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Makotosun

can it be done? 78+ cylinder on 74 DT175

  • TDHoward
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can it be done? 78+ cylinder on 74 DT175 was created by TDHoward

Basically can it be done?
What needs to be modified?
I see lots of "Cylinder kits" for 78 forward bikes, but seems like jugs for DT175 A-B-C are rare as hens teeth.
I realize the newer style has a 6 bolt head, but seems like the jug is essentially the same with 4 studs down.

I guess I'm asking whether I can buy an entirely new top end, Or am I stuck tracking down parts for an overbore?
TIA
29 Jan 2021 09:09 #1

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Replied by RT325 on topic can it be done? 78+ cylinder on 74 DT175

Short answer No. Compare base gaskets & stud hole spacing in links below.

www.partzilla.com/catalog/yamaha/motorcy...a/crankcase-cylinder
www.partzilla.com/catalog/yamaha/motorcy...e/crankcase-cylinder
29 Jan 2021 11:39 #2

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Replied by MarkT on topic can it be done? 78+ cylinder on 74 DT175

Anything "can" be done with enough time and money. As RT325 implied, it certainly would not be a simple swap... aluminum welding and precision machine work would be required.

The other thing is the later cylinder kits I've seen are cheap copies and likely of dubious quality. I wouldn't even use one on a 78 on unless I was really desperate.
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
29 Jan 2021 12:18 #3

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Replied by MarkT on topic can it be done? 78+ cylinder on 74 DT175

One more thing... the earlier CT2 and CT3 will bolt on. You probably would want a matching CT head too as the fin shape changed in 74.

1976 cylinder is also a little different... no longer has the oil injection port at the base of the cylinder as port was moved to carb. Head shape changed a little too I think so again if going with 1976 you might want a matching head.

74-75 cylinder and head are the same.

Getting yours bored is likely the best option. Enduronut can help you if you have trouble finding a piston kit.
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
29 Jan 2021 12:27 #4

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