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Author Topic: Building my own two-stroke "Mongrel" - Inspired by CharlieT & TedT  (Read 19469 times)

Offline BillyGoat4130

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    • Live Oak FL Real Estate


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The question isn't who is going to let me, it's who is going to stop me.
You can't reason with the unreasonable.
Too dumb to quit.

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Offline BillyGoat4130

  • Posts: 174
    • Live Oak FL Real Estate


A little out of practice,  and I don't have a positioner but there is my new steering neck.

Sent from my SM-N910V using Tapatalk

The question isn't who is going to let me, it's who is going to stop me.
You can't reason with the unreasonable.
Too dumb to quit.

Insta: https://www.instagram.com/hondaatc/

Photography: http://wgolightly.smugmug.com

Real Job: http://landsofnorthflorida.com

Offline BillyGoat4130

  • Posts: 174
    • Live Oak FL Real Estate


Some fit up amongst the frame

Sent from my SM-N910V using Tapatalk

The question isn't who is going to let me, it's who is going to stop me.
You can't reason with the unreasonable.
Too dumb to quit.

Insta: https://www.instagram.com/hondaatc/

Photography: http://wgolightly.smugmug.com

Real Job: http://landsofnorthflorida.com

Offline BillyGoat4130

  • Posts: 174
    • Live Oak FL Real Estate
A few pics from my DSLR - I have posted mostly from my cell but I take pictures with the real camera from time to time for posting and review later on.

2 pics from the "mock up" where I leaned the front end against the frame and laid a tank on the back bone.

My old man sitting in front of the South Bend making some bushings to fit in the steering neck so it will go on my frame fixture I built

Steering neck with bottom bushing welded on. Laying in the lathe bed way so dad can check it with the calipers against his work piece periodically

Frame fixture I built about 5 years ago to be able to replace certain sections of the stock ATC250R frame when changing out engines or replacing damaged sections. It mounts to the swingarm pivot, foot pegs, and 2 engine mounts. The all thread is adjustable and allows me to change the angle and height of the steering neck. It will need a little modification for this project but not too much.

Just another angled view of the frame fixture
The question isn't who is going to let me, it's who is going to stop me.
You can't reason with the unreasonable.
Too dumb to quit.

Insta: https://www.instagram.com/hondaatc/

Photography: http://wgolightly.smugmug.com

Real Job: http://landsofnorthflorida.com

Offline BillyGoat4130

  • Posts: 174
    • Live Oak FL Real Estate
Dad finishing up a parting tool cut on a bushing from what I remember

Shop dog!
The question isn't who is going to let me, it's who is going to stop me.
You can't reason with the unreasonable.
Too dumb to quit.

Insta: https://www.instagram.com/hondaatc/

Photography: http://wgolightly.smugmug.com

Real Job: http://landsofnorthflorida.com

Offline teazer

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Looking good but still looks really tall.  Just out of interest, how high was the steering stem on the donor bike versus how high was the swingarm pivot?  I suspect that the larger donor bike frame was much taller and the pivot lower.  At least it would explain why it looks so tall.

Offline BillyGoat4130

  • Posts: 174
    • Live Oak FL Real Estate
Looking good but still looks really tall.  Just out of interest, how high was the steering stem on the donor bike versus how high was the swingarm pivot?  I suspect that the larger donor bike frame was much taller and the pivot lower.  At least it would explain why it looks so tall.

Donor bike for the front and rear end, the SV650? Or the ATC250R? The SV engine by itself is ginormous compared to the tiny little ATC250R.

I don't have those dimensions off hand, I keep my SV650 I ride at the office off the dirt roads. But my fork rake angle is right on 25 degrees which is what the SV is. My forks are not slid down in the trees anymore than usual. I'd be very surprised if the height of the steering neck itself was significantly different than this at full extension. Don't really know how it could be?
The question isn't who is going to let me, it's who is going to stop me.
You can't reason with the unreasonable.
Too dumb to quit.

Insta: https://www.instagram.com/hondaatc/

Photography: http://wgolightly.smugmug.com

Real Job: http://landsofnorthflorida.com

Offline teazer

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Exactly.  If you think about an SV650 and then fit a smaller motor and then make the engine cradle smaller to fit the steering head, the cradle and rear shock pivot will be much higher than on an SV and that's why the swingarm droop is so significant.  What that suggests is that the forks should be "shorter" to drop the engine cradle and rear pivot to more usual levels for a street bike.

Or make a slightly taller frame to drop the pivot and keep the top of the frame where it is.  What is the height of the seat frame rails if you add the height of tires to number as it sits now?

Offline BillyGoat4130

  • Posts: 174
    • Live Oak FL Real Estate
Assuming I put a level subframe across the back - about 32-33in from my estimates (With no sag).
« Last Edit: Jan 22, 2017, 18:00:21 by BillyGoat4130 »
The question isn't who is going to let me, it's who is going to stop me.
You can't reason with the unreasonable.
Too dumb to quit.

Insta: https://www.instagram.com/hondaatc/

Photography: http://wgolightly.smugmug.com

Real Job: http://landsofnorthflorida.com

Offline teazer

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That is surprising. Not as high as it looks.  I was looking for ways to reduce the swingarm droop to something more workable on the street.  I guess it's going to be what it's going to be. Nice home made jig BTW and always good to have a family member to help out.