Trent Curtis
ArboristSite Guru
Fuel breather might be plugged.
Immediately after it dies, open the fuel cap and see if there’s suction.
What he said ^^^^
Fuel breather might be plugged.
Immediately after it dies, open the fuel cap and see if there’s suction.
Wow I didn’t know that could cause it to run lean! I’d have thought it would do the opposite - if anything too much fuel gets sucked, can you explain more? Thanks for sharing !I'm going with no tank vent, saw runs lean and dies.
Ah yep it was my guess as to why the saw died - I wrote this earlier and then saw your post and got confused!No equalizing air can get in as fuel is burnt so a vacuum forms in the fuel tank and starves the saw for fuel causing it to run lean.
Actually one of my first lessons working on a saw. I had a 046 that I rebuilt the carb and replaced the fuel filter, fuel hose, impulse line etc. Then I asked on the forums why my saw would run great for about a minute then die and someone put me onto the tank vent. Changed it and everything worked great after
If he has any questions on tuning there are many great YouTube videos in how to tune by ear. A little too rich is definitely better than too lean! And the highest RPM the saw will reach out of the wood is actually too lean.Update: it was hard for him to attach fuel line back to fuel tank vent (it's the white plastic, right?). He spent more time than he wanted on that. When I finally saw that happening, I suggested the heat gun. Seemed to work real good, I'm guessing it doesn't hurt anything. He's got a new fuel tank vent (if it's the white plastic), it came with the new carb kit. Anyway, new fuel line is in, and he was happy, because, he said, now the saw responds right when he adjusts the carb. Meaning, he can get it to run rich and lean, which he couldn't before. It's still not 100%, though. Because he didn't cut the fuel line just right -- he needs to shorten it next time he gets time. And then he thinks he can finally adjust the carb to be just right. He thinks when that's all done it'll run fine. So he's happy now. I hope he'll make a YouTube video before long, like somebody suggested, because he seemed to like the idea, and I told him it'd be great to really give everyone a listen. THANKS TO ALL! He really appreciates this group.
Winner of father of the year award right here! So nice you both have this to bond over. I’m 28, and I can’t wait to go back to the Uk shortly to bond with my father over saws. Thanks for keeping us updatedUpdate: it was hard for him to attach fuel line back to fuel tank vent (it's the white plastic, right?). He spent more time than he wanted on that. When I finally saw that happening, I suggested the heat gun. Seemed to work real good, I'm guessing it doesn't hurt anything. He's got a new fuel tank vent (if it's the white plastic), it came with the new carb kit. Anyway, new fuel line is in, and he was happy, because, he said, now the saw responds right when he adjusts the carb. Meaning, he can get it to run rich and lean, which he couldn't before. It's still not 100%, though. Because he didn't cut the fuel line just right -- he needs to shorten it next time he gets time. And then he thinks he can finally adjust the carb to be just right. He thinks when that's all done it'll run fine. So he's happy now. I hope he'll make a YouTube video before long, like somebody suggested, because he seemed to like the idea, and I told him it'd be great to really give everyone a listen. THANKS TO ALL! He really appreciates this group.
That is very cool.Thank you. He's a good kid. My Dad was not mechanically inclined at all. But if he had YouTube and Internet forums like this, he woulda done a lot better. Fantastic resources. You guys might not realize -- kid was getting real frustrated about the saw when he got the new carb and it still was dying. Tough when the thing you like the most in the world isn't working. When you're 10. So getting ideas and feeling like "hey maybe I CAN fix this" means tons to him. Tons. It's a bigger kindness than maybe you'd realize. A couple years ago we worked on a riding lawn mower somebody gave us and we'd never got it started up. We made some adjustments. He didn't want to be there when we tried to start it up after. I asked why. He said he didn't want the disappointment if it was a fail. He's gotten better and better at all this. Now we have like 4 castoff riding mowers, 6 push mowers, 3 weed whackers, 3 rototillers and an outboard in our yard. It's cool but can be frustrating -- GREAT to have help.
He’s possibly still a little young to understand what I’m about to say of my experiences when it comes to failures and setbacks, but please do pass it on to him as it may stick.Thank you. He's a good kid. My Dad was not mechanically inclined at all. But if he had YouTube and Internet forums like this, he woulda done a lot better. Fantastic resources. You guys might not realize -- kid was getting real frustrated about the saw when he got the new carb and it still was dying. Tough when the thing you like the most in the world isn't working. When you're 10. So getting ideas and feeling like "hey maybe I CAN fix this" means tons to him. Tons. It's a bigger kindness than maybe you'd realize. A couple years ago we worked on a riding lawn mower somebody gave us and we'd never got it started up. We made some adjustments. He didn't want to be there when we tried to start it up after. I asked why. He said he didn't want the disappointment if it was a fail. He's gotten better and better at all this. Now we have like 4 castoff riding mowers, 6 push mowers, 3 weed whackers, 3 rototillers and an outboard in our yard. It's cool but can be frustrating -- GREAT to have help.
Before he changed the carb, the chain saw would start up, run good for 2 seconds, and then would not rev up at all.
So he replaced the carb, and now it runs good for about 2 and a half minutes, and then it won't rev up and it is dying on him again.
Exactly what I was thinking....check the simple things first. What would allow a saw to run for a minute or so then just die? Well a faulty fuel tank vent would do that as its not letting air into the tank. Wowzers this is a cool kid building saws at that age.Check all simple items first, pinched fuel line, bad fuel line, fuel tank vent, fuel filter new, plugged muffler screen.
The internet made my old tech books almost obsolete, almost! I still have tech books for all of my vehicles and my old 50 horse Merc, pull them out every so often just because they really have the best info! My old Triumph book is so worn out that the pages are falling out, but I still have every page in order!This young fellow reminds me so much of myself learning at an early age about machines, too bad we didn`t have internet back then. My best teacher back then was try something and either success or failure taught one what worked or not, don`t let failure deter you, learn from mistakes and keep trying, success is always one or so steps away. Sites like this one are a great resource for the young budding mechanic, keep up the good work and soon there will be bigger projects to be worked over.
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