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1980 YZ100 G

27 Mar 2020 06:06
Daytona955
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1980 YZ100 G #1
Hi all, new to this forum. I just got a complete YZ100G off a friend. My son and I are going to restore it. While I am ok at basic mechanics there are some aspects of the bike I would like to know. Basically it is for ordering parts as the bike is a little rare here in Oz. Does the 100 share much with the 125 of the same year and is it the same machine as a 79 model 100? Any help appreciated guys. Cheers

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27 Mar 2020 06:27
yamahahaha
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1980 YZ100 G #2

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27 Mar 2020 07:00
Gr8uncleal
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1980 YZ100 G #3

yamahahaha wrote: This should get you jump started

www.cmsnl.com/yamaha-yz100-competition-1...tslist/#.Xn3-p3JKjIU


+1

Unfortunately, with the links to the CMSNL website, they only take you to the front page.

Select on Yamaha, then use the dropdown for YZ, then select your model.

If you select an actual part, then scroll down the page and it will show what other models used that part. The Partzilla website does the same thing.

Please note, however, that for that era, CMSNL is very US model orientated. Partzilla, I think, is US models only.

Some of the manuals in the Tech Library here might prove useful (see toolbar above) and we have a few members from "down under" who will chip in to help.

Oh, and Welcome! from the UK!

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27 Mar 2020 16:02
RT325
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1980 YZ100 G #4
Just specifications here but i see they're 50x50 bore & stroke so have to be careful buying a piston as normal yamy 100 trails etc are 52x46 bore & stroke. Actualy working on 'that' theory a 125D E F cylinder might fit as think they're all 56x50, [but things to consider of course] 125G went back to front motor with RH drive & RH cdi mag. but up to "79 125 [maybe],

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28 Mar 2020 02:11
Daytona955
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1980 YZ100 G #5
Cheers thanks for that link. Stripped the bike down and now will begin motor. It looks pretty simple, but that’s always the case hahahaha

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