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1981/83 XV750 Flywheel/rotor interchange

This area is for sharing Maintenance Procedures & Information related to the Yamaha Virago Electrical System.

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Rob402
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1981/83 XV750 Flywheel/rotor interchange

Post by Rob402 » Sun Aug 18, 2019 7:54 am

Hiya, I recently picked up an 81 and an 83 750 viragos but the flywheel/rotors and starters are missing. Seems the original parts are no longer available,,,, any idea what if any of the newer 750 parts will work?

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ViragoJoe
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Re: 1981/83 XV750 Flywheel/rotor interchange

Post by ViragoJoe » Sun Aug 18, 2019 10:07 am

Rob402 wrote:
Sun Aug 18, 2019 7:54 am
Hiya, I recently picked up an 81 and an 83 750 viragos but the flywheel/rotors and starters are missing. Seems the original parts are no longer available,,,, any idea what if any of the newer 750 parts will work?
Rob,

Starter is available: Same starter for both model years.
https://www.ebay.com/itm/NEW-STARTER-19 ... 2341262635

Flywheel not that prevalent.
A lot of Virago parts are interchangeable, but not sure a flywheel is one of them. A significant amount of research would be necessary to determine that. Both model Years use the Same Flywheel (4X7-81450-21-00).
ViragoJoe
1996 XV1100SH Virago Special
"Never ride faster than your Guardian Angel can fly!!"
;)

Rob402
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Re: 1981/83 XV750 Flywheel/rotor interchange

Post by Rob402 » Sun Aug 18, 2019 10:13 am

Thanks for the starter info,,, as far as flywheel/rotor interchange, any idea who may have such info. I tried yamaha and didnt see the part number superceded and kinda short on ideas as to how I could find out short of trying to get a newer 750/920 rotor and fitting it :( :(

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ViragoJoe
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What Virago you Own: 1996 Virago Special XV1100SH
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Re: 1981/83 XV750 Flywheel/rotor interchange

Post by ViragoJoe » Sun Aug 18, 2019 10:44 am

Rob402 wrote:
Sun Aug 18, 2019 10:13 am
Thanks for the starter info,,, as far as flywheel/rotor interchange, any idea who may have such info. I tried yamaha and didnt see the part number superceded and kinda short on ideas as to how I could find out short of trying to get a newer 750/920 rotor and fitting it :( :(
Rob,

Going with a newer 750/920 may be your only alternative.

Yamaha has made several flavors of Virago's from their birth. In addition, although the bikes cosmetically look the same in their flavor (Engine cc's) the internals can be significantly different from year to year. This is why when one talks about a Virago (No matter what cc) the Model Year is so important.

To answer you question: as far as flywheel/rotor interchange, any idea who may have such info.?

If I had that information, I would have provided it. Sorry to say, I do not have it. That is why a significant amount of research would be necessary to determine what will work or even possible..
ViragoJoe
1996 XV1100SH Virago Special
"Never ride faster than your Guardian Angel can fly!!"
;)

Rob402
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Re: 1981/83 XV750 Flywheel/rotor interchange

Post by Rob402 » Sun Aug 18, 2019 11:08 am

Yes it seems so,, I have been a mechanic for 35 years, built lots of bikes in the past but my first go at a virago. I may end up with a newer engine swap, but first want to explore the early engine. Hard to find parts locally but if I can find an 84 to 91ish flywheel/rotor I may just give it a whirl and see what happens. I appreciate any and all info, so thanks again 😀

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ViragoJoe
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Re: 1981/83 XV750 Flywheel/rotor interchange

Post by ViragoJoe » Sun Aug 18, 2019 11:39 am

Rob402 wrote:
Sun Aug 18, 2019 11:08 am
Yes it seems so,, I have been a mechanic for 35 years, built lots of bikes in the past but my first go at a virago. I may end up with a newer engine swap, but first want to explore the early engine. Hard to find parts locally but if I can find an 84 to 91ish flywheel/rotor I may just give it a whirl and see what happens. I appreciate any and all info, so thanks again 😀
Good luck with your endeavor to get these old girls back up and running.

Keep us posted on your progress. I know other 1981/83 Virago XV750 owners would be interest too.

If we come across anything that may assist you. We will let you know.
ViragoJoe
1996 XV1100SH Virago Special
"Never ride faster than your Guardian Angel can fly!!"
;)

Rob402
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Re: 1981/83 XV750 Flywheel/rotor interchange

Post by Rob402 » Sun Aug 18, 2019 12:22 pm

Thanks again,, I will try a few variations and let you know how it works out,, worse case is an updated engine, but I do enjoy a challenge lol and will try the old one first

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ViragoJoe
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Re: 1981/83 XV750 Flywheel/rotor interchange

Post by ViragoJoe » Sun Aug 18, 2019 2:29 pm

Rob402 wrote:
Sun Aug 18, 2019 12:22 pm
Thanks again,, I will try a few variations and let you know how it works out,, worse case is an updated engine, but I do enjoy a challenge lol and will try the old one first
Rob,

Depending on what engine you may think about utilizing if you decide to go with a different engine. Pay attention to what you are going to place in the bike. Any 75° Virago Engine should bolt right up without an issue.

The big problem you will encounter is the wiring harness in the recipient bike of the newer engine. Say you are lucky enough to get an 1996 XV1100 and want to place it in one of those bikes.

It needs a wiring harness for the fuel pump it has and a relay that controls it. The TCI pick up coil at the flywheel is a single coil.
Your XV750's have a dual pick up coil at the flywheel and are equipped with a CDI.

CDI = Capacitor Discharge Ignition.

Later bikes are:
TCI = Transistor Controlled Ignition.


Virago Ignition Systems:
https://www.viragohelp.com/virago-ignition-systems/

Virago Fuel Systems:
https://www.viragohelp.com/virago-fuel-systems/

Also XV 1000’s and 1100’s have a “pressure sensor” input to the TCI that 700’s, 750’s, and 920’s don’t have.

In summary, whatever engine you decide to go with as a replacement. Make sure your older bikes wiring harness will support it or have a bonafide work around. As I mentioned earlier from year to year these bikes are different. !981 through 1983 were First Generation Virago's everything there after is Second Generation Virago's from 1984 until end of production in 1999. With upgrades in between from year to year.

So, do the needed research to get it right.
ViragoJoe
1996 XV1100SH Virago Special
"Never ride faster than your Guardian Angel can fly!!"
;)

Rob402
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Re: 1981/83 XV750 Flywheel/rotor interchange

Post by Rob402 » Mon Aug 19, 2019 9:08 am

Good morning, just found an 84 1000 parts bike, complete less a few covers, guy also has an extra 750 engine with a serial number only a few off my bikes engine so may have lucked out. Woohoo. Regardless I just may be able to resurrect a couple of these sweet old girls. Again thanks so much for all the help :D

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ViragoJoe
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Re: 1981/83 XV750 Flywheel/rotor interchange

Post by ViragoJoe » Mon Aug 19, 2019 10:43 am

Rob402 wrote:
Mon Aug 19, 2019 9:08 am
Good morning, just found an 84 1000 parts bike, complete less a few covers, guy also has an extra 750 engine with a serial number only a few off my bikes engine so may have lucked out. Woohoo. Regardless I just may be able to resurrect a couple of these sweet old girls. Again thanks so much for all the help :D
Sweet!!

Glad it is working out for you Rob!
ViragoJoe
1996 XV1100SH Virago Special
"Never ride faster than your Guardian Angel can fly!!"
;)

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