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Installing 1100CC into a 920CC Virago frame

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Installing 1100CC into a 920CC Virago frame

PostAuthor: Viragolove » Wed May 15, 2019 11:08 am

Hello fellow Virago enthusiasts.

I had an epic engine failure in my 1982 920CC virago and have to swap the engine (attached photo). I wanted to know if anyone had an experience in replacing the 920 with a 1100 CC from 1983. I am working with a mechanic, but I wanted to make sure it could fit in the frame. I want a little more power, but just want too make sure that the frames can hold. Gracias

Thank you in advance and hope you are all ripping!
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Re: Installing 1100CC into a 920CC Virago frame

PostAuthor: bstig60 » Wed May 15, 2019 12:22 pm

Should be no reason 1100 won't fit in your frame. Several had put the 1100 in an early 750 frame.
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Re: Installing 1100CC into a 920CC Virago frame

PostAuthor: nanno » Wed May 15, 2019 2:33 pm

Just a few things to note:
1) if still intact, swap over the rotor and left sidecover from your 920 onto the 1100, so you can stick with the older ignition and don't have to re-wire anything
2) 1983 was prior to the 1100 models, these came out in 1985/86 - so either you've got the year wrong or someone's selling you an XV1000 engine. Easiest identifier: if the covers are flat as they are on your 920 it's a 1000, if they are more rounded and buldged out, 1100.
3) The 1100 has got more torque, but less overall horsepower, but that can be remedied rather easily with a different set of heads (700 or 750).

Cheers,
Greg
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Re: Installing 1100CC into a 920CC Virago frame

PostAuthor: Jake » Wed May 15, 2019 3:25 pm

nanno wrote:Just a few things to note:
1) if still intact, swap over the rotor and left sidecover from your 920 onto the 1100, so you can stick with the older ignition and don't have to re-wire anything


The downside is you're left with the crappy starter system of the 920. To me, it would be worthwhile to do the wiring changes for a much better starter system.

Viragolove wrote: I wanted to know if anyone had an experience in replacing the 920 with a 1100 CC from 1983. I am working with a mechanic, but I wanted to make sure it could fit in the frame.


The engines are the same size, only the displacement differs. Likewise with the 700, 750 and 1000.

Perhaps you mean 1993 and not 1983. As nanno stated, no 1983 1100, only 1986 and later.

"IF" the 1100 is a 1993, then you will have to use the rotor, side cover and starter system from your 920.

"OR" use the complete 1100 engine, "BUT" if the 1100 is a 1991 or newer, you will have to source a TCI for the 1100. The 1991 and later used a single pickup, your 920 uses a dual pickup and the TCIs are not compatible.

One other thing that needs mentioned is, the engine mounts from the 920 have to be used on the 1100 engine in order for it to bolt onto the frame.
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Re: Installing 1100CC into a 920CC Virago frame

PostAuthor: nanno » Thu May 16, 2019 12:22 am

Yes you're right about the starter system. As a Euro-guy I tend to forget about that as we always got the Gen II starter on the 1000s. Of course you can run the 920 ignition in the 1100 sidecover (and for you American guys that might actually be worth the effort, because of the starter), BUT you have to make a spacer on the lathe or look at the 1984/85 XV1000 as that had said spacer underneath the stator (and I think) ignition pickup.

From what I recall the one underneath the rotor can quite easily be made on a lathe, the pickup is a case for a few washers as it is just a tad too far away from the lobes on the rotor.

Cheers,
Greg
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

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Re: Installing 1100CC into a 920CC Virago frame

PostAuthor: mark75 » Thu May 16, 2019 1:59 am

the 1986 to 1997 700s' had a 'spacer' p/n 1RM-81661-00

I don't recall having one on my '86-1100, tho my memory ain't what it used to be. ---> https://www.mrcycles.com/oemparts/a/yam ... /generator

here's one already mounted on new stator on '85(?) -700
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Re: Installing 1100CC into a 920CC Virago frame

PostAuthor: bstig60 » Thu May 16, 2019 9:03 am

Assuming the new engine is 1993 an 1100, you will need the TCI from the donor bike as the PU coils were changed after 1990 to a single Pick Up. I am aware it is a little effort to redo the wiring to accommodate the new starter system, but it will be well worth it to have the gen 2 starter system.
Bill
"It´s a friggen motorcycle, it´s not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you s**t your pants every now and then. "

Please take the time to edit your profile to show your location. City, State/Province, and Country.
It is easier to help you if we know where you are.


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Re: Installing 1100CC into a 920CC Virago frame

PostAuthor: Viragolove » Thu May 16, 2019 11:09 am

Wow! Thank you everyone for the useful knowledge and am stoked. I am happy to be part of this community. Mucho Gracias mi amigo's and amiga's.
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