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Makotosun

81 DT175 top end on 73 175 bottom end.

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81 DT175 top end on 73 175 bottom end. was created by Youngdrakeo

Quick question.
Can you fit the later model DT175 top end with the 6 bolt head onto a early CT bottom end?

I am building up a 73 AG175 motor. Same as the ct3. Slightly less aggressive porting I think.

I have a 74 dt175 top end to put on it. Has the 4 bolt head with the single plug.
Apposed to the double plug.

Any major differences from 74 Dt top end to the 81? Apart from been 6 bolt.


Cheers!
73 CT3 modified, 74 AG175 MX, 79 YB100 x2 , 79 GT 80 ,2015 ducati scrambler ,honda CT70
Last edit: 10 Mar 2020 23:46 by Youngdrakeo.
10 Mar 2020 22:23 #1

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Replied by Youngdrakeo on topic 81 DT175 top end on 73 175 bottom end.


Good point I didn't think about the 81 exhuast port angle
73 CT3 modified, 74 AG175 MX, 79 YB100 x2 , 79 GT 80 ,2015 ducati scrambler ,honda CT70
11 Mar 2020 01:14 #2

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Replied by RT325 on topic 81 DT175 top end on 73 175 bottom end.

No, bolts down different. Check the base gasket between the two. That's always a good indication. Bigger base of the cylinder with studs further out & larger transfers. Think the base studs are 10mm instead of 8mm too by memory.
www.partzilla.com/catalog/yamaha/motorcy...linder-head-cylinder
www.partzilla.com/catalog/yamaha/motorcy...3/crankcase-cylinder
Last edit: 11 Mar 2020 04:28 by RT325.
11 Mar 2020 03:53 #3

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Replied by MarkT on topic 81 DT175 top end on 73 175 bottom end.

Earlier models had 4 "through studs" that clamp the head and cylinder to the cases.

The redesign that started with the monoshock uses 4 short studs to hold the cylinder to the case and six more short studs to hold the head to the cylinder... would require extensive work to make the swap.
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
11 Mar 2020 04:19 #4

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Replied by Youngdrakeo on topic 81 DT175 top end on 73 175 bottom end.

Okay no worries it's a no to that idea then.
I have found a 74 Dt head that will bolt up.
Also have a high comp radial 125 head I might modify to fit the 175.
Thanks guys!
73 CT3 modified, 74 AG175 MX, 79 YB100 x2 , 79 GT 80 ,2015 ducati scrambler ,honda CT70
11 Mar 2020 16:52 #5

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