026 problems

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Going to have to order that tool, got some SDCs to rebuild soon to so it will get used. Will do the pressure test when I pull the carb again, just to rule it out. I am fairly confident thats not the problem, but since its not my saw I would like to be certain. Got some wire to replace the ground wire I smashed. Next time I get to work on it I will try setting the lever to .030 and see if that improves the problem.
 
Fixed the ground wire and adjusted the metering lever to as close to .030 as I could get it. That seemed to make a big improvement, I know the lever is still a little high but it is running a lot better than before. I have the tool on the way and will adjust it accordingly when it gets here, but for now it seems the metering lever might well be the culprit.
 
Got the tool for the metering lever, got the right vent, and went through everything again. Still not running right:msp_angry:. At this point I can not find a reason why it should not run well, everything checks out. First tank of fuel it would sputter occasionally, but for the most part ran and cut well. The only time it would falter was when you were digging in while cutting, sounded almost like a miss here and there. Took a break for a bit refueled it and took it back out and it had no power. Ran great WOT with no load, sounded great like it really wanted to do some cutting. As soon as it touched would it would just go blah, no balls at all and just bog down and the stop the chain. Not sure where to even start. Thought about the coil but wouldnt that act up with or without cutting. Carb was cleaned several times, all passages seemed to be clear and free flowing. Not real sure what to do next?
 
Brian13 said:
Compression was 165, and it will start on one pull or two when warmed up, starts normal when cold.
Click to expand...

Well that sorta rules out the low compression and bad module senario, both can cause low power in the cut. Still sounds like fuel delivery, leans out in the cut like the carb is not flowing enough fuel to make power. I can hear that if I am running a saw but its really hard to tell someone else what it sounds like.
 
Its really weird. It sounded like it was missing. For the first tank it would cut fine for the most part, 4stroke out of the cut and pretty much clean up in the cut. But every now and again it would sound like it was missing. Second tank, it sounded great no load but when you put it in wood it sounded almost like it was flooding out mixed with the chain brake engaged. It didnt sound like it was going lean to me in the cut. Only thing I can think of from here is to just start replacing seals and other rubber parts until it runs right. It just dosnt sound like an airleak. High end rpms are very stable, its not racing. Unless when pushing it in the wood opens something up.
 
I have seen a few that the AV mounts were worn/soft enough to allow enough engine to handle movement that the carb boot got a rip in it, the engine ran ok until it got put in the wood and then the saw flexed enough that the boot would open up and allow too much air in, the engine would fall on its face.
 
I will do run vac/pressure test again and flex it and see if it changes anything. If I have to keep replacing things, the guy I am fixing it for isnt going to want to bother with it and I will end up with it. I win either way, but I would like to get his saw back to him if I can.
 
Check the boot hose clamp. I've had them crack under the screw and appear to be tight but loosen with vibration and flexing. Your boot may not be seated properly or a small hole that open with flexing. Great saw when running right, but can really test you when not. :confused:
 
This thing has me baffled. I just did a vac test moved it all around, the av is sloppy but didnt effect the vac pressure. Did a pressure test(my gauge dosnt do pressure so I have to turn down the compressor to about 5ish lbs.) and both seals are good. Cant find a obvious leak anywhere. I am stumped on what to do. There is nothing just jumping out saying fix me LOL.
 
It's really too bad you don't have a loaner carb to check things out. Know anyone with an 026 around you? I will say, if the fuel line was so desperately mangled, it could well be that the impulse line was not far behind. To check them you really need to stretch them out a bit.... and they are cheap. I'd replace it.

The other move I would recommend would be an ultrasonic cleaning of the carb.
 
I have a post up right now,(symptoms of leaky seals????) you sound like your describing my 028 to a "T" I'm leaning towards ignition it does the exact thing I have changed carbs and cleaned and kitted both no change , even changed plug wire no change hope you figure it out for all of us , ignition ????
 
Pendagator said:
I've been working on an 026 too and I'm not so sure about my tank vent either. Your tank vent doesn't look like the one's in the IPL's. Check out this thread http://www.arboristsite.com/chainsaw/45911.htm That thread shows an IPL ( upside down). The vent it takes depends on when the saw was made. I thought about using a clear hose like you have, stuffing some air filter foam in it for a filter, and then adding the 1110 353 1600 "tit" they talk about in that thread. I don't know if that would work or not.
Click to expand...

The 1110 353 1600 "tit" is a one-way rubber check valve, installed inside the tank under the vent. It allows air to come in to replace fuel going out, but does not allow vapors out through the vent. I recommend people installing these on the older saws that do not have them. They do help with performance. They allow the tank to build pressure and push fuel up into the carb.
 
I wish I had a good coil and carb to try out, but this is the only 026 in my possession at the moment. If it was my saw I would just start replacing things until it ran right LOL. And it might end up working out like that. The guy it belongs to dosnt want to put a ton of money into is because it will just be a spare. He is a good friend of my dads and a good guy all around, and I would like to help him out if I can. Top end is in perfect shape, so to me its worth fixing. For now I just have to wait until I can get a hold of him and see what he wants to do. I thought this was going to be an easy fix LOL.
 

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