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Author Topic: HolmenTree bikesaw projects.  (Read 6325 times)

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Offline HolmenTree

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Re: HolmenTree bikesaw projects.
« Reply #100 on: October 18, 2020, 01:03:02 PM »
Making a living with a saw since age 16.

Offline mike_belben

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Re: HolmenTree bikesaw projects.
« Reply #101 on: October 18, 2020, 02:56:44 PM »
Yeah exactly.. They have so much piston pushing on so much crank that they dont need rpm. Probably dont have the carb and ports for putting it all up top id bet.  But they can torque out of any hole in any gear. 

I had a husky 250 when i was about 13 .. I think it was a WR.. Similar power but you could use it a lot more often than a 500 in the woods.  It was flat power from bottom to mid.. Once you used up the mid it would rev higher but not pull harder.  If you upshifted it dropped rpm back into the curve and pulled again.  Whenever the rpm got low it had almost excess power, [for a kid anyway] almost didnt matter what gear. 


When i got a 450R fourstroke quad.. That was similar.  They feel like big blocks.  Like a truck engine in a minibike.  A cat 550 isnt that much different.  Keep piling on weight and they just keep pulling it up the hill without revving any higher.  Torque is nice for lazy riding. Its tolerant or your errors and doesnt take 3 shifts to fix a bog at the bottom of a hill. It just ripsaws its way up. Braaahpp.  

I probably cant even start a dirtbike anymore.  Now im feelin old!
Revelation 3:20

Offline HolmenTree

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Re: HolmenTree bikesaw projects.
« Reply #102 on: October 18, 2020, 06:00:47 PM »
The CR500 will sing at top end at about 7500 rpm by raising the exhaust port enough and milling .080" off the head.
Lots of potential. 
Making a living with a saw since age 16.

Offline HolmenTree

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Re: HolmenTree bikesaw projects.
« Reply #103 on: October 28, 2020, 11:00:43 PM »
I'm slowly piecing the 1984 Honda CR500R 514cc hotsaw project.
The new OEM short rod crank with billet Crankworks Pro Rods kit came tonight. Now I can do a mock up profile picture.
It will look much different when near finish,  2/3rds of the cooling fins gone, no transmission housing.
Major porting will be done with other bolt on performance parts greatly exceeding its stock 60 hp and 50 ft lbs of torque.


Making a living with a saw since age 16.

Offline HolmenTree

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Re: HolmenTree bikesaw projects.
« Reply #104 on: November 04, 2020, 12:26:14 PM »
well then you should know , the bigger the diameter of log the higher number of tooth the gear needs to be so the cutter cuts the full way across the block . If your cutter gets full it stakes the rest of the way across the block and starts bouncing in the cut . The chain your using we played lots with and went as high as 24 tooth gear on a rotax and after 20 tooth it made zero difference as was still a lot slower than high tooth setup running a 16 or 17 tooth setup
ehp,
I'm trying to decide what size .404 sprocket to put on the CR500
The 500 has the same size pto crank spline as the 250.
The 500 will peak at around 7000rpm with about 50 foot lbs of torque so I'm thinking no less then a 20 tooth .404.
I don't know anyone who has a CR500 bikesaw, might go 22T.
Making a living with a saw since age 16.

Offline HolmenTree

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Re: HolmenTree bikesaw projects.
« Reply #105 on: November 04, 2020, 11:08:02 PM »
So here I'm doing a comparison of my NOS 1983 Honda CR250R crankshaft on the left in the first pic alongside the Honda CR500R crankshaft.
The 500 crank has NOS OEM webs with a custom CrankWorks Pro Rods billet short rod kit.

They each share the same main bearings and same size 21 spline journal stub to except the same custom sawchain sprocket.

The main difference between the two is the 16T sprocket sized for the CR250R won't offer enough competitive chain speed for the double the size slower rpm CR500R.
I'm thinking 22T .404 to run the 19HX harvester B/C on the 500 for testing and practicing.
For competition,  then I better look high and low for  .500" pitch Oregon 10AL sawchain and get a 18T paddle sprocket made.


 

 

Making a living with a saw since age 16.

Offline Tacotodd

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Re: HolmenTree bikesaw projects.
« Reply #106 on: November 05, 2020, 06:10:28 AM »
Whhaaaat?????? I thought that you always went OE on pieces on “most” saws. I guess that this doesn’t qualify though ;D
Trying harder everyday.

Offline HolmenTree

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Re: HolmenTree bikesaw projects.
« Reply #107 on: November 06, 2020, 05:47:44 AM »
In my last post I forgot to mention the evolution design of the Honda CR series crankshaft.

In the first pic below here's some more pics of my NOS 1983 CR250R crank for again comparison to the crankshaft for my 1984 CR500R engine.

1984 was the first year Honda went to the "tin can" web covers, the 1983 was the last year for solid webs and internal stuffer plates this design went on into the 1990's formula 1 road racing bikes.
1984 was also the first year for Honda's Pro lite design piston in the CR250 and CR500.

So my 1983 250 has a good foundation for a highly modified top end cylinder.

Last 2 pics are the mighty  91mm CR500R piston.  
To show the versatility thinking of Honda this piston will fit a 1982 CR480R all the way to 2001 CR500R.



 


 

 
Making a living with a saw since age 16.

Offline HolmenTree

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Re: HolmenTree bikesaw projects.
« Reply #108 on: November 06, 2020, 05:58:03 AM »
Whhaaaat?????? I thought that you always went OE on pieces on “most” saws. I guess that this doesn’t qualify though ;D
Hehe, yeah I had to do a little editing to keep in good standing ;D

:D
Making a living with a saw since age 16.

Offline Tacotodd

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Re: HolmenTree bikesaw projects.
« Reply #109 on: November 06, 2020, 07:00:23 AM »
10-4! I was wondering.
Trying harder everyday.

Offline HolmenTree

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Re: HolmenTree bikesaw projects.
« Reply #110 on: November 20, 2020, 10:28:50 PM »
Well tonight my YZ125 and CR250R bikesaw carbs came in all the way from sunny Santa Ana, California to up here in freezing northern Manitoba Canada.  Last of the major parts for my projects. 

Art Gomez did an excellent job modifying and blueprinting these carbs to my engines specs. 
While modifying my brand new 38mm carb he found some porosity so he welded it out and finished the job repainting the whole carb. 
Excellent work. Thanks Art

Next will be a 44mm BJ carb for the CR500R. 


 

 
Making a living with a saw since age 16.

Offline Tacotodd

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Re: HolmenTree bikesaw projects.
« Reply #111 on: November 21, 2020, 07:39:19 AM »
Beautiful!!!  I was also wondering about your cataracts. Any update? Or am I mistaken? After all, any thing is possible, and some things are are highly probable. 

BTW, good to see you out there still plugging away!
Trying harder everyday.

Offline HolmenTree

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Re: HolmenTree bikesaw projects.
« Reply #112 on: November 21, 2020, 10:36:57 AM »
Beautiful!!!  I was also wondering about your cataracts. Any update? Or am I mistaken? After all, any thing is possible, and some things are are highly probable.

BTW, good to see you out there still plugging away!
Hey thanks. 
Yep just finished my last eye last week. Got 2 new "made in Texas" lens installed, and all I can say is WOW with the bright colors I look at and no more cloudy white glare . Like cleaning a very dirty window.  :D
Due to the time frame of my double eye surgeries I have to avoid dust and heavy lifting, I've been taking it easy doing R&D.
Making a living with a saw since age 16.

Offline Tacotodd

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Re: HolmenTree bikesaw projects.
« Reply #113 on: November 21, 2020, 01:31:45 PM »
Isn’t it hard to do much R&D? I mean, no heavy lifting and all. 

Don’t get me wrong, I know that quite a bit of R&D can be done just doing the “paperwork” research, but real world development comes from your doing it. And YOU are a hands-on type of man! I know that you are just ITCHING for that time (however long it is) to have passed. But even then, take it easy and follow the Docs orders. 

Just don’t be TO sedentary, blood clots might develop. Best thing that I’ve seen, hand wash some dishes. 2 things happen from that. It gives great appreciation for dishwashers, and makes you understand some of the lifestyle of a much older generation (back in the day)!
Trying harder everyday.

Offline HolmenTree

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Re: HolmenTree bikesaw projects.
« Reply #114 on: November 21, 2020, 09:24:25 PM »
Tacotodd, well said. I can relate to alot of what you said.
When I was a kid on the farm running water was me running to the well with a bucket. Winter time was melting snow in a tub on the wood burning cook stove.

Every morning and late afternoon after school was chopping ice holes in the dugout to water 30 head of cattle and a few horses.
Dad and I put up hay for the livestock winter feed with a pull behind mower, hay rake, pitch forks and a hay rack wagon.

Lots of machinery fixing and putting in a crop on 2 quarters of land with a open cockpit gas tractor.
When I turned 16 I learned to cut and skid tree length softwood 8 hrs a day 5 days a week for many years.
Today turning 63 in a few months I'm settled in nicely running my own seasonal tree service operation with no employees. Life is good, but like my wife said I need to do some maintenance on myself  :D Clear vision is nice!

Still admiring my carbs I just got back from the builder.
How's this for flow blending?
Beautiful work on this 40mm.


Making a living with a saw since age 16.


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