustment on one needle can affect the other. Adjust from a richer setting to a leaner one. Carb condition can somewhat vary the specs from the factory setting, the general condition of the saw, and your location and season. Some saws the adjust never needs to be touched, others are more temperamental, has been my experience.
Cobleskill
Treehouser
I have no problem adjusting the old saws by ear. My 346 however makes me wonder if I know what I am doing. I took it to the dealer and he tached it and said you have it perfect.
A lot of new saws have a rev limiter that can sound like 2 stroking when it is cutting out. I think a tach is a good investment these days. I need to just order one instead of thinking about it.
A lot of new saws have a rev limiter that can sound like 2 stroking when it is cutting out. I think a tach is a good investment these days. I need to just order one instead of thinking about it.
woodworkingboy
TreeHouser
This has been a good tach for me for a number of years. http://www.amickssuperstore.com/DTI...chometer_Tach_p/dti tech-tach tt-20k tach.htm
One thing I find with a good tach that takes quick refreshment readings, is that the numbers really jump around. You can pretty much dial in the saw close to what you want, but at any given same carb adjustment, the numbers will jump around a number of hundred rpms different within a few seconds. I've always wondered why that is.
One thing I find with a good tach that takes quick refreshment readings, is that the numbers really jump around. You can pretty much dial in the saw close to what you want, but at any given same carb adjustment, the numbers will jump around a number of hundred rpms different within a few seconds. I've always wondered why that is.
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