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  1. #1
    Gold Member Beltzington's Avatar
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    JD 3720

    Default Stihl MS310 Hard Starting

    Gas, Spark, Air - Ops Checked Good

    Saw starts in one or two pulls when it has been sitting on its base. Problem seems to occur when it has been turned on its side to do unimportant things like fill with gas and oil. I'm guessing it is flooding but curious as to why. Also is there a "best" method anyone has figured out to get excess gas from the system? I have tried holding the throttle wide open and cranking without any success after 10-20 pulls. Appreciate any advice as I am using all my energy trying to start the saw instead of cutting trees. TIA!

  2. #2
    Platinum Member
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    PNW - Washington - The Evergreen State
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    2006 Kubota L3400

    Default Re: Stihl MS310 Hard Starting

    mine had a small crack in the pickup line inside the fuel tank, it would start and run for a few seconds then die when throttle was applied.. not saying that is the problem but something you might want to look at..
    cheers,
    bigballer
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  3. #3
    Elite Member newbury's Avatar
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    From Vt, in Va, retiring to MS
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    Kubota's - B7610, M4700

    Default Re: Stihl MS310 Hard Starting

    Does it run well after starting?
    If it's flooded pop the spark plug, give it a couple of pulls, replace plug.
    Try running some Seafoam thru it.
    My rides - '95 Kubota M4700 w/ PEC, LA1001 FEL :'07 B7610, LA352 FEL, Bush Hog SBX 48 box blade, '09 Woods BH70-X w/ 16" bucket and thumb, 3pt pallet forks, Dale Phillips PHD, Jinma 8" chipper, 2 Piranha's, Winco 12KW PTO generator, Howse plow, 5' KK tiller, 5' Big Bee cutter, with a 2002 7.3L Ford F350 CC DRW 4x4 and '07 18' Hudson HSE Deluxe trailer - 5 Ton to haul it all

  4. #4
    Veteran Member Treemonkey1000's Avatar
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    Renton, Washington
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    Kubota L3750

    Default Re: Stihl MS310 Hard Starting

    When is the last time the air filter was taken off and washed and dried and then put back on? Or replaced completely? If it floods that badly next time pull off the air filter and tip it on it's side for a few minutes with fuel in it. See if you notice any fuel coming out of the carb or any where. Like the other response leaky fuel lines or the diaphragm in the carb might be sketchy. Then try starting it with the air filter off so it sucks more clean air instead of through a fuel saturated air filter.. See what that does for you.
    1st Peter 1:6-9

  5. #5
    Platinum Member DieselMonk's Avatar
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    New Holland / T4.75 Powerstar & Boomer 1030, Case 580 SM II

    Default Re: Stihl MS310 Hard Starting

    sounds like it needs a carb kit and spark plug. However I would try running Seafoam throught the air intace a few times until she stalls with throttle applied and then mix some into the gas / oil mix too. I mix always 40:1 and my Stihl 034 had after 15 years: 1 spark plug, 1 carburator kit and 1 bar. That's it. My FS110 gave me problems earlier in the spring (hard starting, not running right idling and at full throttle) and I cured it with Seafoam. Runs like new now.

  6. #6
    Elite Member
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    Mahindra 3016

    Default Re: Stihl MS310 Hard Starting

    Quote Originally Posted by Beltzington View Post
    Gas, Spark, Air - Ops Checked Good

    Saw starts in one or two pulls when it has been sitting on its base. Problem seems to occur when it has been turned on its side to do unimportant things like fill with gas and oil. I'm guessing it is flooding but curious as to why. Also is there a "best" method anyone has figured out to get excess gas from the system? I have tried holding the throttle wide open and cranking without any success after 10-20 pulls. Appreciate any advice as I am using all my energy trying to start the saw instead of cutting trees. TIA!
    If you are in Georgia and usung a chainsaw now, you could be experiencing some type of vapor lock in the fuel line when you go to refuel after a hot work out. It restarts only after the saw has cooled which is usually having a saw upright. If you leave the saw on its side to cool down and it starts after 20 minutes, that will give you clues. Try refilling the saw before it goes empty and use premium gas. Peak inside the fuel tank after the saw has been running for a while and see if you can see the gas "percolating". That will also tell you that the fuel is overheating. It only takes 140* for gas to start boiling and thus create vapors. Your cap may not be venting as it should or it may be just too hot outside to be running a chainsaw on regular gas. Seafoam could help if indeed is vapor lock. As a result of fuel injection in cars, they have made gas with less btu's and vapor lock just is not a problem as it used to be when cars had carburetors. If it is not starting after the carb has run dry and you go to refill it with the saw cool, then you have carb problems of either a bad needle (flooding) or a bad diaphragm ( no gas). Again because of today's fuels they're making.
    Last edited by arrow; 06-23-2012 at 01:34 PM.

  7. #7
    Gold Member Beltzington's Avatar
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    Default Re: Stihl MS310 Hard Starting

    Appreciate all your suggestions. Finally got to working on the chainsaw and my original assumption was incorrect. Saw won't fire period. Took the air filter, exhaust off and verified the spark plug was firing when grounded but even with ether sprayed in the combustion chamber it will not turn-over. No idea how to proceed. Any other suggestions?

  8. #8
    Veteran Member Treemonkey1000's Avatar
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    Kubota L3750

    Default Re: Stihl MS310 Hard Starting

    You may want to pick up a new plug if you haven't already. If you can get your hands on a compression tester and see how much compression it has. I don't know what they should be running. One of the other brainiacs on here can tell you. Those would be the first two things.
    1st Peter 1:6-9

  9. #9
    Super Star Member LD1's Avatar
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    Central Ohio
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    Kubota l3400

    Default Re: Stihl MS310 Hard Starting

    Dont use ether on a 2-stroke and dont use seafoam either.

    If it needs a "jump start" ditch the ether and just put a capfull (bottle cap) of 2-stroke mix in the plug hole.

    As to your problem, is it indeed flooding or is it starving for fuel??? When it wont start after 20 pulls, take the plug out. Is it dry or wet??

    If it has air and gas in the right amount AND spark, that only leaves one thing....compression. Do a comp test as already mentioned. When a saw gets tired, they get finicky and hard to start.
    ".........there is only one way to find out."
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  10. #10
    Elite Member
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    Mahindra 3016

    Default Re: Stihl MS310 Hard Starting

    Quote Originally Posted by Beltzington View Post
    Appreciate all your suggestions. Finally got to working on the chainsaw and my original assumption was incorrect. Saw won't fire period. Took the air filter, exhaust off and verified the spark plug was firing when grounded but even with ether sprayed in the combustion chamber it will not turn-over. No idea how to proceed. Any other suggestions?
    Ok this presents a different problem altogether. Low compression usually does not prevent a saw to start. They run crappy but unless a piston ring is actually broken, it could start with low compression. LD1's question is pertinent. No gas or too much? By any chance are the fuel lines wet? If you've got a good spark and put some gas in the carb and it starts, you know you are getting no gas. Replace all fuel lines.

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