064 and 066 Crank Case weight's and measure

I'm working on 3 064's and 1 066 pre-Poly Fly Wheel, I know a few have been
putting 066 PC on 064 case's. I think for the lighter weight and smaller crank case.
I thought I would weigh and measure 064 and 066 case's.

064 and 066 pre-Poly Fly Wheel crank case are the same size. I have read that
066 case is wider, from what I see it is not. Fly Wheel and starter are wider on 066
and looks to me like that a 064 FW and starter could be used on 066 to narrow 066 up to width of 064,
would also need to use 064 brake lever.

066 on left.......5/8 inch wider than 064


As far as weight of stripped cases with bar studs and AV mounts.

066=2lbs 10.2oz
064=2lbs 7.6oz
064 -2.6oz

Crank shafts, this 066 crank has 13 big end rod bearings (better), 064 has 12 bearings, I think later 064 had 13.
066=1lb 4.8oz
064=1lb 4.6oz
064 -0.2oz

Starters
066=15.6oz
064=13.2oz
064 -2.2oz

Fly Wheels
066=1lb 2.4oz
064=1lb 1.8oz
064 -0.6oz

So it looks to me if you can use 064 Fly wheel and starter on 066 you
will have an 066 that is only 2.8oz heavier than 064 with a better
crank case (heavier gusset's) and a crank shaft with bigger, big end rod
bearing. And it will be the same width as 064. Also no drilling of case to get
066 PC to fit 064 case just a parts swap.

I'm just the other way around, I will put the better 066 crank in 064 case and
put the wider fly wheel and starter on 064 for better cooling.

This is the only pre-Poly Fly Wheel 066 that I have to weigh and measure.
So don't take any of this to be 100% correct. this is just what I found in this
case or case's

WOW.... thanks trigger, that is certainly enlightening

Sawdustmaker said:

WOW.... thanks trigger, that is certainly enlightening

Click to expand...

Thanks,

Here is where 066 case comes up with the very little extra weight, marked in red.

Gary- thanks for taking the time to illustrate the differences between the 064 and 066 components. It's hard to describe to people the differences without pictures. Yes, you can definitely put an 064 flywheel and starter on an early 066 case and have a narrower, lighter saw (as long as the correct flywheel/ignition combo is used and there's no timing issues.)

Jacob J. said:

Gary- thanks for taking the time to illustrate the differences between the 064 and 066 components. It's hard to describe to people the differences without pictures. Yes, you can definitely put an 064 flywheel and starter on an early 066 case and have a narrower, lighter saw (as long as the correct flywheel/ignition combo is used and there's no timing issues.)

Click to expand...

JJ, has the 066 starter and fly wheel always been wider than the 064 from day one?

I also mounted an 066/660 poly FW starter on this 066 alum. FW, and used
it to start it many times before pulling it down, from what I could see the newer starter will work on older 066.

Also when you re-drill for 6mmX25mm screws for 066 cylinder bolts on 064 case
you are kind of piss'n in the wind. look at the extra length of 066 case
in areas for the 6mmX25mm screws on both sides of 066 case. Marked in blue.
I'm sure I'm missing some other things also.

Excellent info Trigger-Time. I didn't realize that there were two versions of the early 066/064 crank. I just found the Technical Information though that explains that the 13 roller crank was put in the 066 from SN x 29 588 002 and up. The 12 roller was still used in the 064. So I suppose the improved 066 crank could be used in a 064 case as well. Your suggestion to just use a 066 with 064 flywheel and starter makes a lot of sense. You get the best of both worlds with the bigger rod bearing and lighter weight of the 064 and don't have to mess with slotting the 066 jug to fit the 064 case. Way to go for thinking outside the box!

You can see also in the red box on clutch side of 066 that it
has a internal oil passage from the oil pump to bar oiler hole (IMO better).
064 oiler uses a hose that runs from pump to bar oiler hole (slot).

I think you've just killed the spike in 064 sales we've helped push around here. I really like this option you've put on the table.

good info.

thanks triggertime for that informative info.I bought a 064 brand new sometime before the nineties and ran it for 1 season.I kept it for a back up to a back up for a couple of years in the truck, before it found its way to the barn.never really knew that much about it.ran 066 ever after.dug it out last week,put a new fuel line,filter, and rebuilt 066 carb on it and it fired right up.stole a 3 foot bar and 404 chain from another saw and fell some fence line trees with it.I dont really need it,so it will probly be sold soon. thanks for the info,dan.

blsnelling said:

I think you've just killed the spike in 064 sales we've helped push around here. I really like this option you've put on the table.

Click to expand...

That will leave more for me then

Used 064 for yard work today, 2007 ice storm stripped limbs of easten red ceder.
I had cut stump about four foot high and really didn't want to cut it much
lower. Yard fence was attched to it years ago and knew I would hit nails
or something.......got lucky nothing but wood Now wife can set
flower pots or what ever (frog) on stump.

Thanks for sharing this information.


Mr. HE

Trigger-Time said:

JJ, has the 066 starter and fly wheel always been wider than the 064 from day one?

I also mounted an 066/660 poly FW starter on this 066 alum. FW, and used
it to start it many times before pulling it down, from what I could see the newer starter will work on older 066.

Click to expand...

Yes, and yes. When the 064 was originally developed it was designed in-line with the family of saws that started with the 024. All those saws were meant to be ultra-modern with high power-to-weight ratios.

When designing the 066, the thicker flywheel and started were implemented for additional cooling.

Jacob J. said:

Yes, and yes. When the 064 was originally developed it was designed in-line with the family of saws that started with the 024. All those saws were meant to be ultra-modern with high power-to-weight ratios.

When designing the 066, the thicker flywheel and started were implemented for additional cooling.

Click to expand...

Thanks,

Who will be the first to use 064 FW, Starter and 064 hood on 066
or 066 BB at a GTG and pass it off as a mean running 064......would bet it has been done before

Am bumping my own thread.

I had picked up a 064 and 066 for cheap cheap from dealer.
Guy I know was going to have them fixed, but it was going to cost
more than he wanted to spend. Owner didn't want to even spend
the money for estimate bill $35, so I did. Now owner want's his
saws back and thats fine by as long as I get my $35 back.

Anyway the deal is, owner thought he had two 066's and I think
dealer thought the same. As we talked about them for a few minute's
and i give him ever chance to say the one is an 064 not 066.
I never said a word that I knew one was 064.

064 is missing the 064 tag, I talked to owner on the phone, he said
he bought the 064 as 066. I see oil pumps and other parts listed
on ebay saying the parts fit 064 and 066. 064 oil pumps will not fit
066 and the other way around.

Have seen people post a picture of an 066 they just picked up
and it turns out to be 064.

Am bumping this thread so a few more may learn how to tell a 064 from 066.

Very good thread TT,thanks for taking the time.

TT's technical posts are great. Lots of facts and pics, not much BS. :rockn:

Just going from memory here, I don't *think* the holes need to be drilled deeper for the 6x25 bolts. The extra bolt length merely compensates for the 066's thicker cylinder base, so thread engagement should end up about the same, which is the whole idea.

mtngun said:

TT's technical posts are great. Lots of facts and pics, not much BS. :rockn:

Click to expand...

Thanks, but allot of my post is stuff I picked up here from
guys like you, Lake, TW and JJ and others I'm just repeating it.
Too make myself look good

Now I have to go install a New PC kit on 064

TT

Gary...

Thanks for the link back to this thread. Very, Very useful information as to why Stihl has incremental upgrades to saws. They get field reports and make improvements. Always wondered if this was the case and you illustrated it perfectly.

...Carl