Need simple 2 stroke ideas

We currently have a kt100 stock appearing.
Can keep up with the sudams.

We need 2 cycle ideas that wont cost a fortune. Dirt bike engines or kart engines. Looking for 30+ HP.

Just a fun class at our local track. No rules. Just has to be a 2 stroke. Small track, so 100hp isn't needed, but 20 HP doesnt keep up.
 
I’d go with a 116. Get a nice weight break if you’re using UAS weight rules and if you’re on the lighter side. In the ballpark of a hearty 29-34 HP. I’ve been led to believe there’s many 116 rotaries, reedjets and TT75’s sitting on shelves because I’ve managed to pick up two 116cc motors in the past two months for relatively cheap.
 
You could run dual Yamaha's. Setup properly they produce smooth strong power for a smaller track.Have Birky build you a dual clutch and hook them together through that and you can set them up 180*off or straight up depending on your driving preferences.
 
Great info guys. I don't wanna go 2) engines, and I like the idea of water cooled.... I have a younger driver who isn't good at carb adjusting on the fly......
 

Ted Hamilton

helmet painter and racer
YZ-144.....use an Eric Gorr kit ported for midrange. I'm planning on doing a similar package. Got the kart, looking for the motor now...
 

Yakattack

Member
I am running a yz125/EG 144, ported mid to top...
I run with a lot of big bore/stroked Animals on Alky...
At 50lbs overweight...No problem getting the job done...
But, I converted mine to a Jackshaft 2-1 gear reduction...through the cases...
Bully 3 disc comes in at 4000rpm...electric water pump on speed controller...

Fun little engine... easy to get parts...
I was running a Yz250f bored and stroked... but for my home track it was too much...
 
I have 3 leopard tag engines, will make 30+ h/p.. 2 are complete, 1 is in box, (new parts). 1000.00. these engines are h20, will include new big alum. radiator, pipes, motor mount, ignitions, carbs, clutchs, carbs need new skins, have kits, will include.
 

Hoppy

Member
You could run dual Yamaha's. Setup properly they produce smooth strong power for a smaller track.Have Birky build you a dual clutch and hook them together through that and you can set them up 180*off or straight up depending on your driving preferences.
I think he mentioned "that won't cost a fortune". Dual Yami's with a Birkey isn't a cheap set up. But they are cool! Hard to beat a 116. Lots of them around and speedy for the price.
 
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RDub3

Member
If you could pick up a tag engine for cheap that would do the trick. Especially if you put it on methanol, but even on gas you're looking 28-32hp depending on the engine.
 
tag engines make good opens, built a bunch of them. the leopards have the same port shape as a tt75.. Sudam piston, dual ally carbs, ported/head work.. I can build the ones I have for sale....
 
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I think he mentioned "that won't cost a fortune". Dual Yami's with a Birkey isn't a cheap set up. But they are cool! Hard to beat a 116. Lots of them around and speedy for the price.
Actually, my twin stock Yammi setup was the cheapest around and very much fun! Just ask the guys here in the OVUAS, especially Justin. Ran 2nd to him on a small bull ring. Got the video to prove it! Now, a big, long track would be a different story.

The Birky clutch would be a few $$$. I ran a 3 & 4 disc Bully with no issues.

Brian #89
 

racer223

Member
I agree with Mike. The Leopard cylinder is great, however the X30 cylinder very much resembles the Parilla Sudam of old. They make a tremendous amount of HP even on gas. I had Al Eshman build me two. Leopard bottom ends and X30 cylinders, I haven't had a chance to run them yet, but I believe it will be a potent combination once I have it sorted out. And it did not cost and arm and a leg to put together. I found broken X30 cylinders and heads from builders with customers running SKUSA type stuff. And there are some good finds as far as lepard bottom ends out there. Good luck and if you have any questions I would be more than happy to answer them.
 

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