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#Post#: 68159--------------------------------------------------
top rpm, no load
DIR By: jcsmith
Date: January 14, 2016, 12:31 pm
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Does anyone know what the top rpm, no load is for my Craftsman
358.360280 , 42cc/18" bar. It is identical to a PP262 , or a
2375 LE Type 2, Wild Thang. Up to now I've been tuning the carb
by ear, but I'm looking for a wireless tach to do it right.
Also can anyone recommend an affordable wireless tach?
Speaking of a Wild Thang what does the LE mean?
Appreciate any info.
Chris
#Post#: 68161--------------------------------------------------
Re: top rpm, no load
DIR By: Gatekeeper
Date: January 14, 2016, 12:55 pm
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I use the tiny tach or tech tach. I don't remember which one
now. It's around $80. I have no clue on the rpm.
#Post#: 68162--------------------------------------------------
Re: top rpm, no load
DIR By: 660magnum
Date: January 14, 2016, 1:36 pm
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I tune them by ear very rich to where they four stroke (flutter
sound) then I lean them out to where they transition to two
stroke (Smoother sound). Then I richen them back up to where
they are just beginning to four stroke again.
This is where I've always tuned them to (while free running).
When you get the chain into the tree and it starts cutting, the
four stroking will change into two stroking (smooth pulling).
That's where you make the most safe power and the saw runs as
cool as possible and is lubricated good.
Some of the newest Stratocharged saws do not always change from
four stroking to two stroking so clearly as the older chainsaws.
With these you may need to tune by tach?
#Post#: 68164--------------------------------------------------
Re: top rpm, no load
DIR By: Chainsawrepair
Date: January 14, 2016, 2:02 pm
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Info on comparing the tachs.
HTML http://chainsawrepair.createaforum.com/stickys-of-how-to-basics/chainsaw-tachometer-choices/
#Post#: 68171--------------------------------------------------
Re: top rpm, no load
DIR By: dannyupsolate
Date: January 14, 2016, 2:54 pm
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660 magnums method will ensure a good long life for your
aluminum cylinder. Lean condition is what kills them. You want
aluminum cylinder as rich as possible without 4 cycling in the
wood.
#Post#: 68176--------------------------------------------------
Re: top rpm, no load
DIR By: Chris-PA
Date: January 14, 2016, 6:39 pm
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--- Quote from: jcsmith link ---
> Speaking of a Wild Thang what does the LE mean?
>
--- End Quote ---
I'm afraid it means Low Emissions, which likely translates into
a cat muffler. And depending on the year probably some more
restrictive porting and a slightly larger combustion chamber (I
recently measure the port timing on one of the engines from that
vintage - it was interesting)
The good news is that you can get one of the early 2-piece
mufflers and use it with the heat shield that comes with the cat
muffler. That allows you to cut out a pretty big opening at the
back corner.
#Post#: 68735--------------------------------------------------
Re: top rpm, no load
DIR By: gregh
Date: January 29, 2016, 3:56 pm
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Probably around 12000
Mower Tech small engine repair
Joplin, mo
#Post#: 68760--------------------------------------------------
Re: top rpm, no load
DIR By: 3000 FPS
Date: January 29, 2016, 9:48 pm
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I have a tach and never use it anymore for tuning. I only use
it for comparisons before and after a modification to a saw.
#Post#: 70102--------------------------------------------------
Re: top rpm, no load
DIR By: jcsmith
Date: March 9, 2016, 12:10 pm
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Thanks for all the replies everyone.
Chris
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