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Problem with blower

Hi I have a stihl blower bg86c which has started to become really hard to pull.

Sometimes you pull it and it's fine and other times it completely jams solid.i have switched over the pull mech from a spare machine and it still has the same problem so I know it's not the that.

The flywheel looks ok ...a small amount of wear but all intact.........any ideas what it could be?


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  • There's some screws under the flywheel that hold the crankcases together............ these can sometimes work loose and lock the engine though I would have thought it would stay locked and not free off. Might be worth removing the flywheel to check on those screws though.

    • Ok cheers I will have a look

      • So took off the flywheel but all the screws were in place ... ...anyone with any other ideas?

  • PRO

    Soundsl ike a possible broken piston ring or collapsed main bearing to me. If its the rings, it will need a piston and barrel and new rings at best.

    Another option is that it is partially seized and is occasionally 'picking up'.

    Remove exhaust and check piston and barrel for scoring (if your mechanical abilities cover this).

  • check the magneto has the propper clearance on the magnets of the flywheel 

    • Any idea what the clearance should be?

      Had a look online but couldn't see anything

      • do not know the propper clearance but its very small when you took off the pull start did you take the plug out and rotate the fly wheel by hand to see if you could detect what was jamming the rotation 

        • Yeah had a look ...everything seems to run freely......

          I think I am going to put it on the back burner till winter.....

          All I can say is I am baffled

  • I Think I might give up with this blower as I can't find anything wrong with it unless the teeth on the flywheel have worn but it doesn't look like it has excessive wear.

    I have another blower I can use ,it's the same model but it is the quieter version bg66c.

    It's seems to lack some power ....does anyone know how they make them quieter ?

    I just thinking that I could swap the parts from one blower to another and make one decent one

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