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Thread: Chainsaw lacking power

  1. 19th October 2013, 12:32 PM #1
    Grappler
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    Chainsaw lacking power

    My trusty chainsaw has suddenly become gutless under load
    So far Ive changed sparkplug, checked for strong spark, replaced air filter, serviced carb, pulled and cleaned the spark arrestor/muffler, checked pickup and pulse tubes for leaks. The choke is operating correctly. Fuel is fresh and the fuel filter is clear

    The motor seems to be running lean as it starts and idles fine, but fails under load. No amount of tuning will get it running sweet. What am I missing?
    A crank case leak perhaps?

    May be time to get a new one!
    Last edited by Grappler; 19th October 2013 at 12:34 PM. Reason: additional info
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  2. 19th October 2013, 01:19 PM #2
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    isuzurover
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    Brand and Model?

    Lean would be MORE power, not less. My husky had heaps more power right before it seized from an air leak...

    Is it bogging down or is the clutch or bearing on the way out?
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  3. 19th October 2013, 01:53 PM #3
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    87County
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    Sounds like it's possibly the fast run jet blocking ?

    Look at cleaning the carburettor renewing the diaphragm(s)
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  4. 19th October 2013, 03:19 PM #4
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    omnibus
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    air leak between carb and block, maybe?
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  5. 19th October 2013, 03:27 PM #5
    BathurstTom
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    Quote Originally Posted by 87County View Post
    Sounds like it's possibly the fast run jet blocking ?

    Look at cleaning the carburettor renewing the diaphragm(s)
    +1

    Tom.
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  6. 19th October 2013, 03:47 PM #6
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    Rohan
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    Possibly a silly question, but are you running it with the bar removed? Often a damaged bar/chain or the kick-back brake could be the cause..... (I like to try the simple stuff first).
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  7. 19th October 2013, 04:12 PM #7
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    rijidij
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    If you remove the carb and exhaust, check through the ports to see if there are any score marks visible on the piston. If it's had a small nip it might still run, but could loose compression.

    Cheers, Murray
    '88 County Isuzu 4Bd1 Turbo Intercooled, '96 Defender 130 CC VNT
    '85 Isuzu 120 Trayback, '72 SIIA SWB Diesel Soft Top
    '56 SI Ute Cab

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  8. 19th October 2013, 04:24 PM #8
    Davehoos Guest
    after checking fuel supply and exhaust,good idea to keep a carby or a kit available--as you never need it if you have one..the current fuel eats the system.

    then look at bolts in the casing.
    lot of the chainsaw have bolts coming under into the barrel that fall out.

    lot of the saw at work have pressurised fuel tank like little mowers do.
    they have a pressure check valve to hold a set pressure.
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  9. 19th October 2013, 06:53 PM #9
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    Bess
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    Chainsaw

    G day, try checking the fuel line for a very small break. Fairly common causing fuel starve issues on some makes. Can be hard to spot if you don't remove the line. Good luck.
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  10. 19th October 2013, 08:51 PM #10
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    DeeJay
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    Most possibilities have been covered, but if it has good compression - if you don't have a compression gauge, try pulling the starter rope until the engine compresses & it should take 2-3 seconds of resistance- then remove the exhaust & check for blocked ( carbonned up) port or exhaust. This happens with a too rich mixture.
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