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YSR80 Piston and Motor Question

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podman
L Plate Warrior



Joined: 19 Nov 2020
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PostPosted: 08:08 - 20 Nov 2020    Post subject: YSR80 Piston and Motor Question Reply with quote
Morning all, new to the forum and rebuilding my YSR80 at the moment.

Can anyone clarify if these motors are basically RD/DT80MX motors?

Reason I ask is I need a re-bore and after doing some searching, the part Nos for the YSR and DT pistons are different. Any key differences I should be aware of?

Thanks in advance.
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sickpup
Old Timer



Joined: 21 Apr 2004
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PostPosted: 09:41 - 20 Nov 2020    Post subject: Reply with quote
diameter, pin size, rings, piston timing, just a few things and no doubt more. Thumbs Up
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steve the grease
Crazy Courier



Joined: 26 Jan 2018
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PostPosted: 12:24 - 20 Nov 2020    Post subject: Reply with quote
cmsnl.com have these exploded parts diagrams which are an absolutely fantastic resource for people in your position. You can compare different parts all day.

https://www.cmsnl.com/yamaha-ysr80-1988-3cr1-europe-283cr-300e1_model37552/partslist/

https://www.cmsnl.com/yamaha-rd80-1982-12g-europe-2212g-300e1_model35858/partslist/

It's a very useful resource
____________________
All the above is my personal opinion, you can see my lips move, but I'm talking out of my arse.
I've been riding, and fixing , bikes for 50 years, in that time the more I learn, the less I am absolutely sure of.....
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