Rebuilt STIHL Chainsaw Not Running Well - Straight Gassed 2 Stroke Fixed
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- Опубліковано 3 кві 2024
- A subscriber let a friend use his STIHL 028 AV Super Chainsaw and proceeded to straight gas it. The engine burned up and the saw was done. The friend, trying to make it right, rebuild the chainsaw. It now runs, but has not run right since. The friend had no experience rebuilding engines and the parts used were not OEM. This is a can or worms, but lets take a look and see if it can be fixed.
STIHL 028AV Specs: www.acresinternet.com/cscc.ns...
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#STIHL #Chainsaw #SmallEngineRepair #SmallEngine #DIY #Fixed #Troubleshooting #HowTo
028, 028AV, 2 Stroke, 2-Stroke, AV Super, Carburetor Adjustment, Chainsaw, Compression Test, Engine Speed, Field Test, Fixed, How To, How-To, Ignition Switch Repair, Ignition Switch, Lean, Mityvac, Needle Adjustment, Pressure Test, Rebuilt, Repair, Running Lean, STIHL, Set Engine Speed, Small Engine, Stalling, Straight Gassed, Tachometer, Teardown, Test, Troubleshooting, Tune-Up, Tuneup, Two Stroke, Vacuum Test, Won't Turn Off - Навчання та стиль
Gota love old muscle saws, good vid James! The moral of the story, never lend out tools 😂
Thanks Tom. They are well built saws and a pleasure to work on. Although it running a lot better, still concerned about the lack of power. The Facebook one made the cut in about 8 seconds. Stanley’s in about 14 seconds. Might pull the exhaust and see if there is damage to the new top end given it was run with an air leak. Maybe a part 2?
@@jcondon1 yeah, Stanley’s was too lean at 12k rpm, I’d have gone richer to match the aftermarket piston and cylinders requirements. I agree with you too, after market parts will almost always preform sub par to oem. They never get the port timing, shape and flow like oem do and thus you get reduced performance like you’ve shown. It’s a great comparison you did at the end. Well done 👍 edit: re pulling the muffler, good call, it’s the first thing I do on a 2 stroke :) although compression was fine at just under 150, skirt damage can sometimes reduce the effectiveness of post sealing and when warm, the piston can expand and the transfer on the cylinder from piston can contact one and other and start to cause drag and then strange running symptom when it’s heat soaked, won’t idle, hard to restart :) also, if a saw loses pressure quickly but slowly or not at all on vacuum, it’s most often intake manifold if they’re rubber, commonly, but not always, in the pleats 👍👍
@@VintageEngineRepairs it was lean. Did that on purpose to see if I could close the performance gap. Unfortunately that is all it had. Pulled the exhaust to take a look. Piston and rings looked ok. No scoring, but the skirt seemed to have more wear than I would have expected.
ua-cam.com/video/W9SfRdr75fM/v-deo.html
@@jcondon1 difficult to see the piston skirt in that video, but I think just port timing and materials are a huge contributor here. It’s quite well known that aftermarket just don’t preform like oem.
Quite agree. My other half (bless him) lent tools to other people, only to find that they're buggered up when handed back. He's learnt his lesson the hardway. Most stores sell all sorts of tools, in all price ranges. So why bugger up someone elses equipment when they can buy their own?
Top marks on another good vid James.
Wayne & Nina
👍👍👍👍👍👍😊😊😊😊😊😊❤️❤️
I was recently reminded of why I don't lend out tools, even to someone that is experienced at what they do. When it's not yours (oftentimes) it is not treated the same.
In this case, the person just didn't know that you cannot run straight gas in the saw. But when they go to such great lengths to make it right, you know they are good people!
Well said
I was thinking the same.
Well, maybe. The destroyer used chinese parts instead of OEM. Jury is out on this point. You do have to wonder why/how someone "experienced" is filling the tank with straight gas.
A cousin of mine came to me the other day to give him a wood splitter...and I told him to go get it. When he got to it he noticed it was defective (something I was aware of because that's how it got back to me from the last person who asked for it) .. and he came to me to tell me... I replied that I knew this aspect, and he wonders why I sent him to get it in the first place. ..I told him that if I refused it from the beginning, he probably thought that I didn't want to give it to him ... and I also told him that since I received it defective, I stopped lending tools. He turned his back and left without even greeting 🫡
I had something similar happen when a neighbor borrowed one of my chainsaws. They forgot to fill it with bar and chain oil and burnt up the bar and chain. He made it right and bought a new bar and chain and chain
For a guy who works on generators you sure did a nice easy job on that saw
Wish we had youtube and content like this when i was a kid and trying to get the family's push mower going. Luckly i had a kind elder gentleman that went above and beyound to teach me and keep that mower going. That was 48 years ago, but still remember him and his kind ways.
I just smile watching your video here. Funny that back in 2004 I was about 14 and had a 028 that used to be my grandpa’s and I got it when he passed away. It didn’t run right and I took it to my local stihl dealer and they told me it was terminally damaged. Told me to put it up on a mantle as a memoir of grandpa. Basically charged me 25$ for a estimate and gave it back to me in pieces and a ziploc of screws for the top cover and carb. When I got home I was putting it back together and ended up noticing the intake boot off at cylinder. Not knowing much at the time I put the clamp back on and it ran great. Set me down a career path for sure😊 great video!
I've got my granddad's 028WB. I used it for years to cut firewood. It's been sitting a long time, but I know it'll come right back to life with this kind of attention.
This man does an amazing work explaining and fixing small engine equipment , he works very clean that he can go to church right after doing a repair and you'd never guess what he does 👌
You sir deserve many many more subs'ers !
Thanks
HI James, good video. The friend did try to make things right, that counts for a lot. I lent one of my saws to my neighbor and it never ran again, he fried the mag. he never made good on it.
I don't lend anything to anyone anymore.
Rich
I made a rule years ago, I never loan my record albums or my tools, my wife yeah but not my tools.😂
I do appreciate he tried to make it right, but he should have just paid stihl to rebuild the engine and it would’ve been fine.
I'm a technician for factory owned branch of the BIG EVIL tool company and I have taken away more knowledge and skills from watching your videos than 15 years of working for this company. THANK YOU!
Surgery day for me, wish me luck 😊can’t wait to get back to work
Wish you a speedy recovery.
Good luck my friend!
Hope it's not too serious. Best of luck!
Best of luck to you.
Good luck.
_"I hope this video helped someone."_ I'm confident it did with many re: mechanical repairs-but in my case it did/does for another reason. Because my "chainsaw use" and subsequent "repair days" are behind, your videos simply make for a more enjoyable day. Thanks James-God bless.
James, your expertise is above many of us DYI'ers.
Checking vacuum and pressure is something that I would have not known.
Keep posting.
Tks.
James, you deserve a high paying show on discovery or something. Excellent narration, logical, no music (so nice!). You are a great teacher, not to mention your mech/tech skills! Thanks you very much!!
7:00 As an aside, if the engine has unknown history when doing that first start, I’d recommend running it for 5-10 minutes first, to let the diaphragms flex a bit in case they were stiff from sitting. If you adjust the carb before that, you’ll end up having to go back and correct again after the diaphragms become flexible. This may lead to confusion on what’s happening.
I want the saw to 4 stroke when it's free but run clean when it's in the cut. Yea, you have to give the saw a few hard cut before you touch the mixture screws
The snap ring was a diabolical invention!
True, but sometimes a necessary evil. I have fewer problems with the ones that are squeezed together to remove and install. The ones that spread apart can be a little contrary.
That was a great video, James. Lovely of you to help Stanley out, I know he's been a good contributor to your channel. Thanks for sharing this with us.
According to the manual one should do the vac test before the pressure. To do with pulling the seal lips in.
Stanley’s carb needs cleaned. Can’t get enough fuel under load. Guessing high speed circuit has varnish.
You never loan out anything you aren't willing to risk losing.You never loan out anything which requires brains to use correctly. You never loan out anything which has easy-to-reach adjustments someone can screw with. If someone regularly needs something they will have it. If someone needs something because they didn't have the foresight to see the need ahead of time beware their intelligence level. Borrowers usually lack the experience needed to use something correctly so whatever you loan them must be as stupid-proof as possible. Never a borrower or a lender be.
I had an old Stihl 058AV and it was a real workhorse. So powerful so as to be almost dangerous. Having moved and no longer needing it, I gave it to a friend who used it in partial trade for some tree-work she needed done. The arborist was happy to get it and gave her a good discount for it. They sure don't make them like that anymore.
Do you mean a 056 AV or 038 AV Stihl never made a 058 AV. I have a 056 Magnum II that's an animal slow but it cuts through anything . Can't bog it down . I lent it to a friend and gave him a brand new jug of bar oil . When he gave it back the bar was and chain were shot and the jug was unopened. I asked didn't you use the bar oil ? He said it was to messy . Now like you say I don't lend out anything to anyone. Every time I did I got screwed.🍻
@@Spitter-ud8jd Memory fails me as that was around 30 years ago but it was a big one, and there was no bogging it down. The bar was at least 24", probably longer. Never used anything like it before or since, but I don't often use a chainsaw and don't know a lot about them.
Super lovely as always, James, thank-you. Most enjoyable!
And my/our thanks to Stanley and his friend also.
I've been waiting for 2 years to eventually find that "AHA!" moment for my weedwhacker. I believe this is the issue with it. Thanks again! Even though I have more time and money into parts than I would into a new weedwhacker... I just can't let go. I gave up on a lawnmower a few years ago and I regretted it 1 week after I did so when I watched a video, likely one of yours, where someone had hit a rock and twisted the plastic cam gear.
Awesome troubleshooting and fix James 😊
Excellent troubleshooting video. You explain things very well. Thanks a bunch.
Thanks for sharing James.
You have the patience of a saint, watching you fix that I was wondering how many 4 letter words or how many times the tools would have went across the shop... Good on you James
Great video James. LOTS of useful tip and tricks to diagnose issues and how to fix them.
Another quality production 👍 keep them coming. Thank you.
Absolutely great video filled with great tips on troubleshooting. I look forward to every Thursday! Keep them coming.
Great video Jim, nice job on getting both saws up and running
I'm picking up a lot of 2 stroke diagnostic info from you with this video. Nice work & I like your mini torch for soldering things like this!
Great job James on both saws.
I have more confidence after watching your videos, you'r so logical & I understand everything your doing. thank you James!
Great to see you working on chainsaws for a change of pace
Any Stihl Saw 026 AV or like this one 028 is a great buy!!!
Those days they was Way better than todays Stihl chainsaws💯
Running perfect 20-30 years no problem! After Many years the membrane in the carb gets petrified… Mostly only issue🤷🏼♂️
Impressive, I always learn from your sharing of knowledge. Thanks for sharing.
Great video. I recently watched another video where the chain oil flow was restricted even with the max oiling pump setting. The problem was a factory defect on an OEM vacuum relief check valve on the oil tank. The chain and bar ran hot even with a small oil flow on the test until it was replaced.
I had a small problem with oiling on my old Stihl 041AV some years back. After cleaning it good still not enough oil. I put a little kerosene in the bar oil to dilute it a little and that worked to get the oiler working good again. In case some folks don't know if their chainsaw chain is being oiled properly, simply start the saw, run it at full speed and hold the tip of bar above some newspaper or cardboard and you should see spattering of oil on the paper....then you know chain is lubed properly.
Thanks a lot for a very comprehensive instructional video!
Thanks for another video. Great work James❤❤.
Superb, very informative, on spot and still very entertaining video. Five star!
We can always learn a lot from your videos, thank you for sharing!
James found so many loose nuts on that rebuilt saw. I'd have concerns the rod cap bolts and head bolts weren't torqued. Nice repair.
Thankfully most 2 stroke engines do not have a rod cap.
@@jcondon1 I learned something today. I haven't worked on chainsaws. Thanks
Cannot thank you enough for all the videos, James! Gave me the knowledge to replace the carb (and many other maintenance parts) on the very first chainsaw I ever bought. Had the exact same issue when throttling up and ordered a $14 clone carb kit. Extra useful was the detail on tuning it. A few adjustments like you showed and runs better than ever!!! Thanks!
My father has the same model, 028 Super AV. He uses it every year for firewood cutting. Since the eighties, he used it with Stihl mineral oil(red HP) with around 1:25. No problem with his saw.
Another great video going to pressure test my brother's saw.
Thanks
The saws are my main machine, so that was a great ep. Thanks James
Great video on how to check for crankcase leaks!
Excellent troubleshooting and instructional video! I've been a Stihl tech for a few years and not run into this problem before so this is good training for me! Well done Jim!
What an amazing video, thanks James!
I wanted to thank you for your repair videos. I recently got my 50cc Poulan chainsaw running that has been sitting for 8 years. I ordered a clone carb kit with fuel lines. Glad I did because during disassembly I found the fuel lines had cracks half way across the line near where they attached to the carb. So I am sure my old carb is probably ok but it fired right up with the new lines and clone carb. God Bless.
Sometimes there is nothing better than a good carb cleaning....
Sometimes a new spark plug makes a big difference. But yeah, vacuum is very important also. Been working on these most of my life. Still watching, haven't seen the entire fix on the second one yet.
Odd a guy has the know-how to rebuild the top end but straight gasses a chainsaw, must be more to the story I'm sure! Anyways that was a good 2-stroke carb tuning vid and troubleshooting with the pressure tester. Now he has 2 good saws, well done.
Putting it together is one thing, knowing how to tune it is completely another skill set!
I was expecting every seal to have a leak. Not too bad for the guys first rebuild. I was told he had the cases split, but am thinking he may have just changed the jug and piston which is why he had trouble with the boot.
@@jcondon1 He did good for the first one for sure!
Nice one Jim, and it only took one cup of tea to get through it! This video reminds me, I have 5 saws to work on!
Keep in mind: when you loan a tool you are giving it away, you only have a promise it will return the same, if at all; and a promise is a comfort to a fool.
This video did, in fact, help someone.
Thanks for making it!
Whenever you're turning the chain with your fingers always turn the chain in the normal direction of travel, that way you'll be less likely to cut your finger tips off if the chain binds up
2 4 1? You are so awesome to watch. Thank you!!
wow, awesome video, having never had a vacuum leak in any chainsaw I've owned, I just learned something new to add to my arsenal of knowledge
Chainsaws are high performance and like anything high performance
can be a little tricky to tune, nicely done James
Hello James: As usual a top notch instructional video. You are getting a very good inventory of test equipment. Plus in this video new Snap Ring Pliers. This video demonstrates exacrly why many small engine shops do not work on 2 cycle engines unless it is warranty work. It is just too time intensive to make a ptofit on. Kudos to you for showing in detail to the DIY capable of repairing their unserviceable but repairable equipment. Here are 2 more saved from the land fill to work again.
First chainsaw(s) in a while. Great diagnostics as ever.
028 Super is my favorite firewood saw for the PNW, have 2. Great video!
I rebuilt a saw top end a couple years ago. I believe it has this exact same issue. Meaning the crankcase leak. I had it running, but it was doing the cut out thing too. I put it on the shelf. Now I want to get back at it and try what I saw in this video. I love learning things :D
Great watching you working around your problems, James! Very relaxing. Good camera. Good dialogue. Fine editing! I was a commercial tv broadcast technician, so I can verify you do an excellent job! Keep it coming! Watching from Hawai’i…Aloha 🫎
Hi James if i removed all the screws , I would forget how to put it back togather i would have to throw it out and buy a new unit HA .
He has it all on video, so he doesn't have to worry about that. God bless you!
Very nice and informative video! Job well done 👍
Another great video James. I always learn something new when watching your videos and you make them very interesting.
With that tile plow you how and the farmers around there you'll be busy for first part of spring. Thanks for the video
Just brilliant as always James i am learning all the time thanks for sharing 🦘
Great video. I have a chainsaw that is not starting so might have a go at checking a few things on it. Awesome as always James. Thanks.
those are worth to fix , these are very good professional chain saws ,
Nice job finding the air leak. That vacuum tool, a bit of rubber and your skill put it right.... I am fascinated with the RPM meter tool.
Excellent video Doc., learned alot.
Well done James. That seal leak was epic! I agree...I have no idea how that saw was running at all much less only exhibiting an annoying tendency to stall after idling.
Unbelievable work & presentation bud....Darn good job!
Thanks
Great Episode! Great troubleshooting! One thing though: top speed. I believe that you adjusted the high speed as high as it would go. Several other 2-cycle specialists, Chicanic (who sees hundreds of 2-cycles in her shop every year) has emphasized repeatedly that setting it to as high as it goes runs the risk of burning up the motor. She suggests finding the high spot and backing out the needle to take off (I don't remember her recommended number, it may vary by type of equipment) a small amount, something on the order of a few hundred rpm. That slight extra rich mixture is intended to improve the lubrication and reduce wear and heat. FWIW. Could be that weekend users may never see the difference. She deals with a lot of pros who use their equipment heavily. Anyway, you, once again, have probably saved a few thousand pounds of stuff from being dumped in landfills with a single video.
you are the real boss! great job as usual.
Reminds me of when i got my Stihl 025 last year. Put a new carburetor, fuel line and impulse line and 4 pulls later it fired up. Still runs great just waiting for my new skip tooth chain to come in. Had to use it Tuesday after a tornado came through southern Ohio early Tuesday morning
Same storm came through southern Indiana. I’ve been busy cutting up trees. As of today, I’ve been without grid power for 4 days. I’ve been running the generator for that time and gas ain’t cheap.
Should do the vacuum test first. Doing the pressure test first could push oil into the seals giving a false reading when you do the vacuum test
These vintage STIHL chainsaws were pure serviceable units compared to the new STIHL saws. The 028 AVs were definitely the best vintage chainsaws ever made. And I sure as hell miss these good old mcculloch days
Great video James
I love those things, but never get a chance to use them. Have done in the past and enjoyed myself. Thanks :)
Hello James, I've been binge watching your videos for a while and subscribed, love your channel👍 I cut a maple down last Saturday with my Stihl MS250, bought it new in 2018, best chainsaw I ever owned. You can't beat a Stihl for high RPM and fast cutting. Take care my friend, just a Canadian Guy from Eastern Ontario.
Good timing James! I was out with my 034 the other day, and it started idling funny and then it bogged. I brought it back to the garage, drained the fuel and bar oil. The impulse and fuel lines were replaced a few years ago with OE. I’ll be checking the filter, lines, boot, and crank seals. In that order.
Interesting end result. 😮😊
AT 56:00 I said out loud "oh, he needs to have a piece of heat shrink tubing already on that wire" and you did.
Nice work indeed.
Enjoying your videos, JC. Thanks for educating us…😀
Great video James!
I learned a lot from, and feel really impressed with this video. Thank you for posting it. I think the younger generations in my family lines can make excellent use of and learn many things from your videos. As many others say in the comments....your diagnostic skills are superb.
Thanks
@James: I commend you on your patience with these chainsaws and 2 cycle engines in general. I’m very comfortable around 4 cycle but 2 cycle is always a challenge. Everything is so compact, assembly order is crucial. When I watch vids on equipment like this, I try to imagine the factory assembly process. Great video. Thanks.
Same here. I do not do a lot of 2 stroke. Always a challenge mostly due to the size.
I own a small engine shop that specializes in 2 stroke equipment, mainly Stihl. I haven't worked on an old 028 in a long time. Those things sure were built well. You did a great job on that repair!
Thanks
Master! Great work
DR James does it again😊
And remember the one saw rings haven’t set in yet it needs to be put to work . Great job with both saws .
I hope that is it. I pulled the exhaust tonight to make sure the piston and cylinder were good. Was concerned that the intake boot being the way it was may have caused damage, but things look good.
Nothing to say other than unbelievably well done as always and if comments help your algorithm I'm here!!!
I regularly retuned my father-in-law's saws for him. One day he asked me to fix one. It was in little pieces! He had it in the tractor bucket and was coming back up out of the trees and running his brush hog as he came up the trail. The saw got flipped out of the bucket and the brush hog chewed it up! We all got a nice laugh out of that, then he went and out and bought new saw!
Great work again. I would have pressure/vacuum tested the fuel system too. Perhaps the old screw radiator hose clamp of the intake boot could be upgraded to the new spring type. These type will never leak. Ok the guy who took it previously apart did not tighten it but anyway screwclamps always loosen up with heatcycles. On the "slow" saw I missed the fourstroking" at full throthle when tuning, so possibly could have opened up de H more(lower speed but more pull)
The H setting I maxed out the speed. Not good for the saw, but was trying to see if I could get it to cut as fast as the Facebook saw.
@@jcondon1 ok, good to see the performance difference between aftermarket and OEM. Maybe it improves when the piston and rings are more seated in? Regarding the comment on pressure testing the fuel system. UA-cam channel "Married with small engines" does it standard and I think that's really good. Sometimes tanks vents are not fully ok anymore and together with a clogged fuel filter or a tiny crack in the fuel line causes misdiagnoses on for example the carburetor. Still great work and keep it up. Especially the consistency of diagnosing is of a very high level🤩.
Anytime I’ve lent out my machines, I include the mixed fuel so they don’t have to mix anything, they just use what I’ve provided. No blown up equipment so far. They also have to own some 2 stroke stuff in order for me to trust them with the machines.
I've read all the comments. If you loan a saw you must send mixed gas and bar oil that the machine is used to. Very important to take stupidity partway out of the equation
I think it was. Unfortunately he ran the saw dry and refilled it with the wrong stuff.
I've had a Stihl 024 AV since 1985. Out of all the tools I own, that one alone is the most dependable and reliable. Even after 39 years, it's my go-to saw and starts and performs every time I need it. With regard to the air filter at 1:05:10 - while there are better filter designs now, that clone is a faithful copy of what Stihl used. My 024 came with that plain screen filter from the factory and I ran it for many years.
Ditto my 025 from 1994...and I am still using it ...but I clean that filter and the saw after every day of use.
James, You forgot to check the fuel tank vent....
If concerned about oil on bar and chain, and at every sharpening, clean the bar channel and bar's oil inlet hole.