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Advice

  • kmarkor
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  This bike hasn’t been touched in 20 years, and was probably never serviced. I think a new piston and rings are in order, the rust on the rod seems a bit concerning. Any advice would be helpful. This is from a 1970 Yamaha ht1 90cc. I’m pretty much learning as I go, YouTube and this website have been a lifesaver!
Last edit: 09 May 2022 20:39 by kmarkor. Reason: Forgot pictures
09 May 2022 20:38 #1

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Replied by MarkT on topic Advice

Is rod actually rusty?  No too common to see that.  Might just be copper cladding used to heat treat properly?
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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09 May 2022 21:18 #2

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Replied by Ht1kid on topic Advice

I Agree with MarkT on the copper how many miles on your bike any more pictures and questions?
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09 May 2022 22:11 #3

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Replied by shyted on topic Advice

I agree too. It's a treated surface so quite resistant to corrosion.
The ignition side web on the crank is dry looking and surface corrosion on that but that's quite normal on motors that have been stood.
The HT1 is very sensitive to compression loss, so be sure to check the bore. Run your fingernail over any tram lines that are probably present and if you can feel them then re bore it.
You will probably find the rings have gummed up and are stuck back in the lands hence the marks.
I put an MX 100 rod in mine as the lubrication cut outs are much better and it's lighter.
10 May 2022 02:39 #4

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