VN700 vs VN750 motor comparison - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Engine / Exhaust / Cooling
\ From the radiator, through the case and out
the exhaust. If it has to do with the cooling,
engine or exhaust, discuss it here!

 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 02-27-2011, 09:00 PM Thread Starter
Junior Member
 
Join Date: Jan 2011
Posts: 20
iTrader: (0)
 
VN700 vs VN750 motor comparison

Anyone know how they increased displacement?

Increase in piston diameter or increase in stroke? Or a little of both.

I'm asking because I need to know which parts of a VN750 motor can I use to rebuild a VN700 motor.

Thanks for any help.
ckrockets is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 02-27-2011, 09:38 PM
Sparky!!!
 
slimvulcanrider's Avatar
 
Join Date: May 2008
Posts: 8,695
iTrader: (3)
   
Garage
bottom ends are the same, you need the 750 rods, pistons, and jugs (the cylinders). you can also swap heads between the two.
slimvulcanrider is offline  
post #3 of 7 (permalink) Old 02-28-2011, 01:00 AM Thread Starter
Junior Member
 
Join Date: Jan 2011
Posts: 20
iTrader: (0)
 
Quote:
Originally Posted by slimvulcanrider View Post
bottom ends are the same, you need the 750 rods, pistons, and jugs (the cylinders). you can also swap heads between the two.
Thanks for the info....

I am keeping it a 700...I believe I've damaged a rod or crank bearing...

So the cranks are the same?

Will all the gaskets for a 750 work on the 700?
ckrockets is offline  
 
post #4 of 7 (permalink) Old 02-28-2011, 06:42 PM
Linkmeister Supreme
 
OlHossCanada's Avatar
 
Join Date: Aug 2008
Location: Lethbridge, Alberta, Canada
Posts: 7,960
iTrader: (8)
   
I think all the gaskets and O-rings are interchangeable. Someone will correct me if I am mistaken on this.

Crankshaft/stroke is the same. 700 pistons are ~82 mm diameter. 750 pistons are ~84.9 mm.

As I recall, our late, great lance328 posted awhile back that piston rings for the 700 are no longer available.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html
OlHossCanada is offline  
post #5 of 7 (permalink) Old 02-28-2011, 08:28 PM Thread Starter
Junior Member
 
Join Date: Jan 2011
Posts: 20
iTrader: (0)
 
Quote:
Originally Posted by OlHossCanada View Post
I think all the gaskets and O-rings are interchangeable. Someone will correct me if I am mistaken on this.

Crankshaft/stroke is the same. 700 pistons are ~82 mm diameter. 750 pistons are ~84.9 mm.

As I recall, our late, great lance328 posted awhile back that piston rings for the 700 are no longer available.
That is some sad stuff about Ron sounded like a great guy.

The bike only has 10K miles should not have to replace the piston or rings...hopefully....

My balancer clutches went bad and the sprocket ate into the cases filling the bottom of the motor with aluminum shavings, clogged the screen and starved the bearings for oil...
ckrockets is offline  
post #6 of 7 (permalink) Old 02-28-2011, 08:59 PM
Senior Member
 
n2omike's Avatar
 
Join Date: Oct 2010
Location: Spencer, WV
Posts: 232
iTrader: (0)
 
Quote:
Originally Posted by slimvulcanrider View Post
bottom ends are the same, you need the 750 rods, pistons, and jugs (the cylinders). you can also swap heads between the two.
Are you sure about the connecting rods? If it was simply a bore increase, then there's a very good chance that the only differences would be the cylinders and pistons/rings.

05 VN750
Iridium Plugs
Spline Lubed front/rear
ignition pickups gapped
AGM Battery
Relocated MOSFET R/R
Coaster Mod
Pilot Screws at 2-1/4 turns
Slipstreamer S-08 Windshield
F&S Saddlebags/Mounts
Luggage Rack
12V Outlet
Mustang Seat
sissy bar
Oversized Pirelli Front Tire
6k miles

PW50, XR50, TTR90, XR100, DT175 (2-smoker), CRF230F, XR250R (dual sported), XR400R 4 KIDS, LOL!

1966 mustang street/strip
4-speed, nitrous
[email protected] 135.6
n2omike is offline  
post #7 of 7 (permalink) Old 02-28-2011, 09:06 PM
Senior Member
 
n2omike's Avatar
 
Join Date: Oct 2010
Location: Spencer, WV
Posts: 232
iTrader: (0)
 
I just checked Bikebandit. Connecting rods for both the 700 and 750 have the same part numbers... so they are interchangable. It looks like upgrading may just be a piston/cylinder swap.

The parts diagrams on Bike Bandit and at Cheap Cycle Parts is often very handy for seeing how things go together, and for doing research such as this.

700
http://www.bikebandit.com/houseofmot...m4521#sch42816

750
http://www.bikebandit.com/houseofmot...4526#sch309969

Good Luck!

05 VN750
Iridium Plugs
Spline Lubed front/rear
ignition pickups gapped
AGM Battery
Relocated MOSFET R/R
Coaster Mod
Pilot Screws at 2-1/4 turns
Slipstreamer S-08 Windshield
F&S Saddlebags/Mounts
Luggage Rack
12V Outlet
Mustang Seat
sissy bar
Oversized Pirelli Front Tire
6k miles

PW50, XR50, TTR90, XR100, DT175 (2-smoker), CRF230F, XR250R (dual sported), XR400R 4 KIDS, LOL!

1966 mustang street/strip
4-speed, nitrous
[email protected] 135.6
n2omike is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Once registered, your User Name"cannot be changed". We can make exceptions within 7 days, but after that, it is set in stone.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome