How To a Fix a Chainsaw that keeps flooding and dying at idle and bogs on throttle acceleration

Restoring the needle and seat contact areas in your carburetor

[patgionest]

THANK YOU SO MUCH FOR SHARING I just recently decided to try and fix an old Jonsered 525 that my Dad had bought new in the 80’s and that got passed down to me. After replacing the piston, ring, crank seals, a new carb kit and many attempts at tuning it, I just couldn’t make it run right. I was just about ready to give up since replacement carbs for these are now impossible to find. After watching this video I went straight in the garage and took the carb out again. Sure enough, the needle wasn’t sealing properly but now it is and the chainsaw runs great and starts back up with only a short pull on the recoil! Once again, THANKS FOR SHARING!!

[timkelley]

Just used this tip to fix a John Deere 544 with Kawasaki Mikuni double barrel carburetor that was continuously flooding. Haven’t able to run it for years and they wanted 400 dollar for a new carburetor for it. THANK

[laughton]

I just used my 2036 Jonsered 2036 brush saw for the first time in 3+ years. I always used premium, non-oxygenated gas in it and measured the 2stk oil carefully. I don't use it as much as I did when I got it 20 years ago. So I didn't have any mixed gas around. I bought a can of pre-mix to try.

The saw started right up - a few primer shots and off it went. But didn't want to run at idle - even after warmed up. I would run at half choke. Today, before I loaded my stuff to go to work I sprayed that little carb with carb/choke cleaner - I just hosed it down. After it dried I started it again and sprayed the running carb again. That blast killed that little engine. But it did run at idle.

So I went to work and it ran flawlessly. I did bog a little at throttle up. But it always did that. Best to keep such a small engine revved up a little anyway. Next spring I may adjust the carb a little.

My point is to try the simple things first. WHAT THE FIX did a great job of fixing his saw. I'm sure he's an excellent small engine guy. But don't start tearing things apart until you try the easy things first.

For example - the on/off switch. My saw started so good yesterday. Today I couldn't get it running - until I turned the switch to 'on'. LOL

Another thing to check when hard starting or poor idle. Make sure you air cleaner is not full of sawdust or dirt. I'm no small engine guru - but I've run many hundreds of gallons of gas thru 90cc chain saws. Not tree trimming or logging - cut, trim, wait for removal. We cut on powerline construction projects. Cut, limb, move on. in those bigger saws we'd go thru 2.5 gallons of gas per day per man.

[simonsackett]

I'd just about given up trying to get my saw running properly. This is the last thing I'm going to try before it goes in the bin!
Edit: IT WORKED!! The needle looked as clean as new but I ran a drill bit in the hole by hand anyway, then blew it all out with the air line - fired up straight away and after adjusting the idle when it had warmed up it now starts and runs really well. Thank you!

[danielazbill]

Simple straight to the point... Effective. To you sir, from head to hand my hat.

[Norwaywildlife]

Worth trying ! Thx for konsis and sharp on the spot demonstration and not all kind of fuzz around ! :-)

[ryanlindsay]

Had a feeling this was my problem. Thanks

[bjacker]

The vacuum test is a good tip though! You could prolly use a spare primer bulb

[terrykrall]

Actually.... you guys yelling at each other about laundry is calming....

[healthyveggy]

Thanks for the great lesson on needle and seat. My question now is I just replace the primer bulb, connected the hoses as they were and it continues to flood.?? Yes i did swap the hoses, and no success??

[chriswrobel]

Gonna give this a try, got a stubborn poulan 42cc, started bogging real bad cutting out. After it cuts out you can tell it's flooding with fuel coming out the muffler from trying to restart.

[steakhouse]

Question im working on a 345 Husqvarna and i rebuilt it to a 353 and i can't get the carburetor adjusted and the screws seem to not be doing nothing with high and low but it idle good

[ncraig]

Run your bit in reverse by hand or use a small bit and steel wool shoved down the hole, the bit will catch and spin the steel wool, again, by hand

[gdsstudio]

How about running the drill bit backward? Would have a lapping affect instead of chipping out metal.

[benthechainsawsculptor]

Hey buddy, I know it’s late in comment section, but thought I would ask.
Mine bogs down after it gets hot.
New spark plug, new coil, carb rebuild… nothing changed. Could this be the problem? Thanks

[johnclarke]

When I have a saw that is going into compressor stahl I lean out the L jet until it stays idling. My time frame for my saws is 15 minutes. Compressor stahl means it is getting to much gas and overwhelming the saw. I check my carbs to 5# pressure with my Mighty Vac before I put them on a saw. If they do not hold 5# pressure they won’t work properly. I went through four aftermarket HD carbs for my MS 440 before I got one that worked properly. I do squirt a little gas in the carb before I test it with the Mighty Vac. I want the needle wet before testing.

[Rein_Ciarfella]

Good idea, I guess. Most recommend polishing the seat with q-tip in drill with toothpaste or other mild polishing compound. I will try your method to see how it works.

[briansuchoski]

I performed the task that you showed. Thank you. I'm not sure about one task. The drilling task? There's the hole (seat, i guess), and there's a smaller hole at the bottom of the hole. Which hole is supposed to be the target of the drill bit? I assumed you meant the larger hole?

[tonyd]

My Stihl 034 AV when started and I try to tune up got trouble with the n "H" it starts to get power when the screw is all the way in
which is NO GOOD ---it suppose to be 1 turn out--- also a lot of black smoke come out (it has a Tillson carburettor )
Can anyone help if it can be fixed ??

[bobeden]

when I press the primer bulb I see air bubbles in the fuel lines, is this showing me I have a leak in the fuel pipework?