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#Post#: 74948--------------------------------------------------
Re: Whats on your bench today
By: Gatekeeper Date: December 17, 2016, 5:53 am
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Cool build. I'd like to see it run again.
#Post#: 74949--------------------------------------------------
Re: Whats on your bench today
By: chy_farm Date: December 17, 2016, 7:22 am
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Wonderful to see Holmen Tree, did you post some more pics here
in this site for the detail of this saw? Look forward to seeing
more.
Chy
#Post#: 74954--------------------------------------------------
Re: Whats on your bench today
By: HolmenTree Date: December 17, 2016, 9:24 am
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Thanks guys.
Good to see you again chy_farm ! I like your cool twin pipe
build on your Echo.
Which reminds me, I'm going to start a thread of this YZ rebuild
on the Modified Ported Work or Race Saws section.
I fixed the lighting in my shop for better photos, funny how a
old technology incandescent light bulb over my work bench can't
be compatible with the camera on my Samsung phone :D
I got my motivation from Ken Steeves with his historical hot saw
rebuilds. So I'm going to to take my time with this saw rebuild.
Even though it's only historical for me :)
Amazing what you can do with the Internet today. I was finding
brand new OEM parts for my 1982 YZ125 J.
I'm going to order lots of cylinder head O rings and base
gaskets before their all gone.
Even found a set of 1982 YZ125J sand casted factory works race
cylinders . :o
I plan on racing this saw again one day for the fun of it. Might
not have the power of a big Rotax . But I will get it under 30
lbs with b/c included. Alot better then trying to cold start and
steer a 60 lb plus Rotax.
For any of you guys who know who Ron Hartill is. He was 7 time
World Lumberjack champ at Hayward Wisconsin in the 70's and
80's.
I was in Ron's shop in the summer of 1988 after a competition.
Ron was showing me his 135cc B-Bomb kart hot saw. A saw he was
beating 250cc bikes saws in 20" wood in the States.
He liked my YZ engine alot and he said the left hand drive was
definitely not a handicap.
His advice was I have to make the Yamaha as compact as possible.
He said the cold start and between cuts with a consistent
reliable saw is the deciding moment when you win or lose. Drive
sprocket gearing is very important. Alot of guys run too big of
a sprocket on their hotsaws for the type of wood their cutting.
He said it's not the most powerful saw with unpredictably to
cut at a show that wins.
It's the consistent reliable saw with a good operator who also
knows how to put a good edge on his chain who has good luck.
#Post#: 74961--------------------------------------------------
Re: Whats on your bench today
By: 3000 FPS Date: December 17, 2016, 6:10 pm
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You have some interesting history Holmen.
#Post#: 74964--------------------------------------------------
Re: Whats on your bench today
By: chy_farm Date: December 18, 2016, 3:03 am
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>Good to see you again chy_farm ! I like your cool twin pipe
build on your Echo.
>Which reminds me, I'm going to start a thread of this YZ
rebuild on the Modified Ported Work or Race Saws section.
Thanks Holmen, it's very nice to know this, look forward to
reading your new thread.
My twin Echo has a lead valve after her carb, and this lead is
relatively a big one comprises of 4 big lobes, so this means she
was made not for very high rev machine. Asked Echo on the
highest rev spin, their reply was nearly 11000rpm for this twin.
Shame I wanted to spin her over 13500,,,,Anyways I have to do
something better for her port. Your coming thread will surely
help me do this job!
Chy
#Post#: 74971--------------------------------------------------
Re: Whats on your bench today
By: HolmenTree Date: December 18, 2016, 3:13 pm
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Thanks for the kudos Chy and 3000,
I haven't started the new thread yet, presently working on a
"studio light setup" for taking photos of the saw on the
workbench. I got influenced by the article I posted below.
I have a couple of umbrellas and some white spray paint ;D
Plus a proper lamp.
Great article on the Echo 610 twin. Chy, I think you were
talking about the double reed valve setup.
Not rushing into my saw rebuild I have come to a conclusion to
build with carbon fibre. I'm tossing around the idea of building
a integrated rear handle , top handle and fuel tank with the
carbon fibre.
Lot's of info on the net about working with carbon fibre. But I
do have a good connection with my oldest brother who built
drones and their software for the U.S. military since the
1990's. 8)
#Post#: 74974--------------------------------------------------
Re: Whats on your bench today
By: chy_farm Date: December 19, 2016, 2:23 am
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Very nice reading Holmen thanks, and yes you are right. I am
watching this;
(HTM) http://www.dragonfly75.com/moto/reeds.html
(HTM) http://www.dragonfly75.com/moto/reeds.html
If I were able to fabricate a special carbon fiber plate that
would be the best one for her!
Chy
#Post#: 74976--------------------------------------------------
Re: Whats on your bench today
By: HolmenTree Date: December 19, 2016, 6:23 am
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Good reading Chy about the reed valve. I have a 30 year old set
of Boyesen reed petals for my Yamaha but their yellow color so
their not carbon fibre. But I see the new Boyesen are now black
color carbon fibre.
I still have the factory stainless steel reeds in the saw which
I trusted more back then.
Lot's of poor advice 30 years ago from the moto cross experts
when I built and ran the YZ hotsaw . Totally different operation
application from each other. Things like tune pipe stinger
length to ignition timing.
#Post#: 74977--------------------------------------------------
Re: Whats on your bench today
By: chy_farm Date: December 19, 2016, 7:29 am
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I think you are mentioning a very good point Holmen, this
stinger length and diameter are things I think most. Have been
reading this graph here;
(HTM) http://www.dragonfly75.com/motorbike/images/backpressure.gif
the original site is here;
(HTM) http://www.dragonfly75.com/motorbike/stingersizing.html
Chy
#Post#: 75006--------------------------------------------------
Re: Whats on your bench today
By: HolmenTree Date: December 20, 2016, 9:38 pm
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Chy, good info there. I found the factory pipe worked good for
me...... but a custom made pipe for quick throttle response and
max WOT power will one day be in my plans.
I'm still getting my tools and shop organized and have to buy a
new lamp tomorrow for my "studio lighting " for taking pics of
my project....before I start my new thread ;D
That's how I operate, do it right . ;)
I can't believe how much new OEM parts are available for my
engine on the net.
Wouldn't this new Yamaha factory works race sand cast cylinder
be nice on my engine. If only I could justify the $971 price
tag. :o
Scroll through the 9 pics. Would be about 2 lbs lighter then my
cylinder with the chrome bore and no cast iron liner.
(HTM) http://m.ebay.ca/itm/142218972962?_mwBanner=1
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