Help with Old Stihl 028

[ScipioUSA]

Been a while since I have worked on my saw, but isn't there a crankcase vacuum hose to the carb to supply the pressure pulses to operate the fuel pump on the bottom of the carb. I remember not getting fuel because I had not found a bad hose.
I also remember a lot of new chinese carbs which did not work and now look for OEM carbs.
The emission control carbs on the new saws don't rebuild well, but the old carbs rebuild OK with a good kit.

Yes, the 028 has an impulse line for the carb. Those can go bad, always good to replace when unsure of the condition.

 

[4Liberty]

That saw doesn’t have a compression release.

Sorry guess I thought all the MS series saws had one. That being said when I saw the pic of your piston/exhaust port my mind went right to that. That being said I’ve seen several rebuilt saws that did just that due to malfunctioning/dirty compression releases. It will lean them out big time if it’s sucking air, and they make plugs to eliminate them just for that reason.

 

[4Liberty]

My saw, a different stihl, has a compression release. Is there a problem with using these?

They make a plug to eliminate them for a reason. When the saws were new they worked great. After issues somewhere else and metal flying around where it shouldn’t, or just old age they can stick open, suck air, lean out and that’s no good. They are cheap enough just to replace on rebuilding or just eliminate them.

 

[dodge man]

I think compression release is just on pro saws? I posted when this happened and asked the cause. The general consensus was straight gas. I wasn’t the sole operator of it but almost. That said I did lend it out once and it still could’ve been me that did it. It required a new jug along with a new piston.

 

[4Liberty]

I think compression release is just on pro saws? I posted when this happened and asked the cause. The general consensus was straight gas. I wasn’t the sole operator of it but almost. That said I did lend it out once and it still could’ve been me that did it. It required a new jug along with a new piston.

Sucks when that happens. I haven’t personally had it happen but my time is probably coming. It doesn’t take much to foul up something running rpm like they do. And it’s really easy for some piece of junk to get stuck somewhere only to find it’s way when it’s running.

 

[alana1]

Long story short, I have enough chainsaws to remove the entire Brazilian rainforest if needed. That being said, take the 30 mins required to replace all the fuel lines to and from the carb. Thats the biggest issue with most of these saws. Amazon sells kits or your local hardware store for under $10. You will be a happy wood cutter in no time

 

[gatornapper]

One thing to consider is possibly that the base gasket/seal between the cylinder and the case may be leaking.

Yes - this is exactly what killed my Stihl 021 I ran for 25 years that suddenly would not start. Can be fixed, but best just buy a new saw.....

GN

 

[777Airmech]

Not a big poster here but wanted to let you know I have never had any luck with the Amazon Chinese carbs. I have a Echo Trimmer that I was trying to fix because it was just given to me from a friend that was moving. Until I bought the manufactures carb it did not want to run at all. You may think your saving money but how much is your time worth (i spent hours), and do you want it to be a dependable saw What good is it of your always messing with it ? I just pay the money up front the first time and be done with it...The posters here have had a lot of good info and if you have done it all (Compression, fuel lines, the little filter in the tank, I would go back to the carb, also check the spark plug if its dumping fuel, clean it and make sure it dry.... Hope its fixed soon!

 

[dodge man]

I’ve also had bad luck with cheap carbs, in my case a Lawn Boy two stroke.

 

[WinterDeere]

Opposite experience, here. I have replaced many leaf blower or chainsaw carbs from Amazon, and have never received a bad one. Maybe I just pay more attention to the reviews, than some of you guys?

They do sell some junk, but also some parts with long records of satisfied customers. Buy the one with 1200 reviews averaging 4.7 stars, not the one with 6 reviews averaging 2.3 stars.