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I had the same problem with my HS720 where it was surging at idle. The machine was running lean and the idle would smooth out if I pulled the choke partially out. I initially wanted to richen the fuel mixture by adjusting the mixture screw but I came across your video on cleaning the main pickup out. It worked like a charm and the engine is purring like a kitten! I didn't have a file or anything small enough to get into the hole so I shot a VERY SLIGHT amount of compressed air down the access port after soaking it with carb cleaner for a while. Thanks a million for your video!

I could not push the filter out, I drilled it and install external check valve on short tubing. I also had the ignition coil which worked only when engine was cold after running for few minutes, I could not restart it and had no spark

Um … lending it to yer neighbour … there’s yer problem! I have had employees use mine it it’s like lending out yer girlfriend ….

Greetings from Germany. Same issues here. I found a Video where someone told he used a Screw to pull out the plug an then put in a new one in the hole. But what a bug to place the vent at the bottom of the chassis.

This video is the best 👌

I got the same engine same year with the flat gasket and mine's pouring out of the corner

Yes same leak and same gasket here. I did find some covers had gasket maker added, perhaps as a fix at the factory but it makes removing the cover impossible.

OMG, I had a bad gasket, but didn't know about the plastic insert. Mine was all the way out. Tapped in and hunting is gone. Thank you so much.

Excellent video, great info. Thank you.

What is the vlve cover gasket number?

So what gasket did you use? What is the ordering information?

Does the primer bulb work properly?

My problem exactly. Thank you sir for making this video. I hope it helps me. I'm ordering the gasket today.

The problem with the Husqvarna 235 has nothing to do with the fuel tank vent, and has everything to do with the carburetor. Fuel bulb is called a purge bulb not a primer bulb. Purge bulb has only one use, it supposed to purge the air bubbles out of the carburetor and fuel lines. A primer bulb is used on lawnmowers, and pumps fuel directly int the venturi. If fuel is puddling up under the carburetor from pumping the purge bulb the carburetor has a defective check valve. You should be able to pump a purge bulb all day long and never leak one drop of fuel. Husqvarna would never admit that the zama C1T-W33c carburetor is a defective design and should of been recalled from day one. Actually the tank vent was designed to be under the carburetor for the reason of recycling any unspent fuel back into the fuel tank to meet EPA standards. Now most saws have a fuel line directly from the tank vent either back into the fuel tank or into carburetor air filter box. The best way to remedy the ongoing issues o bogging with the Husqvarna 235 would be to find an aftermarket carburetor and throw that Zama carburetor in the scrap bin where it belongs! I would bet that shortly after this video that the bogging issues surfaced again. I would really like to see an update to this fix to see how long it lasted. I refuse to work the Husqvarna 235 anymore, I always recommend to anyone that wants me to work on a 235 to cut your losses and scrap the saw and not try to sell it to someone and have the same issues.

I was watching a Vid by Donnie Walker, recently, and gave a Part # for a VENTED Gas Cap! #503-82-8005 for the Gray Cap and 8004 for the Green one!!!! But I had already started on trying to remove my Vent! D'OH!!!!! (My 235e doesn't have a Vented cap)

I need help ....I just bought an Husqvarna chainsaw 326 it started when the fellow tested it but the day after only enjoyed for fifteen minute then it become a night mare . (long story short ) I replaced the carburettor ---new one from China --- replaced it but stil didn't start and because it hard to pull the rope i decided to have a look the piston.... it shoes a little scratch on the front --muffler-- has not damaged the ring and the cylinder ...then I tested the ring in the cylinder for any major gap It does have a gup of about one millimetre is that ok or I have to replace the ring and the piston ? Thank you

I think this is my problem too! I’ll keep you posted

My wheel gears wear on the edge was caused by the wheel mounting plate being toed in. This is how I fixed mine without having to replace the wheels. Because just the tip end of the wheel gear was worn it worked after I made the mounting plate parallel. Hope this helps. ua-cam.com/video/RVK_po7BRZs/v-deo.html

Thank you so much for this video out gasket was definitely broke. Saved us such a head ache ❤

This is the most nasty full of issues chainsaw from Husqvarna but I think the most important isue is the carburetor which is made by zamma China if you buy a new one original not aftermarket it will run better a period of time after that it will have the same problem.I think that the big problem is carburator.

What your talking too mutch like a woman has nothing better to do??

Great video!!!, after seeing this I decided to take the top hose off the primer which connects to the tank next to the vent that you perfectly explained, and that solved the issue for me so far, I don't need the primer anyway, the choke is good enough. So I'm using the primer hose now as a vent.

Wtf I would never have figured any of that out thanks

Great video. What a terrible design. I ended up gluing the bolt in so it doesn't slip out. That gasket should have been made of metal or something.

Thank you!!!!!! Rebuilt engine - repaired cracked engine case by head that all these engines have, and it surged. Now this vid is exactly what was wrong....torn gasket, My thanks

Thanks, heard about this vent but never seen any videos on it,my 235 has the same problems so i will have a look at this now i have the carb off😁

Great video, was also having a problem with an SV601 3212. Carb no longer available. Got a chineesium, put on, still surges 😢 So I tried your solution, and was excited when I found a hole in the gasket. Installed new gasket, and... whallah! It DIDN'T help 😢 Tried the hidden screw thing, STILL surged. This mower I'm working on was previously touched by someone that couldn't spell "gas" if you gave him G&A. Things broken, missing, loose, etc. Nightmare. Anyway, I decided to try re setting the governor, and that was what it was. Great video though, appreciate you sharing your experiences, and maybe my experience will help someone eventually

He is referring too To Tayrl Fix's All...This guy Tayrl is AWESOME. And thanks too this video! This guy is AWESOME 😎. I'm fixing my Kohler soon.

I also have 235 chainsaw,but it has problem with sparkplug. When i try to start the engine, the spark will get wet,or oil.how can i fix it.?

Worst video ever, you did not fix anything nor point anyone in the right direction.

Was at my wits end until I watched this video and it was my exact problem! Thank you!

It’s best to have 2/3 extra vents and try to keep saw clean Dry wood and duel chains will stop it up quickly

Great video 😊This is a big problem! I don't know why Husqvarna have not shared information about tank/vent/pressure requirements ??? I have done everything to Mt 562xp auto-tune and it still won't go.... prob wasted money on a new carb as I first thougt that was my prob inspected that vent, cleaned it, broke it, bought and waited for a useless defective clone product. Have endlessly searched for a legit on. Made my own even... but i😊 still have no idea what the f*** I'm doing it still won't turn up properly if I manage to start it

When I throttle up my SV470 engine until that little cutout in the throttle lever where max power would be, my engine surges badly, almost to the point of shutting off. I have to lower the throttle back down about 1/4 inch below that little cutout to keep the engine at full speed, I may have to check on this gasket on mine. Thanks for the video!

Jesus Christ is Lord

Nothing more than the clutch tensioning cable for me and fix👍🏼

One I have will start for like 10 secs then just shut off

I took mine completely apart, and lightly sanded the shaft where it goes in the bushing. A light application of grease, and it worked like new.

The air vent should be in the cap gas tank because the location of that air vent shall accumulate the residue of the fuel oil and the wood powder, then it will be easy to maintain. I have that problem I searched a lot to find the location of that air vent I couldn't find it except with you. (Thanks for sharing) I realised that was the problem because when my chainsaw stopped and when I opened the cap the air was suced in, so in conclusion, it is better when starting to turn it on to not pump a lot of fuel so it will not exceed the carb out and then it will be reabsorbed with the wood powder.

Op can you share the other videos you referenced? I have the exact same sv540 kohler courage which has a slightly different carb and setup than the larger models..which is all im finding videos for

hey great vid hate to say it , i had this same problem, same machine. also did Darrells gasket trick previously (late to the party ) 😂 had the serge , new gasket. 😃done thx👍

I have the same problem

Does anybody have a pic or video of how the linkage rods from carburetor connect to the control levers/mechanism? This would be where the rods connect to controls where throttle cable is connected. Thx

Man its 330 am im still trying to get my Fuel live from the right of the Tank Nd i got everything hooked but having difficulty getting the fuel line that gose fro the tabk yo the Bubble!

Excellent Video My Friend , Darn tank vent.

Thank you!

Man great video. I have one of these saws in my shop. Will try to start, but will not idle. When I pull the trigger, it tries to run but bogs down and stops. I drained fuel, saw that the fuel filter was broken off the end of the fuel line inside the tank, and the fuel line was yellowed and brittle so I ordered the oem from Husqvarna and changed. Checked carb diaphragms and they are still flexible so I put back together and same result. I’m wondering if I have the same issue. The saw will start, but will not idle and will only run if I give gas on the trigger, which sounds like fuel starts to get through but then a vacuum gets created due to blocked vent. I do have one question for you, when you replaced the tank fuel line, where did you get it from? I may have missed it in the video. Thanks again!

Honda didn't listen to ATG. ATG informed Honda this major fault over a decade ago. Now, Honda, like Husqvarna, mowers are in the history books.

That did steer me to the right direction. Awesome thanks

You had a air leak Torn gasket will suck air and surge and can act like a blow torch when sucking gas and it ignites ! And can burn your valves