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Author Topic: Building my own two-stroke "Mongrel" - Inspired by CharlieT & TedT  (Read 32403 times)

Offline BillyGoat4130

  • Posts: 179
    • Live Oak FL Real Estate
Hi Guys,

A little back story first. I have been a life-time rider in the dirt. Started on 3wheelers when I was a kid, rode quads, dirt bikes. Didn't get into street riding until about a year ago. I have had ATC250R 3wheelers for about 15 years now, and they are great machines. I must give credit where credit is due - I stumbled onto some pictures and build thread of CharlieT / Checkered Past Cycles' "Mongrel" build where they took an ATC250R frame and engine, and put a Buell Front end, CBR F2 rear end on it, and made a very cool 250cc road machine....


http://www.dotheton.com/forum/index.php?topic=53028.msg669086#msg669086

Ever since I saw this thing, I had to have one.


I have built 3wheeler and quad parts for myself for a long time, I am handy with a tig welder and I know enough machining to make myself a danger to my own health...:)

My dad and I finished up a project engine for an ATC250R about 2 years ago, and ever since that was completed I've been kind of day-dreaming about building a 2wheeler to put this custom power plant in we built. It started life as scrap ATC250R engine cases. I procured a Skidoo Summit 800 cylinder and head, and long story short basically welded/machined/hacked those parts to make myself a 410cc counter balanced 6 speed 2 stroke engine (with custom pipe...)

(my dad holding the exhaust when we finished it 2 thanksgivings ago)


So, this gives you a little idea of what kind of crazy shit I dream up and throw together....lol



So, the plan on this beast I am building is an 85 ATC250R frame, with an old clapped out motor to begin with before I put the rotax conversion in it. The front and rear end are SV650 units I have already bought. The frame is titled MC. The SV650 front end parts should be here right before Christmas and should allow me a few days to do a little mock up and see how much modification to the steering neck and steering stem areas will need to be done.

Should be a pretty cool machine!
« Last Edit: Dec 16, 2016, 13:22:23 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/

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Real Job: http://landsofnorthflorida.com

Offline BillyGoat4130

  • Posts: 179
    • Live Oak FL Real Estate
Re: Building my own two-stroke "Mongrel" - Inspired by CharlieT
« Reply #1 on: Dec 16, 2016, 12:11:33 »
The humble beginnings of the 2 wheeler project....

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 VonYinzer

  • DTT SUPPORTER
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  • Posts: 18367
Re: Building my own two-stroke "Mongrel" - Inspired by CharlieT
« Reply #2 on: Dec 16, 2016, 12:26:06 »
YES
Like a river that don't know where it's flowin'
I took a wrong turn and just kept goin'

Offline advCo

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The Mongrel is a beast. I am in.


Sent from my iPhone using DO THE TON
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline canyoncarver

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Re: Building my own two-stroke "Mongrel" - Inspired by CharlieT
« Reply #4 on: Dec 16, 2016, 12:29:46 »
Cowa friggin bunga man.
--
73' The Commando
YZF750/1000R The Fly
KZ 750 Twin
ZRX 1100
KZ400 The Rabbit
KLR650, more Nortons, a BSA, my 93" shovelhead chop, an 86' FXR, and an F9 Bighorn
more YZF750R's, more KZ's, a Zephyr750...and the ever unfinished 75' CB550 cafe.
--

Offline TedT

  • Posts: 2
Holy crap! There's our bike!Billygoat, that is so freaking awesome. I'm so stoked to see another one coming together.

One thing you're going to find is that the stock neck is waaaaaay too steep to work as it is. We added 12 degrees to it to slow down the steering, and also to get clearance for the front end. We braced the tube internally while we were at it.

Trust me, you are going to freaking love that thing. So light, so responsive. Anything we can do to help, let us know!


Sent from my iPhone using DO THE TON

Offline clem

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That bike is very cool in person. CharlieT is too.

Sent from my SAMSUNG-SM-G920A using DO THE TON mobile app

"After every war there are soldiers who refuse to surrender. To this day there are still thousands who cling to their 30+ year old motorcycles, thinking that the war is still on, refusing to concede that the four-strokes have won"

1972 DS7 http://www.dotheton.com/forum/index.php?topic=45886.msg505995#msg505995
1983 CB550sc bobber http://www.dotheton.com/forum/index.php?topic=30599.30

Offline JustinLonghorn

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  • No Purple Hearts, No Blue Ribbons
Re: Building my own two-stroke "Mongrel" - Inspired by CharlieT
« Reply #7 on: Dec 16, 2016, 12:49:06 »
I am on board.
I'm going to eat your brains and gain your knowledge.

Into The Sunset, CB750 build

TT500 the Animal


Offline Hurco550

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Woohooo. I'm watching
"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet