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Old 01-30-2019, 10:01 AM
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Default 1982 YZ490 build

     

I just acquired a 1982 Yamaha YZ490 and looking for the modifications that make the bike what the factory should have made it. Engine, suspension, carburation etc. Any help would be appreciated as I am taking this beast down to the frame as we speak.

Thanks in advance.
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Old 01-31-2019, 06:15 AM
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You can find some info here.
VINTAGE YZ INFO
Try a google search for 1982 Yamaha YZ490 wrench reports. If you can get your hands on those, it will give you the performance improvements you are looking for.
Also look for old magazine articles featuring this bike. Ebay is a great resource for these and parts.
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Old 01-31-2019, 12:34 PM
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As you do the tear down take a lot of photos including close ups of each assembly, especially the bearings and seals, before disassembly.I use an Ipad mini.Then use plastic sandwich bags to keep components and bolts together and use a marker to write the assembly name on each bag.

Also, go online to your favorite Yamaha dealer and look at the fiche diagrams for specific details.
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