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XV1100 Swap to 920R

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XV1100 Swap to 920R

PostAuthor: ttfraz » Wed Apr 22, 2020 8:14 am

I know this has bee documented here and other various forums, but as the search function is lacking I figured it would be easier to make a post about that way I can also get some updated tips from anyone out there.

I have another baby on the way this summer, figuring as I won’t have as much time to ride as will to wrench I figured no time is better than now to start the swap I’ve wanted to do for a while. I have an 81’ 920R I’ve had for a few years now. I also have an extra 89’ XV1100 motor sitting around, so hey why not have a little fun.
I’ve torn and rebuilt many engines including the 920, now when it comes to modify I’m typically a little more hesitant and haven’t done much hence this post.
So here’s what I’ve gather I’ll need for the swap
From the 1100: Crankshaft, Conrods, Pistons, and Cylinders are obvious. Anything else?

Also I’ve tried searching but I can’t seem to find, I thought ive heard the oil pump on the 1100 is superior? Is this true? If so is it as simple as swapping the pump?
Also I can’t to seem to find the thread about the camshaft lubrication mods, can anyone point me in the right direction?

That’s about what I have planned. If anyone has any tips or additional mods please feel free to let me know. Of course I’d like to add performance, but without risking reliability to much. Once I get going on the project and have a bit of meat to write about I’ll start a new build thread perhaps.
Last edited by Jake on Wed Apr 22, 2020 8:20 am, edited 2 times in total.
Reason: Moved to Motor Swap, shadow copy in 920R/TR1 Topic edited to reflect swap.

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Re: XV1100 Swap to 920R

PostAuthor: Hellgate » Wed Apr 22, 2020 8:50 am

For searching the Forum use Google and include the term Virago Tech Forum, then what you are looking for.

As for the project, I've done the conversation as has Nanno, Greg.

For the conversation the are a number of configurations you can build. Nanno uses OEM parts in various combinations, I used aftermarket performance parts.

I bought my pistons, cams, and a few bits here: https://www.pacificcoaststar.com/pcs/v- ... rmance.htm

What are you thinking of?
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Re: XV1100 Swap to 920R

PostAuthor: nanno » Wed Apr 22, 2020 9:03 am

Careful Mr. Hellgate,

whether we are talking XV1100 or XVS1100.

In case of the XV920 you will always have to bore out the cases as the liners on both are thicker than the 920 liners. Other than that, an XV1100 (Virago) conversion is straight forward as all parts fit. If you want to go with XVS1100, I may refer you to my engine build threads (or my blog for the same matter), as you will have to modify the camchain-tensioners as the camchain blades on the V-star models are thicker and the camchain is different.

Also this would be the perfect opportunity to fit a set of XV700 heads to bump up the compression combined with smaller valves, which also helps low-end grunt.

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: XV1100 Swap to 920R

PostAuthor: ttfraz » Wed Apr 22, 2020 9:13 am

Hellgate, looks like the link you mentioned is for V Star parts. I’ll most likely stick with the XV1100 as I have the extra motor already. I was in aware the 920 would have to be bored out though. Thanks for the heads up.
Nanno is there a difference between the 700 and 750 heads? I have a friend I could easily “borrow” some 750 heads from.
As for the searching goes I’ve tried to find the lube mod just can’t seem to find it wether using the stickied search option or through google.

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Re: XV1100 Swap to 920R

PostAuthor: nanno » Wed Apr 22, 2020 3:54 pm

The 700 heads have a squish ring and generally come equipped with the fully hardened rockers whereas the 750ies usually only have the hard-chromed rockers. If you can get 750 heads and they come with good cams and rockers, the benefits are neglible. It's just generally more likely to get good 700 than 750 heads, if you can't dig into them before buying. Hence is why I tend to recommend 700 heads.
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: XV1100 Swap to 920R

PostAuthor: ttfraz » Wed Apr 22, 2020 9:06 pm

Awesome thanks

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Re: XV1100 Swap to 920R

PostAuthor: Hellgate » Thu Apr 23, 2020 6:32 pm

XVS has minimal differences from the XV. Cam tensioners are easily modified. The displacement is the same 1063cc. In my opinion, for what it's worth, the XVS is a better performance value. It all depends on which path you want to follow.
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Re: XV1100 Swap to 920R

PostAuthor: nanno » Fri Apr 24, 2020 8:09 am

I am currently in the midst of a long-term test of combining the heavy XV crank, with lighter XVS rotating bits (pistons, conrods and cylinders) but also have to admit, I like a torque-oriented engine better than the somewhat more "light-footed" XVS.

But in all honesty: go with what you have, both are a notable improvement over stock.
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: XV1100 Swap to 920R

PostAuthor: ttfraz » Tue Apr 28, 2020 10:17 pm

Would the xvs pistons fit in the xv1100? I might be interested in picking up some v star crank rods and pistons without using also having to buy cylinders. At that point I might as well buy a whole motor

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Re: XV1100 Swap to 920R

PostAuthor: ttfraz » Tue Apr 28, 2020 10:20 pm

Actually on second thought I shouldn’t need the crank. Just the rods and pistons if the cylinders work

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Re: XV1100 Swap to 920R

PostAuthor: nanno » Wed Apr 29, 2020 3:21 am

I dubbed it bumblebee, but you can run a heavy XV1100 crank with XVS conrods, pistons and cylinders. You can also install XVS cylinder on XV1100 cases, but you have to bore them, because the liners are thicker. Running XVS pistons in XV cylinders makes little to no sense, as the XV1100 stuff is usually worn or bored close to the limit. Also XVS cylinders are Nikasil-plated for better wear-resistance.
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: XV1100 Swap to 920R

PostAuthor: ttfraz » Wed Apr 29, 2020 6:10 am

Gotcha. I guess we’ll see what the spec looks like on the xv1100 when I start digging it. If everything is good enough I’ll probably stick the those parts at least for now.
Anyone remember that lubrication mod? Still can’t seem to find it

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Re: XV1100 Swap to 920R

PostAuthor: nanno » Wed Apr 29, 2020 1:05 pm

You mean make sure your union bolt has got a decent size hole? (2.0mm IIRC)

XV1100 oversize pistons are still readily available. Your stuff would have to be very, very worn to not warrant an overhaul.
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

*Look to my profile for a link to my blog*
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Sex: Male



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