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#Post#: 79426--------------------------------------------------
Stihl 066 redlight info stihl 066 660
By: Chainsawrepair Date: October 27, 2017, 8:00 pm
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Just saving info I reposted 10 years ago.
This is all 2nd hand info from reading. The redlight saws were
rev limited to 12.5k and the little led red light would come on.
This first part is more info on Willards 066 RL.
(((066 Mag Artic red light, with dp muffler serial # is
126316881. This "ARTIC" has the thermostatically controlled
heated carb and no heated handles. I didn't bother getting the
bulky wrap handle. The heated carb still heats perfectly today.
I bought this saw brand new in the summer of 1992 so I presume
its a 1991 model. I did upgrade it about 6mths after I bought it
with the newer flywheel and module.
18 years later and a few thousand hrs on it, it still has lots
of compression, I never had the cylinder off of it. Only 2nd to
my 090AV, my 066 is the toughest saw I ever owned, never broke a
crank, bearing, etc.
Willard.)))))
Again all 2nd hand info. So take it for what it is worth. This
is just stuff I have heard since I dug up info after getting
mine. Even though mine was updated I wanted to know too .
((((The red light 066 was only made for a short period of time.
They were only made on a very early flat top 066; there was no
later model 066 using them. There was an RPM rev limiter in the
coil and an LED lead running from the coil to an LED light at
the side of the saw. The light lit up when the rev limit was
reached and the coil was cutting out. This was so that you could
tune the carb H screw to lean it out just until it was cutting
out, and the LED light was flashing. For that reason these saws
had engines that were fairly bullet-proof; it was nearly
impossible to score the engine with the limiter in them. Only
straight gassing did them in. Or the bearings went out, as was
the case with mine. The swapped out red light and later models
of 066 with the AL flywheel and unlimited coil had a common
problem with spinning the flywheel side of the crankshaft off
because of over revving. So Stihl made the flywheel side of the
crank thicker in 1996 and replaced the aluminum with a poly
flywheel. They also changed the ignition modules to to advance
the timing at high revs on the later poly coils. The AL flywheel
coils are straight-line timed ignitions; they do not have an
advance curve in them like the poly modules do. The CDIC coils
also had a timing retard in them at low speed for easier
starting.
In the above post, the 1303 module was in the 064, and not the
066. The red light 066 coil module was a Prufrex CDIC, Stihl PN:
1122 400 1307 (similar to the 064 module, but it has the LED
lead). It was changed to an Iida unlimited coil module, Stihl
PN: 0000 400 1300, in 1993 and retained the AL flywheel. That
was changed to an Iida unlimited coil module, Stihl PN: 1122 400
1311, in 1994. The 0000 400 1300 coil is a generic coil and is
still used in some of the new larger Stihl saws. The 064 also
had a CDIC coil put in them from 1989, but there was no red
light limiter LED. Note that only the 064 AL flywheels have two
key slots. This is to accommodate different types of ignition;
one was for electronic ignition, and the other was for analog
points and condenser ignitions. On these flywheels, B stands for
Bosch (old points) and P stands for Prufrex (new electronic).
Quick history of the 066:
Early models from early '91 to late '92 had the 'red light' LED
and limiter coil with AL flywheel.
Loggers figured out the limiter and swapped in the non-limiter
coil. Stihl figured out what was being done and came out with
the non-limted coil model.
Original red light saws with limiters were bullet proof and
immune from air leaks and lean scoring as well as flywheel sheer
(both good).
Problem with the limiter coils fading in time and rev limits
lowering to near 10k from the original 12.5k (bad).
Later-early model 066 from late '92 to early '96 had the
non-limiter coil with the AL flywheel. The LED was removed (a
weird gimmick at best).
Problem with this saw was that if they were revved high and sunk
into a wood cut and bogged down, the inertia of the AL flywheel
sheared off
the crankshaft, and self-destructed the flywheel, saw case,
crank, or all of them (not good).
Late model 066 from '96 and on were updated with a beefier crank
and a polymer flywheel which is a lot lighter, and not prone to
sheer from built up inertia. The poly flywheel also had a
different ignition coil that had an advanced ignition curve at
the top end. The decomp button was added at some point, with the
humped top.
The late model 066 was made obsolete with the MS660, but they
remained essentially the same saw.
The 066 came in several models. The MR (Mag Rescue) model had a
3/4 wrap, a PNW sprocket side cover and large falling dogs. The
early M (magnum) model had a dual port muffler. The Arctic model
had a wrap handle heater and a mini alternator in the flywheel
(both AL and poly flywheels have a heated handle/carb version).
There are also Aussie AUS and Canadian CDN versions of the saws.
The Canadian model had a full wrap option. The Australian model
came with a high output oil pump. They had light, medium and
heavy duty air filter options. They came with an Elasto-start as
an option. They also had a variety of carbs, some had a fixed H
jet, some with heaters to keep the carbs from icing up.))))))
More info. From a stihl guy out in the PNW
Early 1994 - Thin cylinder base ( Red light etc) changed to
"thick base". Base screws changed from M6x20 to M6x25
Mid 1994 - Beefed up crank - Crankshaft BIG end changed from 12
to 13 roller pins from serial number 129 588 002. At the same
time, the cylinder base gasket changed to rubber coated Steel
(so quit using the junk aftermarket gaskets!).
Early 1995 - OHSA (NOT EPA) forced the dicontinuation of the
Dual port Magnum muffler from serial number 131 960 509. HP
dropped to 7.2
Mid 1996 - decomp valve fitted on all 066 from serial number 131
960 509
Early 1996 - Poly flywheel installed and crankshaft bearing
increased in size from 13.5 to 15mm from serial number 131 917
066
Early 1998 - shrouds and filter box changed from squared to
"rounded " type. Limiter caps on carbs and EPA labeling...
Early 2002 - Name changed from 066 to MS660.
Lot's of ignition changes and carbs over the years...
#Post#: 83218--------------------------------------------------
Re: Stihl 066 redlight
By: HolmenTree Date: September 10, 2018, 7:53 pm
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I had to bump this great thread.
Here is my 1992 066 Arctic Magnum today in below pics.
No longer a Arctic as I rebuilt this 92cc beast into a 066/early
064 hybrid. She's now a light 14.8 lbs PHO and with a further
possible weight reduction, with a 046 poly flywheel and rewind
spool... will get it down to 14.6 lbs. Same weight of a MS461 or
572XP.
In the last 2 pics is my other 066 to back up the hybrid in my
tree service fleet.
It is a late 1996 model or possibly a early 1997 before EPA made
the changes in 1998 with the introduction of the round top 066.
This HD saw will handle the 28"-36" business end.
#Post#: 83222--------------------------------------------------
Re: Stihl 066 redlight
By: HolmenTree Date: September 11, 2018, 3:07 pm
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Just confirmed with Definitive Dave's info that my above 1996
066 is not a 1996 but is a 1997 model....the last year of the
flat top.
The 1998's were the start of the EPA round top 066's.
Dave says: 1997_ 064/066 after serial#133459523 first plastic
name badge.
Mine has the plastic badge and its serial # is 134989911.
I'm just proud to say I got a keeper here. 8)
#Post#: 83223--------------------------------------------------
Re: Stihl 066 redlight
By: HolmenTree Date: September 11, 2018, 4:01 pm
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To add Dave also said:
Early 1998 after serial#139176186 top covers changed from flat
to rounded.
Certified EPA.
Limiter caps on WJ69 carb.
Different port timing and smaller exhaust openings.
#Post#: 83227--------------------------------------------------
Re: Stihl 066 redlight
By: HolmenTree Date: September 12, 2018, 12:45 pm
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Just made the 066 hybrid 3 ounces lighter and alot more compact
with a narrower profile.
I stuck a Husqvarna 272XP top handle on it, bolted right up.
At the rate I'm going I'll have her in the 13 lb category, Lol
Here's 2 pics. :)
#Post#: 83230--------------------------------------------------
Re: Stihl 066 redlight
By: Chainsawrepair Date: September 12, 2018, 4:18 pm
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[quote author=HolmenTree link=topic=6678.msg83227#msg83227
date=1536774352]
Just made the 066 hybrid 3 ounces lighter and alot more compact
with a narrower profile.
I stuck a Husqvarna 272XP top handle on it, bolted right up with
no modifications.
At the rate I'm going I'll have her in the 13 lb category, Lol
Here's 2 pics. :)
[/quote]
:o 8) go figure I would have never even thought of trying a
husky handle on a stihl or vice versa.
#Post#: 83232--------------------------------------------------
Re: Stihl 066 redlight
By: farmboy Date: September 12, 2018, 9:20 pm
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That's good to know. The carry handle on AM660's are weak.
Will have to see if 272 fits.
Shep
#Post#: 83233--------------------------------------------------
Re: Stihl 066 redlight
By: HolmenTree Date: September 13, 2018, 9:35 am
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The Husky handle had several of the screw holes a bit oblong
from loose screws , you know how Huskies are :D
But the tape measure said both the 066 and husky holes were 1
5/8" apart. The handle is a bit bent up. I don't even remember
where I got it from.
I did identify it by googling images of Husqvarna 61 268 272
handle bars.
#Post#: 83918--------------------------------------------------
Re: Stihl 066 redlight
By: trappermike Date: December 29, 2018, 3:46 pm
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I was a mechanic at a Stihl dealership from before the
introduction of the 064 to the introduction of the 066. The last
run of 064's to come out had the Red Light ignition,Stihl called
this "Digital" ignition,it worked fine and did indeed rev limit
at 12,500. Some fanatical fallers hated it,so to fix it I had to
install the ignition and flywheel from an earlier 064(usually
just using used parts). However there was a glitch to the
digital ignition,if you installed a non-resistor spark plug the
saw would misfire like crazy. Usually in modded work saws I
built I would use a 1 step colder plug without the resistor,such
as the Bosch WS5F,but when a I modded a brand new Redlight for a
customer it misfired and barely ran,a call to Stihl's tech I
found out they need a resistor plug,so I put one back in and it
was fine.
#Post#: 85014--------------------------------------------------
Re: Stihl 066 redlight
By: Chainsawrepair Date: May 2, 2019, 12:03 pm
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More info By Dave and Jacob
Thanks to Jacob J for the tons of good info on this topic.
Also attached is some interesting 064/066 documentation in a PDF
that I hadn't seen here before.
064 / 066 / MS640 / MS650 / MS660 Ignition Systems V1.0 6.25.15
Earliest illustrated parts list noted where known.
Flywheels aluminum with single keyway unless noted.
1122 400 1201A 064 for use with Bosch ignition, unlimited
coils
1122 400 1202 066W, MS660 for generator
1122 400 1203 - 064, 064R for use with limited coils 1303
[92.12ipl]
1122 400 1203 (double keyway) - 064, 064R for use with limited
or unlimited coils
1122 400 1203/1204 - marked with both but only one keyway,
normally limited
1122 400 1204 (single keyway) 064 for use with limited coils
ONLY
1122 400 1204 (double keyway) 064
1122 400 1206 064 for generator 3500 [87.1ipl]
1122 400 1207 - 064W for generator 4000 [92.12ipl] and generator
3500 [95.01ipl]
1122 400 1209 - 066
1122 400 1209/1214 - 066 marked with both but only one keyway
1122 400 1209/1214 066 double keyway
1122 400 1214 - 066, 066M with larger big end bearing from early
1995 [95.01ipl]
1122 400 1215 066 redeye
1122 400 1216 - 066W heated handles [95.01ipl]
1122 400 1217P 066 pre 1996 poly
1122 400 1217 MS650, MS660
1122 400 1218 066W, MS660 heated handles
Generators
1118 400 4000 064W [92.12ipl]
1122 400 3500 064W [87.1ipl], 066W [95.01ipl]
1122 400 3501 066W, MS660
1122 400 3502 066W, MS660
Ignition Coils
0000 400 1300 066 unlimited short mount
1122 400 1300 064, MS640 unlimited, dogleg mount, works with
generator 3500 [87.1ipl]
1122 400 1303 064 CDIC limited Prufex [92.12ipl]
1122 400 1307 066 CDIC-A limited including 066 red eye model
1122 400 1311 064/066 unlimited, easier starting, short life
span [95.01ipl]
1122 400 1312 - 066 poly flywheel three screw mount
1122 400 1314 066, MS650, MS660 two screw mount
Trigger Units
No number shown - 064 September 1987 to mar 3rd 1991 [92.12ipl]
There are at least two version of the 064 crankcase with
different mounting holes for the ignition coils.
QUESTION - I have a flywheel 1203/1204 with a single keyway,
when I line up the magnets with a dual keyway 1203 flywheel the
single keyway lines up with the 1:00 keyway rather than the
12:00 keyway when viewed from the outboard side. So is this a
limited or unlimited flywheel??
Thanks
Dave
44.86 is instructions for stocking parts for the new 064 models
43.86 is an introduction to the new 064 models with all the
technical specs, etc.
More Dave
I don't see any X or P markings on the 1203 dual keyway model, I
am wondering if the right or left keyway is the X?
the flywheel on the left here is a dual marked 1203/1204 and the
one on the right is the 1203 dual keyway, I cleaned it as best I
can without going ultrasonic and don't find an X or P anywhere.
Front of 1203 dual keyway
Front of single keyway 1203/1204 flywheel the slot lines up with
the right slot on the dual key above.
Pics are PB so held hostage.
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