MR MADST,
Try running the mower without the muffler and if it runs ok just replace the muffler. You would be wasting your time trying to unblock it as you can get a new one for about $10-$15 on ebay.

Regards,

Bruce [Linked Image]


Regards,
[Linked Image]

Bruce


Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.