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Chainsaw Repair
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#Post#: 41617--------------------------------------------------
P41 saw spark plug gap
By: Bob Date: June 20, 2014, 11:29 am
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Anyone know what the spark plug gap should be for this saw?
Using Champion plug 885 DJ7Y. Installed new cylinder, rings,
head, flywheel, coil and spark plug it will not start but get
smoke out of the muffler like it wants to start, tried putting
starting fluid in plug hole and carb but will not start any
suggestions.
Thanks
#Post#: 41618--------------------------------------------------
Re: P41 saw spark plug gap
By: Warped5 Date: June 20, 2014, 11:35 am
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IIWM, I'd set it at .025 and run with it.
... but the Acres site shows .030.
#Post#: 41621--------------------------------------------------
Re: P41 saw spark plug gap
By: fossil Date: June 20, 2014, 12:01 pm
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I believe the plug you are using is a tapered seat plug. Your
saw uses a washer type flat seal. You are jamming a tapered seat
into a plug hole not made for it.
Ditch that plug and get a CJ7Y.
See it that helps.
If it doesn't, you may have a timing issue.
#Post#: 41635--------------------------------------------------
Re: P41 saw spark plug gap
By: brokenbudget Date: June 20, 2014, 3:16 pm
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don't use starting fluid.
use properly mixed fuel.
#Post#: 41637--------------------------------------------------
Re: P41 saw spark plug gap
By: 660magnum Date: June 20, 2014, 3:20 pm
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In the model airplane world we change over the BPMR7A gasketed
spark plugs for the tapered seat version BPMR7F because the
tapered seat spark plug is much smaller on the outside. It makes
for a more compact engine. There are no modifications required
except to just change the spark plug.
I bought a new '87 Cavalier and a couple years later, AC no
longer made the gasketed spark plugs and I was forced to use '88
Cavalier tapered seat spark plugs for the rest of the life of
the automobile. This never caused any problem in the aluminum
head.
#Post#: 41643--------------------------------------------------
Re: P41 saw spark plug gap
By: fossil Date: June 20, 2014, 8:38 pm
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Why use the wrong one when you can get the right one?
#Post#: 41646--------------------------------------------------
Re: P41 saw spark plug gap
By: 660magnum Date: June 20, 2014, 10:12 pm
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The NGK BPMR7F has 5/8'' flats instead of 3/4'' flats like on
the NGK BPMR7A. This tapered seat plug is also shorter than the
gasketed BPMR7A.
The Champion RDJ6Y is supposed to be the tapered seat
replacement for the Champion RCJ6Y but you cannot depend on the
external size of them. The external size is not so important
with a rubber boot on a chainsaw but when using a metal shielded
cap for Radio Frequency Interference situations, size becomes
very important.
The shielded cap for the 14mm BPMR7F also fits the smaller 10mm
CMR6H plug that's used in the new 500 series Husqvarnas.
My point remains that the tapered seat plug runs the same as the
gasketed plug as long as they are the same thread diameter,
thread length, heat range, and type. I've swapped them back and
forth and checked with a tach under load in several different
engines.
#Post#: 41653--------------------------------------------------
Re: P41 saw spark plug gap
By: Bob Date: June 21, 2014, 10:29 am
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Thank you, for your help I will get the proper spark plug.
Fossil mentioned a timing issue how would you adjust the timing?
Thanks
#Post#: 41674--------------------------------------------------
Re: P41 saw spark plug gap
By: fossil Date: June 21, 2014, 7:55 pm
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Bob,
The timing is set by the key in the flywheel which I'm guessing
you have in there.
I see you changed your flywheel. If you have the old one make
sure the magnets are in the same location and have the same
spacing on the old one and the new one.
I don't know if any of the flywheels in that series have
different timing but will fit on the crank on your P41.
I would guess that if you are getting smoke out of the muffler
you are getting spark but maybe at the wrong time.
You can change the timing by removing the key and rotating the
flywheel counterclockwise to advance and clockwise to retard.
I don't see a spec for the timing in the repair manual.
When you had it apart did you check the reed valve to make sure
it isn't broken and that it seats well?
The repair manual calls for a plug gap of .030"
let me know if you need a copy of the repair manual for your
saw.
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