Terra two piece

sparkwizard

sparkwizard

#1
#1
I bought this top piece for a Terra two piece frame last year because it was only $25 plus shipping. I have been wondering what to do with it all winter.
We came up with a plan, and we ordered a second one to cut up and, well, you'll catch on if you're patient. Pictures are terrible and the barn is always a mess, but we did get started on it today. IMG_20240419_113554.jpg IMG_20240419_114400.jpg IMG_20240419_115242.jpg IMG_20240419_115400.jpg IMG_20240419_120435.jpg IMG_20240419_123848.jpg
 
sparkwizard

sparkwizard

#2
#2
That engine looks small in there, but we wanted the option to put a Briggs flat head in there. There is just enough height for the Briggs to slide in there with the spark plug removed.
We searched for wheels and tires all winter.
Go Power Sports had these CT100U parts really cheap, so we ordered them. They are pretty wide. I had to cut the Gemini swing arm to fit, which caused more headaches. I might end up using a CT100 fork, too.
 
sparkwizard

sparkwizard

#3
#3
The way those two frames got cut, I extended the top one by almost 5 inches.
I had planned to put the swing arm inside the frame, but with the wide wheels, that is not possible. I might shorten the swing arm or just move the shock mounting point forward. It just depends on how long the wheelbase is after we get a fork on it.

Yes, a cement block is about one inch taller than a 5 horse Briggs.
 
sparkwizard

sparkwizard

#5
#5
I had to weld some pieces together so they would stop moving around and falling while I am taking measurements and figuring out how to proceed. I might end up making a fork after all. Even with 6 inches of ground clearance, the front tire is pretty close to the frame.
 

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RobertC

RobertC

#6
#6
Hey Dave, that is looking great !

Make yourself a set of Earles leading link forks, with the wheel toward the front, if you know what I mean.

It'll utilize the same rake, but will move your wheel forward, away from the frame.
 
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sparkwizard

sparkwizard

#9
#9
When we first started this project, I was thinking about some old school 6 inch stud tread, narrow tires. The general idea was to use a clutch and a band brake on a jackshaft in front of the Gemini swing arm. However, my son, Will, loves his CT100U and his lock-em-up disc brake.
We got the front tire and wheel, rear tire, wheel, rotor, sprocket, axle, bolts and spacers for about $60. As I mentioned earlier, they are really a lot wider than the swing arm. I cut that and made it fit. Now, I line up the swing arm so the pivot point is (roughly) centered in the chain (If no jackshaft) on a Briggs 5 horse. IMG_20240426_091240.jpg IMG_20240426_091240.jpg
 
sparkwizard

sparkwizard

#10
#10
Now, the sprocket is on the other side, so let's go see what we have gotten ourselves into... IMG_20240426_091540.jpg
It looks like the chain needs to go pretty close to the middle of that frame tube. We decided to keep the frame the way it is, and "just notch the frame, Dad!".
 
sparkwizard

sparkwizard

#11
#11
I need a pivot to bolt the swing arm to. I also need to mount a jackshaft between the frame and the engine plate., so I need a "simple" solution here. Did I mention it also needs to be really cheap? Keep reminding yourself, "this is a hobby. We like projects. They keep the creative juices flowing". I once asked Mario Andretti why he is still driving really fast at Indianapolis testing tires for Firestone. I am sure he was in his late sixties. He said "It keeps the juices flowing".
So My creative juices are in Andretti mode now.

True story.
 
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sparkwizard

sparkwizard

#13
#13
The engine is a Jacobsen 2 stroke rated at somewhere between 2.5 and 4 horsepower. I have been buying then as I find them, because they are great engines and parts are hard to find. I have several of them. Parts interchange. I have it mounted on a vintage kart racing mount for a Mcculloch, I think.
The most recent one I received was from a snow blower that @hermans13 was kind enough to find for me. He also built a shipping crate that is a definite keeper, with Jacobsen logo and all! Thank you Sir! IMG_20240426_092501.jpg IMG_20240426_093910.jpg
 
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sparkwizard

sparkwizard

#15
#15
Busy morning here.
 

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sparkwizard

sparkwizard

#16
#16
And that is where I finally ran out of that old roll of nasty flux core wire. Tomorrow I can go get a fresh bottle of gas and put a roll of solid wire in the welder. I know I have some gopher holes to fill in this thin metal once I start grinding these nasty flux welds.
 
sparkwizard

sparkwizard

#18
#18
My imaginary brain has been busy during the month I have been waiting for a torque converter to be delivered.
I hate UPS. The part was picked up in Ohio, shipped to Savannah, Ga, and it sat there for a week. I assume that was so the Georgians could pick through it and see if they could use anything. Then, it went to Virginia, back to Columbus, OH, then Akron, OH.
Now, it is marked as "out for delivery". Anyway, I think I can fit it under the seat with two jackshafts. One to slow down the driver and multiply the torque from the little smoke motor. I can adjust the engagement with springs, but I can't boost torque without a jackshaft.
Second jackshaft will be mounted ON the swing arm, so I can run a 40 tooth sprocket on the wheel for chain clearance and more gearing options, which I will need. I want to keep the little Jacobsen right at its pitiful, little torque peak all the time. Big two smokers call that a power band. These ones are pretty wide and very shallow. Not really a peak, more like a hump.
I also decided to use rear shocks from a 72 Kawasaki 100 enduro, because they were the right height, at 13 inches, and they were originally mounted at the rear axle, not halfway up the swing arm. I will get some pictures as soon as I get some damn parts.
Have fun and be safe. Dave
 
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