I looked at spare parts list at
http://www.husqvarna.com/se/support/
and found this parts lists for older Husqvarna 350 saw
http://cdn.husqvarna.com/ddoc/HUSI/HUSI2004_AAaa/HUSI2004_AAaa_350_2004-03.pdf
I don't know which screws and threads it is about - possibly
those with parts number 503 21 78-27?
Anyway - all Husky engine screws are M-thread I suppose -
and also either M5 x 0,8 (most of them) as well as possibly
a few M6 x 1 - both these are unusually easy to rethread for
"just anyone" because drills required are 5 mm and 6 mm
(instead of fancy fraction of millimeter diameter drills ) to
make them M6 x 1 and M7 x 1, respectively, by means of
the appropriate threading taps (and cooling oil) of course
http://sv.wikipedia.org/wiki/M-gänga
Though you will struggle to find the kind of M7 x 1 bolt you
need - if rethreading M6 to M7 - very unusual thread to my
(admittely very limited) knowledge.
Long ordinary bolts of tiny diameter can be hard to find - for
example if you are looking for 90 mm M5 x 0,8 bolts for your
346xp muffer that is not easily found (except as expensive or-
der from Husky at 3,5 EUR a piece or so), but it is easy to ma-
ke them yourself from 1 meter threaded rods - like this
Many engine bolts (for example cylinder base etc) are hex bolts
that cannot be substituted for ordinary bolts because there is not
space enough for socket wrenches etc - and long hex bolts you
cannot make yourself that easy (to my knowledge) - and long
hex bolts of tiny diameter are even harder to find ... .
But as long as the needed hex-bolt is M5 or M6 and not overly
long you find it e.g., at Biltema
http://www.biltema.fi/sv-fi/Varuhus/
http://www.biltema.fi/sv-fi/Bygg/Fa...t/Rostfritt-stal-A2/Insexskruv-rostfri-19019/
better buy A2 or A4 stainless steel ones (stronger), if avaialble
- a too long one can be shopped to right length of course ... .
If threads are bad your screws are most likely also bad and sho-
uld be replaced anyway ... or at least inspected very carefully be-
fore reused ... .
If you take a look at page 49 of the Husqvarna 346xp workshop
manual I attached earlier in this long thread you can read about
another method of thread repair Hva recommends - by means of
thread inserts - for that you need 6,1 mm and 7,1 mm drills (to
create new repaired M5 and M6 threads, respectively), which most
people don't have
- guess one could use 6 mm and 7 mm instead
and file even so slightly afterwards - anyway - for this you have to
"overdrill" the damaged hole even more than when rethreading, so
to me it seems wiser to start with a rethreading attempt, as that lea-
ves a second chance to use the method Husqvarna suggests if fai-
lute at first attempt ... . But I suppose the mechanics (I suppose they
are) we have communicated with here earlier have done this oftenly
and might have additional advice based on experience ... .
There are also other ways of repairing threads, by the way - like this
http://www.biltema.fi/sv-fi/Bil---M...utrustning/Ovrigt/Gangreparationssats-191373/
Sorry for all the words
... . And good luck to you again ... .