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78 dt175 top end question

12 Feb 2020 21:57
Nitroxjunkiex
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78 dt175 top end question #1
I'm in the process of doing a top end rebuild on my dt175, I found d some rough spots where the cylinder liner meets the cylinder in the transfer port. Not sure if they just look like this or if I should be worried about it. Thank you.
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13 Feb 2020 13:57
RT325
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78 dt175 top end question #2
Hi, my thoughts are don't worry about it. if it was going good before then it can only go sharper with a new piston & rings or rebore. They all look pretty rough when you look close. & performance guys would clean it all up for sure but all depends what the final aim is [just freshen up].
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13 Feb 2020 14:45
MarkT
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78 dt175 top end question #3
I'm not sure what you mean by "rough"? Maybe my eyes but looks pretty normal to me. And I think you had a video where you rode it right from your house down some dirt roads with some great desert scenery? Looked and sounded like it ran pretty good if it's the video I remember.

:likey

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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14 Feb 2020 10:34
Nitroxjunkiex
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78 dt175 top end question #4
That was kinda my thoughts on it, I had a buddy point it out so I figured I'd ask you guys. And yes, that was me in the desert when I first got it. Thank you!

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14 Feb 2020 10:48
Nitroxjunkiex
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78 dt175 top end question #5
I'm probably going to do new piston, rings, and reed valves. I'm going for reliability over power. I'm pretty much going for a cool vintage trail machine that I can ride on the road if i have to.

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14 Feb 2020 14:29
FrankC
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78 dt175 top end question #6
The 175's are great machines. I rode an older one to college. I believe it had an orange tank. There again it might have been a 125. My memory is going.

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14 Feb 2020 15:12
MarkT
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78 dt175 top end question #7
175 is arguably the best enduro Yamaha ever made... one of the most fun anyway... Lightweight with better power to weight ratio than some of the larger bikes. I think the 250cc AMA National Championship was won by a Yamaha 175 back in the 1970's... Larry Shoemaker from International Cycle was the rider if I remember right.

Only drawback is when it was new a VW bug could barely do 65 mph... now any new econo-car can cruise at 80+ no problem... so not as good on the highway these days with the higher speeds we drive.

Might be the longest model run too... From 1969 into the 2000's (at least) in many parts of the world. Might even be available new today in some country someplace.

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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