Stihl 041FB lacks top end power/ gasket question

[elittle]

I bought a old farm boss to try my hand at taking one apart and trying to rebuild it for something fun to do.

I rebuilt the carb and it started on the 2nd pull. It will only idle around 1800rpm and at full throttle is about 2800rpm.

It will idle all day. I throttle it up, it sounds boggy, but doesn't die when i let off the gas. The carb kit i bought had extra gaskets in it, i can't figure out where they go.those 2 black ones and 1 extra green one. Anybody know where these go lol?

It could be an air leak i guess. It seems to get fuel just fine. I rebuilt the carb, new fuel lines and filter, new air filter, cleaned out muffler and spark arrestor, all new eleventeen gaskets on the intake stack. Compression is 170.

Any ideas about where those gaskets go would be appreciated, unless they are for a different carb model, i replaced every gasket on the intake/carb. The carb is a tillotson, tralee ireland marked. It was missing the pump side gasket when I took it apart. I'm wondering if the high jet might be plugged. I didn't do the Welch plugs but will try that next?

 

[elittle]

Gremlins... i took the carb off. Retightened the intake stack. Put the high and low at 1 turn each, and this thing is screaming. I think a gasket didn't seal right maybe.

 

[elittle]

Before it would bog in the cut, no power, it just did this:
it works! Now I need to find a new sprocket.

 

[Bob95065]

If I were you I would do a vacuum/pressure rest on that saw. The intake gas a stack of gaskets that can leak. Most problematic are the crankshaft seals, the PTO side has an outer seal that goes between the case and oil pump gear along with an inner seal between the oil pump gear ID and crankshaft. That inner seal likes to leak and is a pain in the neck to replace.

 

[elittle]

Yeah, i bought it just to play with. I don't have a ton of spare parts around for it and i don't want to invest a bunch in it. I got it running well enough to use at the moment so I'm going to enjoy it while it lasts then put it on display in the garage.
It's a nice reminder how products used to be built to last, not made from chinesium junk.

 

[Bob95065]

Years ago I answered a craigslist ad for two chainsaws in a milk crate. When I went to pick them up I found two 041s torn down to the crankcases and a jar of small parts. One was a Super. I had it in my garage for years, and even offered it on the Christmas giveaway thread and had no takers. Eventually I got sick of looking at those basket cases and built one running saw out of the parts. Later a friend gave me a second 041. Word got around that I like those saws and I was given two more. Last fall a friend gave me a second Super with a 24" B/C and a full wrap handlebar. I started with a craigslist ad now I'm swimming in 041s

They are heavy, loud and eat wood. They'll last a lifetime if you treat them right. They've kinda grown on me over the years. I hate to see yours lock up due to an air leak. If you search for vacuum test you'll learn another skill key for rebuilding saws and diagnosing problems. I cut bicycle inner tubes for sealing the intake and exhaust. You can get a spark plug port and vacuum pump on Amazon. I've made intake ports out if scrap aluminum plate and hose park fittings. You really don't know what you have until you pull vacuum on that crankcase.

 

[elittle]

Years ago I answered a craigslist ad for two chainsaws in a milk crate. When I went to pick them up I found two 041s torn down to the crankcases and a jar of small parts. One was a Super. I had it in my garage for years, and even offered it on the Christmas giveaway thread and had no takers. Eventually I got sick of looking at those basket cases and built one running saw out of the parts. Later a friend gave me a second 041. Word got around that I like those saws and I was given two more. Last fall a friend gave me a second Super with a 24" B/C and a full wrap handlebar. I started with a craigslist ad now I'm swimming in 041s

They are heavy, loud and eat wood. They'll last a lifetime if you treat them right. They've kinda grown on me over the years. I hate to see yours lock up due to an air leak. If you search for vacuum test you'll learn another skill key for rebuilding saws and diagnosing problems. I cut bicycle inner tubes for sealing the intake and exhaust. You can get a spark plug port and vacuum pump on Amazon. I've made intake ports out if scrap aluminum plate and hose park fittings. You really don't know what you have until you pull vacuum on that crankcase.

When i rebuilt the carb i didn't tighten down the giant intake stack enough. The 2 nuts on the top above the carb were kind of loose and it was letting air in, i could see gas leaking out on the bottom gasket.

I tightened it up and set the carb to 1 turn on high and low and it started right up. No more smoke dumping from the exhaust, instant throttle response and plenty of power at full throttle. I used a tachometer and set the high to 8000rpm. Idles at 2100/2200 and sounds great. I know it should be at 10k but I'm waiting to get a better tachometer before I do that. It cuts great but a bit slow from the slower RPM.

I'm going to invest in a mityvac vac and pressure test gauge since I'm accumulating saws like crazy. CA decided to outlaw them so I started buying all kinds of gas powered equipment and got addicted.

I bought a 661 magnum a few weeks ago, I can't even figure out how to get the air filter base off the saw, they sure complicated the hell out of these over the years. This 041 is a dream to service.

Thanks for the tips.

 

[singinwoodwackr]

The 041 will pull a 28” with no problems. If you are not experiencing any “air leak” symptoms I would run it.
Vac/pressure testing is pretty much mandatory on any used, mystery saw.

 

[elittle]

do you happen to know if the 041FB uses the same chain tensioner as the 041AV? My screw is bent and i need to replace it. I just ordered 2 new bar studs in case I screw them up getting them out.

 

[singinwoodwackr]

do you happen to know if the 041FB uses the same chain tensioner as the 041AV? My screw is bent and i need to replace it. I just ordered 2 new bar studs in case I screw them up getting them out.

Should all be the same
I’ve carefully taken the bend out of more than a few tensioner bolts…assuming you can’t find a replacement

 

[elittle]

Thanks for all the info!

 

[singinwoodwackr]

Thanks for all the info!

https://chainsawr.com/products/stih...10-664-1500-new-1?_pos=1&_sid=a2944a1fb&_ss=r

 

[elittle]

https://chainsawr.com/products/stih...10-664-1500-new-1?_pos=1&_sid=a2944a1fb&_ss=r

Jesus, thanks for the link to the biggest website on the planet of used chainsaw parts... lol. I see money leaving my wallet in the future.

 

[singinwoodwackr]

Jesus, thanks for the link to the biggest website on the planet of used chainsaw parts... lol. I see money leaving my wallet in the future.

They are great. Fast ship, reasonable prices, etc

 

[stihltech]

Those intake blocks will warp over time. I always flatten the lower side (towards the cylinder on a belt sander (finer grit). That solves the issue.
AND don't forget to check the vent in the gas cap. Every other one is plugged

 

[Bob95065]

Sounds like you are on your way to getting it ready to cut some wood.

Where is Nor Cal are you?