Forum Donations
Search
VTF Google Search
 Click Here

750 engine swap

Everything about swapping a motor on your Virago.
  • Advertisement

Post a reply

750 engine swap

PostAuthor: Nick beale » Fri Feb 09, 2018 2:47 pm

Hi hope you can help. I have an early 750 Virago with the bendix type starter which never worked so have changed the motor to the later type with the updated starter system. All fitted OK but have a problem the wires coming from the generator are different? So what do I need to do, is it a case of changing the generator internals into the new motor or is there a easier fix. The reason for the motor change was because of the starter problems. Please help it must be a tried and tested swap. Thanks

Nick beale
Junior Membership
Junior Membership
 
Posts: 14
Joined: Fri Feb 09, 2018 2:23 pm
  Flag
Bike year & model: XV 750virago
Sex: Male

Re: 750 engine swap

PostAuthor: faffi » Fri Feb 09, 2018 4:11 pm

Ignition and alternator differ, so you will need a new R/R, new TCI and new coils. Unless it is possible to retrofit the items from your old engine? That is something I cannot answer. Also, all Gen II 750 engines are not the same, so you need to verify what system is fitted to your particular engine.
User avatar
faffi
Silver Membership
Silver Membership
 
Posts: 2781
Images: 10
Joined: Sun Feb 15, 2015 3:11 pm
  Flag
Bike year & model: 1982 XV750SE with XV1100 engine, XT600Z shock absorber, 18" Seca rear wheel
Sex: Male

Re: 750 engine swap

PostAuthor: Nick beale » Fri Feb 09, 2018 4:32 pm

Can I take the internal parts from the old casing and refit them in the new casing?

Nick beale
Junior Membership
Junior Membership
 
Posts: 14
Joined: Fri Feb 09, 2018 2:23 pm
  Flag
Bike year & model: XV 750virago
Sex: Male

Re: 750 engine swap

PostAuthor: faffi » Fri Feb 09, 2018 6:29 pm

Someone else must answer that, or you can try searching the site. It may be enough to change the stator and pickups.
User avatar
faffi
Silver Membership
Silver Membership
 
Posts: 2781
Images: 10
Joined: Sun Feb 15, 2015 3:11 pm
  Flag
Bike year & model: 1982 XV750SE with XV1100 engine, XT600Z shock absorber, 18" Seca rear wheel
Sex: Male

Re: 750 engine swap

PostAuthor: Nick beale » Sat Feb 10, 2018 12:38 pm

I have just looked inside the old casing, the generator wires are the same but the ignition pickup coils wires are different, the old motor has two wires and the newer one has four. It would seem to me if I changed the pick up coils over that would do the trick but will they fit the newer motor? Please help

Nick beale
Junior Membership
Junior Membership
 
Posts: 14
Joined: Fri Feb 09, 2018 2:23 pm
  Flag
Bike year & model: XV 750virago
Sex: Male

Re: 750 engine swap

PostAuthor: Jake » Sat Feb 10, 2018 2:26 pm

You don’t say what year the “new” 750 is, and it could be the pickups are the issue.

Check this thread, it may have the answer you need https://www.viragotechforum.com/viewtop ... =5&t=54789
_______________________________________________________________________
“It ain’t what you don’t know that gets you in trouble.
It’s what you know for sure that just ain’t so.”

~Mark Twain
User avatar
Jake
Mod
Mod
 
Posts: 11919
Images: 108
Joined: Wed Jun 06, 2007 3:18 pm
Location: Penn's Forestland otherwise known as Pennsylvania Flag
Bike year & model: 1996 XV750
Sex: Male

Re: 750 engine swap

PostAuthor: Nick beale » Sat Feb 10, 2018 3:28 pm

Have a look at this picture I'm not sure of the years

https://photos.app.goo.gl/VqsUHMYM0jMMYa9s1

Nick beale
Junior Membership
Junior Membership
 
Posts: 14
Joined: Fri Feb 09, 2018 2:23 pm
  Flag
Bike year & model: XV 750virago
Sex: Male

Re: 750 engine swap

PostAuthor: Nick beale » Sat Feb 10, 2018 3:30 pm

I think the old motor is 91 and the new one is 93.

Nick beale
Junior Membership
Junior Membership
 
Posts: 14
Joined: Fri Feb 09, 2018 2:23 pm
  Flag
Bike year & model: XV 750virago
Sex: Male

Re: 750 engine swap

PostAuthor: Nick beale » Sat Feb 10, 2018 3:31 pm

Cyes the pickups are the issue

Nick beale
Junior Membership
Junior Membership
 
Posts: 14
Joined: Fri Feb 09, 2018 2:23 pm
  Flag
Bike year & model: XV 750virago
Sex: Male

Re: 750 engine swap

PostAuthor: Nick beale » Sun Feb 11, 2018 4:02 pm

Right the newer engine has a single ignition pickup the older original motor has two with a three bolt fixing but the newer one has a spare bolt mount giving three mounts so can I swap the older one into the new motor this would solve my problem.... Can someone please help?

Nick beale
Junior Membership
Junior Membership
 
Posts: 14
Joined: Fri Feb 09, 2018 2:23 pm
  Flag
Bike year & model: XV 750virago
Sex: Male

Pick up ciols

PostAuthor: Nick beale » Mon Feb 12, 2018 4:39 pm

Hi. I have just changed my 750 fist Gen to a gen two motor. But have a problem as the early motor has a two pick up system on the flywheel with four wires and the newer motor 1993 has the single pick with two wires. So what can I do to hook up it up. Options...... 1fit the two pick ups to the later motor which I think will fit?. 2....Fit the later loom ....or is there a rewire I can do?.. Heeeeeeelp!!!!

Nick beale
Junior Membership
Junior Membership
 
Posts: 14
Joined: Fri Feb 09, 2018 2:23 pm
  Flag
Bike year & model: XV 750virago
Sex: Male

Re: Pick up ciols

PostAuthor: choppin » Mon Feb 12, 2018 5:34 pm

Are you using the TCI from the newer engine?
User avatar
choppin
Silver Membership
Silver Membership
 
Posts: 1455
Images: 3
Joined: Sun Dec 02, 2012 6:22 pm
  Flag
Bike year & model: 1982 920J VIRAGO
2004 harley 883
1987 150 Elite Honda (sold)
1983 920K virago
1986 XV700ss (sold)
1982 GL Honda Goldwing (sold)
1982 920 virago (parts bike)
1987 XV1100 (sold)
1984 XV700 (building trike)
Sex: Male

Re: Pick up ciols

PostAuthor: mark75 » Mon Feb 12, 2018 5:37 pm

the "easy" reply would be, "just fit the Gen-I flywheel into the new Gen-II engine and use the original harness".

the problem there is that's not so easy to do because the F/W is a booger to get off [either/both], but all-that might be easier than acquiring a new harness ...

either way, me thinks you will become very fluent in "wiring" soon.
"Over the Mountains of the Moon,
Down the Valley of the Shadow,
Ride, boldly ride" ... E.A. Poe

'13 - FXDC Super Glide Custom
'82 - XV750

Time flies whether you're having fun __ :bike: ... or not ... :fan: ---
and --- Any day above ground is a good day.
so Laissez les bon temps roulez ... just roll safely

"I hear and I forget, I see and I remember, I do and I understand." ... Confucius*

If you don't read the news you are not informed.
If you read the news you are misinformed.
... Mark Twain

New Members Note- The site will allow full access (U/L, D/L, PM, etc) after your 5th post.

TIP: search the Knowledge Base Board Nav., Tech Articles, Tips, and Links for tricks, and Solutions...
the search may seem or feel ponderous, but it's worth the effort.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
*The views, opinions, and experiences expressed in this post are mine and may not necessarily represent views and opinions of other VTF members, so feel free to agree, disagree, or ignore them.*
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
User avatar
mark75
Mod
Mod
 
Posts: 15360
Images: 15
Joined: Sun Apr 02, 2006 3:57 am
Location: Republic of Texas Flag
Sex: Male

Re: Pick up ciols

PostAuthor: Nick beale » Mon Feb 12, 2018 6:05 pm

I have both but they look the same?

Nick beale
Junior Membership
Junior Membership
 
Posts: 14
Joined: Fri Feb 09, 2018 2:23 pm
  Flag
Bike year & model: XV 750virago
Sex: Male

Re: Pick up ciols

PostAuthor: Nick beale » Mon Feb 12, 2018 6:08 pm

I can get the loom that went with the new motor

Nick beale
Junior Membership
Junior Membership
 
Posts: 14
Joined: Fri Feb 09, 2018 2:23 pm
  Flag
Bike year & model: XV 750virago
Sex: Male

Re: Pick up ciols

PostAuthor: mark75 » Tue Feb 13, 2018 2:26 pm

label the flywheels so they don't get mixed-up, they have different [& individual] trigger points

myself [even though my least favorite things to do on the planet are anything electrical or plumbing] I would go with the "new" harness with the new engine [and TCI also if you have it]
others might adapt the old harness :con:

if you think you might want to inspect the harness and make sure it's in good shape 'inside', here's an excellent TRV post about re-building your harness --->https://viragotechforum.com/viewtopic.php?f=140&t=29436
"Over the Mountains of the Moon,
Down the Valley of the Shadow,
Ride, boldly ride" ... E.A. Poe

'13 - FXDC Super Glide Custom
'82 - XV750

Time flies whether you're having fun __ :bike: ... or not ... :fan: ---
and --- Any day above ground is a good day.
so Laissez les bon temps roulez ... just roll safely

"I hear and I forget, I see and I remember, I do and I understand." ... Confucius*

If you don't read the news you are not informed.
If you read the news you are misinformed.
... Mark Twain

New Members Note- The site will allow full access (U/L, D/L, PM, etc) after your 5th post.

TIP: search the Knowledge Base Board Nav., Tech Articles, Tips, and Links for tricks, and Solutions...
the search may seem or feel ponderous, but it's worth the effort.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
*The views, opinions, and experiences expressed in this post are mine and may not necessarily represent views and opinions of other VTF members, so feel free to agree, disagree, or ignore them.*
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
User avatar
mark75
Mod
Mod
 
Posts: 15360
Images: 15
Joined: Sun Apr 02, 2006 3:57 am
Location: Republic of Texas Flag
Sex: Male

Gen one to Gen two engine swap

PostAuthor: Nick beale » Thu Mar 01, 2018 2:09 pm

Hi, I am desperate for some advice. I have a Gen one 750 which had a noisy starter so have bought a Gen two 750 motor with the later soloniod type starter. The problem is the wiring is different so I want to swap over the pick up coils, generator windings and flywheel from the older motor into the newer motor or is there a simple way to modified the wiring look. I do have the loom from the newer motor. What can I do can somebody please help me.....

Nick beale
Junior Membership
Junior Membership
 
Posts: 14
Joined: Fri Feb 09, 2018 2:23 pm
  Flag
Bike year & model: XV 750virago
Sex: Male

Re: Gen one to Gen two engine swap

PostAuthor: faffi » Thu Mar 01, 2018 3:05 pm

There is an ongoing thread on this already, and a bunch of older ones. I cannot tell how easy or hard it is to move the flywheel etc. over to the newer engine, but I used the new harness (but unless you also have switchgear, ignition switch and instruments from the donor bike you have some mods to make). You also need the cylinder head engine mounts from your old engine and fit them to the the new one - without disturbing the cylinder head gasket, so be careful. The coils from the newer bike is a serious PITA to fit because they don't - you need to fabricate some mounts, and even then room is at a premium.
User avatar
faffi
Silver Membership
Silver Membership
 
Posts: 2781
Images: 10
Joined: Sun Feb 15, 2015 3:11 pm
  Flag
Bike year & model: 1982 XV750SE with XV1100 engine, XT600Z shock absorber, 18" Seca rear wheel
Sex: Male

Re: Gen one to Gen two engine swap

PostAuthor: Jake » Thu Mar 01, 2018 5:15 pm

faffi wrote:There is an ongoing thread on this already


Three threads, different areas, same issue, same poster. All one thread now.
_______________________________________________________________________
“It ain’t what you don’t know that gets you in trouble.
It’s what you know for sure that just ain’t so.”

~Mark Twain
User avatar
Jake
Mod
Mod
 
Posts: 11919
Images: 108
Joined: Wed Jun 06, 2007 3:18 pm
Location: Penn's Forestland otherwise known as Pennsylvania Flag
Bike year & model: 1996 XV750
Sex: Male

Re: 750 engine swap

PostAuthor: faffi » Thu Mar 01, 2018 5:32 pm

:GJ: :thanks:
User avatar
faffi
Silver Membership
Silver Membership
 
Posts: 2781
Images: 10
Joined: Sun Feb 15, 2015 3:11 pm
  Flag
Bike year & model: 1982 XV750SE with XV1100 engine, XT600Z shock absorber, 18" Seca rear wheel
Sex: Male


Next

Post a reply


  • Advertisement

Return to Virago Help - Motor Swap

Who is online

Registered users: Baidu [Spider], bbqb4racin, G3PO, Google [Bot], gswatson, M_E_R_C_U_R_Y, Majestic-12 [Bot], manchoi44, pauloasbrito, ricky yates, thisiswho, ttfraz