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#Post#: 74904--------------------------------------------------
Re: Whats on your bench today
By: HolmenTree Date: December 15, 2016, 2:26 pm
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Got the YZ125 bikesaw on my bench finally
Hasn't run for about 10 years, pretty dusty.
I built this saw in my garden shed 33 years ago when I was 25
years old
Was married with 2 kids aged 3 and 1with one on the way. Wife
car hop waitressed in a orange mini skirt outfit at the A&W. I
felled timber .
Going to strip the saw right down and rebuild it to be lighter,
more compact and ergonomic. Will look into turning the crank
around and running the b/c right hand drive.
Powerhead weighs 32.6 lbs (used the wife's bathroom scale lol).
I'm quite positive I can get it down to 25 lbs or less on a good
diet.
Running a 42mm Tilly HD carb with H L screws. Spare 34mm HR
carb. Also got a 34mm Mikuni diaphragm Alkyl carb.
I got a brand new P/C and crank in it broke in nicely with about
15 minutes run time on it. Spare P/C with a fresh .050 over
bore.
Notice my oiler setup on the last pic. I built it with a
Schrader blow gun tee'd into the bottom of the kart oil tank
connected to the bar pad with a oil line. The blow gun lever is
connected to the carbs throttle trigger by a bicycle brake cable
assembly. Bicycle pump pressurizes the chain oil tank.
That setup alone is about 2 pounds.
Getting rid of the heavy generator rewind starter.
Will run the pipe under the saw like what's done today. Might
replace the glycol cylinder coolant with Slick 50 /bar oil to
feed the b/c.
Good way to spend the winter off season 8)
#Post#: 74916--------------------------------------------------
Re: Whats on your bench today
By: 3000 FPS Date: December 15, 2016, 9:44 pm
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Well Holmen you definitely hit the cool factor on this one.
Will be interesting to follow your transformation on it.
#Post#: 74920--------------------------------------------------
Re: Whats on your bench today
By: HolmenTree Date: December 15, 2016, 10:30 pm
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Thanks 3000.
Yes looking forward to the rebuild. Too bad I didn't know what I
know today back then.
but I have to say I probably had better focus and a more clear
mind at age 25 to get it built with what little resources I had
to work with.
I always kept a keyed 11 T 3/8 spur sprocket on it. Just set the
depth gauges at .040 - .050 and let her rip in the small wood.
Sounds crazy but I never had a tach on it. Only know it's
peaking lots but not getting away.
Want to experiment with the .404 high tooth but I think a 10T
.404 sprocket would be all I need going right up into the
16"-20" wood.
Kevin if you want to move these posts to the race section go
ahead. Call the thread YZ125 upgrade :D
#Post#: 74922--------------------------------------------------
Re: Whats on your bench today
By: dutchsawdoctor Date: December 16, 2016, 12:22 am
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sure holman hit the cool factor on this one, sorry tho see this
history go
but wat i read, we will see ( hope hear to ) a way cooler Hotsaw
;D
#Post#: 74926--------------------------------------------------
Re: Whats on your bench today
By: Eccentric Date: December 16, 2016, 3:59 am
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That looks to be a 1982 YZ125 engine. The 1981 and 1983 (and
later) were very different. I had a friend with a 1981 YZ125.
1980 and earlier were air cooled. 1981 was liquid cooled, with
a 'square' jug and no YPVS. 1982 was 'square-ish' and had the
YPVS. 1983 and later had rounded jugs and various forms of the
YPVS.
#Post#: 74929--------------------------------------------------
Re: Whats on your bench today
By: HolmenTree Date: December 16, 2016, 11:35 am
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Yep it's a 1982 J. By far the most powerful 125 dirt bike engine
during that era. This J model engine was out powering all the
previous years of factory works bikes.
With just shortening the header pipe and milling the head it
will match today's 125 top end power.
I went up and beyond with a 42mm carb (stock was 34mm Mikuni SS)
but never touched the porting which I'm told was near perfect in
that one year.
#Post#: 74932--------------------------------------------------
Re: Whats on your bench today
By: Chainsawrepair Date: December 16, 2016, 1:42 pm
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Been seeing folks use fillers to make their own light weight
bars now days. What did you use as filler back then?
[member=22]HolmenTree[/member]
#Post#: 74934--------------------------------------------------
Re: Whats on your bench today
By: HolmenTree Date: December 16, 2016, 2:11 pm
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[quote author=Cut4fun . link=topic=1732.msg74932#msg74932
date=1481917358]
Been seeing folks use fillers to make their own light weight
bars now days. What did you use as filler back then?
[member=22]HolmenTree[/member]
[/quote]
I put a aluminum disc centered in each hole and then filled it
from each side with JB Weld. Still holding after all those years
Bar is still stiff enough. But I wished I never did it.
Was a beautiful bar polished like chrome by General Bar Company
out of Tigard, Oregon. Cost me $50 and I supplied the 2 7/8"
Oregon roller nose.
I modified it with the filled holes a few years later.
#Post#: 74941--------------------------------------------------
Re: Whats on your bench today
By: HolmenTree Date: December 16, 2016, 6:54 pm
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Here's a pic of the tail of the General bar and 11 tooth 3/8
spur sprocket. I have a 13 pin Danzco rim for comparison.
I feel the 11 tooth spur is a good fit for the high revving 125.
The 16" 3002 mount .050 bar is 0.160" thick
The 25" 3002 mount .063 bar is also 0.160"
My thinnest bar is a 16" 3003 mount .050 at 0.135" thick.
A standard bar is 0.182" thick.
The salmon belly bars were fine for our central region 3 down
cut only in the modified event.
But time is wasted between cuts in the down, up, down.
I'll be getting a narrower bar with the 2 7/8" roller.
Dang I got the 13 pin rim sitting too close to the camera making
it look bigger then it is.
I'll post another pic.
#Post#: 74942--------------------------------------------------
Re: Whats on your bench today
By: HolmenTree Date: December 16, 2016, 7:26 pm
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Here's a better picture with the 13 pin rim in comparison to the
11 tooth spur.
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