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Old 12-30-2010, 06:31 PM   #11
44dwarf
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As it's short and was just to adapt to a large carb, I'd say it was just that an adapter. However it also increases the volume between the carb slide and the piston skirt. Volume equals Mass...moving Mass equals Force.. Force equals better crank case filling sort of like the expansion chamber. Kinda like a tunnel ram intake on a drag car.
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Old 12-31-2010, 06:46 PM   #12
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Dave,

Try Gabe Trench for a cylinder. He has all of my old parts.

Question to all....any idea if this is a DT-1 Gyt head?

Thanks!



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Old 12-31-2010, 07:08 PM   #13
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[quote=at1guy;103296]Dave,

Try Gabe Trench for a cylinder. He has all of my old parts.

Question to all....any idea if this is a DT-1 Gyt head?

Thanks!



/quote]

Yes, it's either a 1969 GYT kit head, or a 70/71 DT1mx head.

The way to tell which it is ... 70/71 heads had a polished outer left fin ... the 69 outer fin was just left as raw casting.
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Last edited by Enduronut : 01-03-2011 at 12:41 AM.
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Old 01-24-2011, 11:32 AM   #14
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Quote:
Originally Posted by Enduronut View Post
The numbers are normally found on the mounting flange for these DT1's carbs ... yours may be a non-Yamaha Mikuni ... without the stampings.

Appears you have a real mx motor there ... w/close ratio gear box.



.

.
Enduronut after some very careful sanding with a scuff pad I have found the same numbers on my carb that you have shown here in this pic.
Is this a 125 or a 250 carb?
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Old 01-24-2011, 01:12 PM   #15
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.

It's a DT1/250 carb

.

.
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Old 02-04-2017, 12:03 PM   #16
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Maybe the forum can help.

I building a CT1 for MX. A forum member brought this thread to my attention about a carburetor question I posted. A great idea.

I picked up a Kennedy AT1 aftermarket adapter. Well, it was listed as as a Yamaha AT1. Along with a 34mm RT1M carb, #284.

Went to install. Didn't fit. Bottom of carburetor hits top of case. About 5/16" off.

I'm kinda thinking the adapter may be for a different brand of bike. I hope not.

Anyone have any ideas or experience on how to modify or make this setup work?

Maybe machine the adapter to a different angle? To tilt the carburetor a couple more degrees for clearance. If so, how much tilt would be ok?

Any input would be greatly appreciated,

Rick




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Old 02-04-2017, 02:15 PM   #17
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Could be the shape of the bowl on that carb. is your problem. Go to Sudco's site and check carb. dimensions. A different carb. may cure all your problems.
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Old 02-04-2017, 02:49 PM   #18
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.

It's a lot of work, but here's another option . . . if you're set on using that #284 carb

Rebuild the crankshaft with a 110mm rod, and then install a spacer that will bring your squish number back to where you currently have it set. (probably about 4+ mm and the two gaskets). You may also have to notch the bottom center of the sleeves to allow for some extra rod clearance.

I suspect most people reading this are scratching their head about now!

.
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Old 02-04-2017, 04:03 PM   #19
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Quote:
Originally Posted by Enduronut View Post
.

It's a lot of work, but here's another option . . . if you're set on using that #284 carb

.
No, I'm not locked in on using the #284 carb. The adapter and carb were just suggested. Apparently, this setup isn't going to work.

Originally I was looking for a 26mm AT1M carb to bolt on.

I'm open to any suggestions. If any one is racing AT1/CT1 bikes I would like to know what carburetor and jetting your using.

1970 CT1
CR transmission
Torque engineering exhaust
Mild porting and head work

Thanks,

Rick
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Old 02-04-2017, 04:47 PM   #20
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If you go on one of the parts sites you can find what other bowl gaskets may fit the 284 carb body. As said earlier maybe their is a bowl that may fit the carb that is not as tall.
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