chain saw, maybe carb issue

[1990C4S]

Originally Posted by LWJ

I vote to fix your saw.

A saw that runs well is a pleasure to use. Worth some effort to fix it.

[look 171]

Spark arrestor screen is clean due to little use. I am tempted to just remove the fuel filter to test it. It has fresh fuel. I always put away small engines with fuel drained. Only fuel in a can is used. I think all fuels in CA has ethanol mixed into it. Will play with it some more later today.

[KFC911]

How old is the fuel in the can? If it has Evilnol ... I'd go batteries

[look 171]

Originally Posted by KC911

How old is the fuel in the can? If it has Evilnol ... I'd go batteries

3 months

[cabmandone]

Something that might help if you have the carb tool is turning the high side screw in and counting the turns to bottom out. Once you know how far from bottomed out it is back it all the way out and act like you're trying to start it. Sometimes if there's a little debris it will clear. Once you've done that, bottom it out and then back it out the number of turns you counted.

[look 171]

Originally Posted by cabmandone

Something that might help if you have the carb tool is turning the high side screw in and counting the turns to bottom out. Once you know how far from bottomed out it is back it all the way out and act like you're trying to start it. Sometimes if there's a little debris it will clear. Once you've done that, bottom it out and then back it out the number of turns you counted.

Great idea, thanks

[dad911]

Change the fuel lines. Alcohol in gas screws them up.

[look 171]

^^^ Got it, thanks

[look 171]

Ok, so I back off the high screw and it seems to run OK, a no more bogging at full throttle but not smooth like it was. After full throttle for about 3-4 min, it go hot, so hot that the plastic cover started to melt (pic where it say Echo). It smoked about 30 second of running it. I was thinking oil but that cover there got super hot and I can't touch it. Tips?

Smoke is coming from behind that cover. I have to open it up to see but its too hot now.

Noticed the oil, it dripped that much jsut from 3-4 min of running with the chain disengaged. Oil is only at 15-20% to full.

[Baz]

Originally Posted by look 171

After full throttle for about 3-4 min

Just to clarify.....you held the throttle trigger all the way in for 3-4 minutes straight?

And while not doing any cutting?

Just WOT for 3-4 minutes straight?

Thanks!

[look 171]

Originally Posted by Baz

Just to clarify.....you held the throttle trigger all the way in for 3-4 minutes straight?

And while not doing any cutting?

Just WOT for 3-4 minutes straight?

Thanks!

Yes, chain was not engaged or not turning

[porsche930dude]

You just burnt up the clutch. Probably melted the housing too thats why all the oil is leaking out. I got a brand new stihl at tthe curb somebody did that to. It took some doing to fix all the damage

[908/930]

Full throttle with the chain brake on? And it got hot, lol. Don't do that.

[look 171]

Originally Posted by 908/930

Full throttle with the chain brake on? And it got hot, lol. Don't do that.

Oh siht, is that that thing is, a brake? I thought it engages a clutch or something that keeps the chain off the gears to keep it from turning the chain. Did I screwed something up? Now the damn oil, I have to find out what to do about it dripping so much

[908/930]

Lol, pretty sure it is a brake. Not sure what if any damage it would do, should be pretty easy to remove the cover and check on the clutch, pretty sure there is a bearing in there somewhere that could use some grease now. Is there an adjustment screw for chain oil delivery on that saw?

[greglepore]

Lucky it didn't catch fire. Yeah, that's a chain brake-designed so if saw kicks back there's a chance the hand guard gets hit and it stop the chain before it opens up your face and forehead. Ooops.

[1990C4S]

Glad I learned something at someone else's expense....

[911 Rod]

Now you know it's not the carb (anymore)

[Baz]

Originally Posted by look 171

Oh siht, is that that thing is, a brake? I thought it engages a clutch or something that keeps the chain off the gears to keep it from turning the chain. Did I screwed something up? Now the damn oil, I have to find out what to do about it dripping so much

The large plastic rectangular handle on top of the machine is the "brake". Moving it forward or backwards will release it - or set it. It's a safety feature.

If you take the side cover off, there's a metal band that will engage on the flywheel when the brake is engaged. Running the saw with the metal band engaged on the metal wheel is what did the melting from the friction creating heat.

I had to replace one many years ago, so it may be repairable, unless it will still work.

[wdfifteen]

The "metal wheel" that that brake band contracts around is the centrifugal clutch drum. The cog that drives the chain is usually a permanent part of the drum on small saws. It is a wear item, so it often gets replaced and ought to be readily available. The clutch shoes inside the drum might be roasted from the heat. The heat may also have roasted a rubber oil line for the chain oiler, and that might be the source of the oil. Check YouTube University for a video on how to change the clutch on that saw.
Repairing it CAN be a DIY project, but there are so many items that could have been damaged that I would turn it over to someone with experience with these saws.