Forum Donations
Search
VTF Google Search
 Click Here

questions about xv700 to xv1000 engine swap.

Everything about swapping a motor on your Virago.
  • Advertisement

Post a reply

questions about xv700 to xv1000 engine swap.

PostAuthor: motorlou » Sat Aug 10, 2019 9:52 pm

hey guys just had a question about swapping out a 700 to 1000 engine (both 1985). i want to know the differences in the tci unit. besides timing curves, i read you are supposed to use the pressure sensor from the 1000 along with its cdi. what is this sensor? where is it located. what does it sense?. on the xv1000 tci there are a few extra pins than the xv700. one for the kickstand relay(black/white) then there are red/white, black/red, and black/yellow that go to the said pressure sensor. can the sensor be bypassed? if so how? can an xv1000 tci be used on the 700 or vice versa?

motorlou
Junior Membership
Junior Membership
 
Posts: 71
Joined: Sat Sep 01, 2018 11:49 pm
  Flag
Bike year & model: 1985 virago xv700 and 1985 virago xv1000
Sex: Male

Re: questions about xv700 to xv1000 engine swap.

PostAuthor: Flyingdog » Sun Aug 11, 2019 12:40 am

About the pressure sensor..just another one of those EPA demanded parts, so the bikes could be sold in US..or any other place having emission regulations. It'll be located sitting ontop of the coil cover. During deceleration, it will pull vacuum and retard timing abit. Eliminating some backfiring. IMO: bout as worthless as the MCV/AIS, or any other emission garbage. And..yes..can be eliminated if it don't work or you just don't want it. Some will say it's needed. That's cool, but I say if it is, it's usually to masked something else. But that's just "my" side. Haven't had one on the 1000 since the 80s. Never a problem. I just removed/plug the vacuum hose at the "source" and clip the wire. Been soo long, don't remember how far back I clipped it. Probly at the TCI. If you look at bikes thru out the years, you'll notice how they (Yamaha in this case) kept adding things to eliminate problems pop'n up. Mainly..back fires. All this stuff cropped up, when the "save the earth" movement came to full swing. Think it was around the time hair spray was kill'n the ozone... :bg: Certain years got the MCV, some AIS, some deceleration valves on Mikuni carbs...some a combo of everything. All-in-all..I look at it as anything extra put on a carb..usually ( I say usually) will give ya fits sooner or later.

#36---> https://www.yamahapartshouse.com/oempar ... ectrical-1
User avatar
Flyingdog
Silver Membership
Silver Membership
 
Posts: 3239
Joined: Fri Jun 23, 2017 2:31 am
Location: Colorado Flag
Bike year & model: 1985 xv1000 Virago
1981 xv750 Virago
Sex: Male

Re: questions about xv700 to xv1000 engine swap.

PostAuthor: motorlou » Sun Aug 11, 2019 1:59 am

thanks for the chime. this being said, i believe i can use either tci in either motor. i cant see any differences in the engines except bigger displacements? the pick up coils even look the same (other than the pin connectors being in different positions at the tcis i think i like the 700 tci better because it just has less pins to deal with. i use my bike to commute everyday so i cant just begin swapping stuff on it. but i definately want to answer these oddball questions i have about electrical parts interchangeability.

motorlou
Junior Membership
Junior Membership
 
Posts: 71
Joined: Sat Sep 01, 2018 11:49 pm
  Flag
Bike year & model: 1985 virago xv700 and 1985 virago xv1000
Sex: Male

Re: questions about xv700 to xv1000 engine swap.

PostAuthor: Arjay » Sat Sep 07, 2019 10:33 pm

Man, you guys are singing my tune. I messed my xv1100 virago tci when swapping engines pinched/shorted the wire to the pressure sensor. Now I got no spark and no fuel pump, and yes been all through the safety shut off and clipped the wire at the tci.

What keeps crossing through my mind is look how cheap the xv250s are, I imagine they are 2 cylinder and Yamaha dropped 2 pickups for 1. One pickup works because sparking is done on tdc compression and tdc exhaust and I think the timing is done from two metal strips on the flywheel. (reluctance), first strip is before tdc, to measure speed against second strip at tdc. Or maybe the measure is last tdc then first strip, whatever, point is I think the 2 strips establish engine speed. So maybe pressure sensor isnt needed.

Currently, the price of a guaranteed xv1100 tci near $400 after mailing and taxes. but that would include all safety features and fuel pump handling.

If I skip safety features. Side stand down+in gear=off. Side stand up + in gear + clutch released = no start. Also fuel pump shuts off when gas is low until put in reserve.

So, skipping the safeties, I could use ignition portion of tci only. Hook fuel pump to power off main key switch or after kill, and rest is normal battery/reg-rect and lighting.

Is this wrong? Im thinking they might have monkey around with the reluctors spacing, but tdc is tdc ad rpm is rpm and dwell is dwell..

Because Ive seen some used ones as cheap as $15.

Arjay
Senior Membership
Senior Membership
 
Posts: 268
Joined: Tue Sep 11, 2018 9:18 pm
Location: Summerfield Flag
Bike year & model: 1996 Virago 1100
Sex: Male

Re: questions about xv700 to xv1000 engine swap.

PostAuthor: Arjay » Sat Sep 07, 2019 10:54 pm

motorlou wrote:hey guys just had a question about swapping out a 700 to 1000 engine (both 1985). i want to know the differences in the tci unit. besides timing curves, i read you are supposed to use the pressure sensor from the 1000 along with its cdi. what is this sensor? where is it located. what does it sense?. on the xv1000 tci there are a few extra pins than the xv700. one for the kickstand relay(black/white) then there are red/white, black/red, and black/yellow that go to the said pressure sensor. can the sensor be bypassed? if so how? can an xv1000 tci be used on the 700 or vice versa?


Pre 1990 has 2 sensors (reluctors). so your years matching is good. both tci will handle 2 sensors. You will want to use your 700 tci if your wiring trunk still has tci connectors. In fact whatever safety features your 700 had, you'll still have.

Ignitech has a nicd solution though, the programmable model can include the ressure sensor if backfiring becomes an issue. Model Sparker Tc4
http://www.ignitech.cz/en/vyrobky.htm

Arjay
Senior Membership
Senior Membership
 
Posts: 268
Joined: Tue Sep 11, 2018 9:18 pm
Location: Summerfield Flag
Bike year & model: 1996 Virago 1100
Sex: Male

Re: questions about xv700 to xv1000 engine swap.

PostAuthor: motorlou » Sun Jan 19, 2020 6:14 pm

well guys. this weekend i ended up having to swap engines on my 1985 xv700 daily rider. during the week the emgine started knocking from the bottom end. i dont really have time to split the engine and fix it right now but i had 2 xv1000 engines laying around. both are 1985 models and both have good compression.
. soooo......i picked one and slapped her in. i kept the xv700 tci unit so i didnt have to mess with the pressure sensor. everything was a direct plug in. she started right up. here are a coulple pics. i dont know how to post videos but she sounds great and runs like a raped ape!!
You do not have the required permissions to view the files attached to this post.

motorlou
Junior Membership
Junior Membership
 
Posts: 71
Joined: Sat Sep 01, 2018 11:49 pm
  Flag
Bike year & model: 1985 virago xv700 and 1985 virago xv1000
Sex: Male

Re: questions about xv700 to xv1000 engine swap.

PostAuthor: nanno » Mon Jan 20, 2020 12:05 pm

Just how I like my Viragos... a bit tatty and grimey and well ridden. :cl:
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*
User avatar
nanno
Silver Membership
Silver Membership
 
Posts: 1368
Images: 1
Joined: Thu May 26, 2011 4:06 pm
  Flag
Bike year & model: 1981 Yamaha TR1
1982 Yamaha TR1 Turbo
1977 XS 750 Sidecar
1984 XT500 4Valve (Austrian Tax saving edition)
1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male

Re: questions about xv700 to xv1000 engine swap.

PostAuthor: motorlou » Wed Jan 22, 2020 8:53 am

yeah mate she has given me alot of miles a alot of good memories, and we aint done yet.....

motorlou
Junior Membership
Junior Membership
 
Posts: 71
Joined: Sat Sep 01, 2018 11:49 pm
  Flag
Bike year & model: 1985 virago xv700 and 1985 virago xv1000
Sex: Male

Re: questions about xv700 to xv1000 engine swap.

PostAuthor: nanno » Wed Jan 22, 2020 10:00 am

You seem to be a member of the low-end-grunt-kind: If you install the 700 heads on the 1100 engine, you bump the compression up a healthy dose. I did that on my own bike and fits the character perfectly with the heavy 1100 crank.

(Just built an1100 v-star based engine and the jury's opinion is still out on this one as it has got an a lot lighter crank and is more happy to rev...)
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*
User avatar
nanno
Silver Membership
Silver Membership
 
Posts: 1368
Images: 1
Joined: Thu May 26, 2011 4:06 pm
  Flag
Bike year & model: 1981 Yamaha TR1
1982 Yamaha TR1 Turbo
1977 XS 750 Sidecar
1984 XT500 4Valve (Austrian Tax saving edition)
1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male

Re: questions about xv700 to xv1000 engine swap.

PostAuthor: motorlou » Wed Jan 22, 2020 11:58 pm

hey nanno you really got my attention with the thing about the heads. i am working on my xv1000 softail project and it will be getting the other 1000cc engine i have laying around. it actually needs the front head repaired(valve and maybe guide). do you think my 700cc heads would work on that engine? btw when i swapped engines from 700cc to 1000cc i noticed a very pleasant increase in power and i also thought i could probably even increase that by running dual mikunis vs. the single mikuni set up i im running now. any input on the 700cc heads and dual mikunis on a 1000cc engine? here is a picture of my 1000cc softail project
You do not have the required permissions to view the files attached to this post.

motorlou
Junior Membership
Junior Membership
 
Posts: 71
Joined: Sat Sep 01, 2018 11:49 pm
  Flag
Bike year & model: 1985 virago xv700 and 1985 virago xv1000
Sex: Male

Re: questions about xv700 to xv1000 engine swap.

PostAuthor: nanno » Thu Jan 23, 2020 12:46 am

Dual Mikuni VM38s with 700 heads and a 1000/1100 engine? Welcome to my Everday-TR1. It's a lovely combo. If you have the time (and some sort of a Dremel), clean up the ports around the valve seats and you've done 90 percent of the reasonable (street-)porting work on one of these heads.

If you go to VM38s get the button-style choke knobs instead of the stock levers as it makes using the choke a lot easier. Other than that, 2in1 cables are available from a lot of XS650 shops, so you can run the stock throttle grip, but just check my blog for the details, I did a bit of a writeup on how to get the VM38s ready for action on a TR1.
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*
User avatar
nanno
Silver Membership
Silver Membership
 
Posts: 1368
Images: 1
Joined: Thu May 26, 2011 4:06 pm
  Flag
Bike year & model: 1981 Yamaha TR1
1982 Yamaha TR1 Turbo
1977 XS 750 Sidecar
1984 XT500 4Valve (Austrian Tax saving edition)
1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male

Re: questions about xv700 to xv1000 engine swap.

PostAuthor: motorlou » Thu Jan 23, 2020 9:06 am

yep i am definately going to do it!! ill take some good pictures as well. i am super stoked to be using a virago 1000 as a power plant for my chopper project. excellent engine.

motorlou
Junior Membership
Junior Membership
 
Posts: 71
Joined: Sat Sep 01, 2018 11:49 pm
  Flag
Bike year & model: 1985 virago xv700 and 1985 virago xv1000
Sex: Male

Re: questions about xv700 to xv1000 engine swap.

PostAuthor: ttfraz » Fri Apr 10, 2020 12:59 pm

nanno wrote:Dual Mikuni VM38s with 700 heads and a 1000/1100 engine? Welcome to my Everday-TR1. It's a lovely combo. If you have the time (and some sort of a Dremel), clean up the ports around the valve seats and you've done 90 percent of the reasonable (street-)porting work on one of these heads.

If you go to VM38s get the button-style choke knobs instead of the stock levers as it makes using the choke a lot easier. Other than that, 2in1 cables are available from a lot of XS650 shops, so you can run the stock throttle grip, but just check my blog for the details, I did a bit of a writeup on how to get the VM38s ready for action on a TR1.
Hey nanno, got any more info on the ports?

ttfraz
Junior Membership
Junior Membership
 
Posts: 21
Joined: Thu Jun 28, 2018 10:01 am
Location: Merrimac, MA Flag
Bike year & model: 1981 XV920R
Sex: Male

Re: questions about xv700 to xv1000 engine swap.

PostAuthor: nanno » Fri Apr 10, 2020 1:31 pm

There's a casting step in there, which should be dressed up a little. Simply check my engine build thread here in the forum and there should be photos.
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*
User avatar
nanno
Silver Membership
Silver Membership
 
Posts: 1368
Images: 1
Joined: Thu May 26, 2011 4:06 pm
  Flag
Bike year & model: 1981 Yamaha TR1
1982 Yamaha TR1 Turbo
1977 XS 750 Sidecar
1984 XT500 4Valve (Austrian Tax saving edition)
1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male



Post a reply


  • Advertisement

Return to Virago Help - Motor Swap

Who is online

Registered users: No registered users

cron