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Makotosun

68 DT1 idle adjustment

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Replied by Enduronut on topic 68 DT1 idle adjustment

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Yes, the M1 is a 68 (30mm) GYT kit carb
The standard carb was a 26mm
The "star" mark indicates that it's a government inspected part!

You might be able to trade your gyt carb for a standard carb if you desire . . . I'm sure somebody would take you up on that!!

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Control your thoughts . . . or your thoughts will control you!.!
Don't aim . . . and you'll hit your target every time!
A wise man knows . . . he isn't!
Failure squared . . . equals success!
The following user(s) Liked this Post: swm, nhsteve, Ht1kid, Pedalcrazy
Last edit: 06 Jun 2022 16:53 by Enduronut.
06 Jun 2022 16:50 #11

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Replied by Pedalcrazy on topic 68 DT1 idle adjustment

Man thanks Dave! These bikes have more secrets apparently. Bought from two different states about 4 weeks apart. I wonder what the motors themselves will tell on the inside? Both GYT heads and now carbs. One bike had an expansion chamber on it and the owner of 35 years said it used to scream. I paid up good money for NOS stock 68 heads for the bikes as I usually put them back to stock. Now I don't know. One bike had the 21" front wheel and you could tell it had been respoked because the fellow crossed the spokes a different way on the stock hub and you could tell how they were installed originally. The rim was rusted and crusty so just kept the hub and will respoke to the stock 19 inch.
1978 DT400E
1976 DT400C
1973 RT3
1971 RT1B
1968 DT1 (3)
06 Jun 2022 17:01 #12

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Replied by Pedalcrazy on topic 68 DT1 idle adjustment

I forgot I bought a spare carb last fall after I got the bikes. I figured I might need a replacement or for parts. Also a top idle adjust model. It has “214” and “E3” with a star. I held up the E3 next to the M1 and looked through them. I see the difference in inner diameter. Thanks again for the expert information!
1978 DT400E
1976 DT400C
1973 RT3
1971 RT1B
1968 DT1 (3)
06 Jun 2022 17:42 #13

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Replied by MarkT on topic 68 DT1 idle adjustment

30 is the venturi diameter...  basically slightly bigger bore than enduro carb.  Externally carb can be identical.

The AT MX carb was the same thing...  looks like Enduro version with bigger bore and different jets.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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06 Jun 2022 18:24 #14

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Replied by MarkT on topic 68 DT1 idle adjustment

Sorry, way late.  Didn't hit the post button.  LOL.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
06 Jun 2022 18:35 #15

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Replied by Pedalcrazy on topic 68 DT1 idle adjustment

Thanks Mark T. Never too late. After working on 360 and 400 bikes the last few years and then looking at the M1 it seemed pretty normal. After looking through the M1 and comparing to the 26 MM one…that stock carb looks really small! I was glad the outside diameter of both are the same so no worries about the stock air box tube fitting.  Whatever way I decide to restore…either carb will work.  Thanks all!
1978 DT400E
1976 DT400C
1973 RT3
1971 RT1B
1968 DT1 (3)
06 Jun 2022 19:33 #16

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Replied by JGersh on topic 68 DT1 idle adjustment

Here’s the GYT Kit pages from my ‘68 DT1 Service Manual. They detail many things including carb conversion and jetting set up.

 

 

 

 

 
2 - ‘68 DT1
‘70 RT1
‘70 CT1-B
2 - ‘70 HT-1’s
‘12 Triumph Scrambler
The following user(s) Liked this Post: Snglsmkr, nhsteve, Ht1kid, Pedalcrazy
Last edit: 07 Jun 2022 10:55 by JGersh.
07 Jun 2022 06:48 #17

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Replied by nhsteve on topic 68 DT1 idle adjustment

Nice info, thanks for posting!! 

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09 Jun 2022 07:58 #18

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Replied by RO9993 on topic 68 DT1 idle adjustment

A new GYT carb for the early DT1's  part # 214-1401-70 just sold on Jpan ebay for 60500yen  (AU$600). A Unicorn  :)
22 Dec 2024 18:00 #19

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