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stihl chainsaw exhaust ??

my stihl chainsaw 017 will not start or run when the exhaust is fitted.
It is clean and seems OK, I've even tried fitting it while the engine is running.
it seems to be causing to much back pressure.
any ideas..
thanks in advance
colin, August 2012
If it is the type with a spark arrester change the spark arrester.

T, September 2012