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husqvarna 460 low compression 60psi

Discussion in 'Ask the Experts' started by Willoughby, Aug 3, 2019.

  1. Willoughby

    Willoughby Active OPE Member

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    I picked up a used Husqvarna 460 from a saw shop mechanic, he said it had a new oe piston and needed carb work and a worm gear for oil pump
    got it home checked compression , best it would do is 60psi , so I took it apart to look at the cylinder , found clutch cover melted on inside , no I know what happened to the plastic worm gear. but the piston and cylinder walls look great , I expected to find them scored . I am a retired auto mechanic 40 + years ,but im new to 2 stroke - I dont see why the low compression , unless the hole is egg shaped , I dont have inside mikes that small , I did measure piston its 48.93 mm every thing I read says it should be 47 or 50 mm , I dont mind buying piston and jug but am I missing something here ? any help appreciated
     
  2. Marshy

    Marshy WFO Cutting

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    Does your co.pression tester have a Schrader valve in the tip of the hose that screws into the cylinder? If not then you are getting a false low reading. What kind of compression tester is it?
     
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  3. Willoughby

    Willoughby Active OPE Member

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    all compression testers should have a Schrader valve unless your using it for cyl leakage test, I've been a mechanic since 1980 , the gauge isn't new but its always served me well , I put a aftermarket piston and cyl on it today and it fired right up , haven't measured compression yet , but judging by the way it pulls its gonna be good
     
  4. Marshy

    Marshy WFO Cutting

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    Not all do. It has been the cause of false readings for others in the past.
     
  5. old guy

    old guy Love me some Husqvarna

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    Does yours have a valve at the end of the hose that screws into the sparkplug hole? if not you will get a low reading.
     
  6. Willoughby

    Willoughby Active OPE Member

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    yes that's the critter
     
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  7. Willoughby

    Willoughby Active OPE Member

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    how does it work without some sort of valve to capture the pressure?
     
  8. Willoughby

    Willoughby Active OPE Member

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    thanks for all the help everyone ! much appreciated
     
  9. Willoughby

    Willoughby Active OPE Member

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    new cylinder kit and its fixed
     
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