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1981 Yamaha DT175

15 Sep 2020 13:09
Smartlu57
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1981 Yamaha DT175 #1
Hello,

I am looking for a little help or guidance. I'm working on rebuilding and restoring my childhood DT175. I recently just finished getting the motor running after replacing crank bearings and new pistons and rings. It started after 2 kicks so all good there. The issue I have is that it seems to have a messed up shift pattern, however I never took the actual gears in the transmission apart so I wondering what I have done wrong here when I reinstalled the transmission.

Thank you everyone in advance and glad to see so many people keeping these old bikes running!

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15 Sep 2020 17:09
MarkT
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1981 Yamaha DT175 #2
Welcome!

Nice story.

Need specific details on exactly what the problem is. I can't imagine how you could have messed up the shift pattern.

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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16 Sep 2020 19:22
Smartlu57
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1981 Yamaha DT175 #3
I apologize I can’t be more specific but I think you answered my question. I installed the transmission exactly how it came out but the shift Forks came off when I split the case but I assume they only go in 1 way but could really be in any gear. So it’s very staring that I have a weird shift pattern where neutral is where 3rd usually is and it’s down 3 then back up to 4. I’m going to split the case again and try it again.

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16 Sep 2020 20:05
MarkT
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1981 Yamaha DT175 #4
That's a lot more specific than "weird shift pattern" :likey

Not sure I understand you completely though... it's a shift drum... completely linear. If you're in a gear and you move the lever down three and then back up one it's exactly the same as going down two from where you started. Impossible to be anything else. So that's probably not what you're saying.

Neutral is NOT a "gear"... it's just a "half shift" that puts the trans between gears... not handled internally.

Before splitting, check the alignment marks on the shift drum sector. It's in the manual. You can put the sector piece on with the pins 180 degrees out which could put neutral in the wrong place. Easy fix.










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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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17 Sep 2020 08:52
Smartlu57
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1981 Yamaha DT175 #5
Thanks Mark, I'll give that a try/look over before I get to deep.

I appreciate the help!
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