Power loss - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
VN750 General Discussion

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 16 (permalink) Old 05-26-2013, 01:38 PM Thread Starter
Junior Member
 
Join Date: Jul 2012
Location: Northeastern Ohio
Posts: 27
iTrader: (0)
 
Unhappy Power loss

I was ridin my 86 vn750 into work today, I got on the freeway and it felt as if it lost power. I couldn't get it to go above 60 mph. I tried downshifting into fourth but that didnt help much. I had this problem a few times last year. When it happens I can pull in the clutch and hit high rpms but under a load it won't exceed 60 and if I hit an incline it won't maintain 60. At slower speeds it accelerates fine and sometimes I have no problem getting up to 90. It puzzles me, last year I replaced the plugs, wires stator and r&r. Just changed the oil. Also when it happened today the temp gauge climbed to almost red then started to come back down, I have no idea where to start. Please and thank you guys, this site has never let me down
sdphill92 is offline  
Sponsored Links
Advertisement
 
post #2 of 16 (permalink) Old 05-26-2013, 01:44 PM
Prowling Tiger
 
blazblu82's Avatar
 
Join Date: Apr 2012
Posts: 2,048
iTrader: (4)
 
Engines do struggle to maintain power when they get hot. Might check the water thermostat and see if it is opening at the proper temp. IF not, it may not be cycling the water, thus, leading to a too hot condition resulting in power loss. Also check the fan switch and associated wires.

Does the power return when the temp drops to normal range?

I only understand what I don't understand.
blazblu82 is offline  
post #3 of 16 (permalink) Old 05-26-2013, 01:51 PM
..have a vulcan good day!
 
WilliamTech's Avatar
 
Join Date: May 2011
Location: Pensacola, FL.
Posts: 4,508
iTrader: (17)
   
Quote:
Originally Posted by sdphill92 View Post
I was ridin my 86 vn750 into work today, I got on the freeway and it felt as if it lost power. I couldn't get it to go above 60 mph. I tried downshifting into fourth but that didnt help much. I had this problem a few times last year. When it happens I can pull in the clutch and hit high rpms but under a load it won't exceed 60 and if I hit an incline it won't maintain 60. At slower speeds it accelerates fine and sometimes I have no problem getting up to 90. It puzzles me, last year I replaced the plugs, wires stator and r&r. Just changed the oil. Also when it happened today the temp gauge climbed to almost red then started to come back down, I have no idea where to start. Please and thank you guys, this site has never let me down

With no load, .... RPM's rise no problem.
My first thought, one of your cylinders (spark) is dropping out (occasionally).

I would first Check / Clean ALL electrical connections/connectors partially @ Ignitor and @ coils.
And Grounds...Grounds....grounds...clean em' !

hope this helps

+1
WilliamTech is offline  
 
post #4 of 16 (permalink) Old 05-26-2013, 02:26 PM
Senior Member
 
Join Date: Mar 2012
Posts: 450
iTrader: (0)
 
Garage
Clean your carbs. Sounds like one or both of the main jets may be dirty.
Rebel13 is offline  
post #5 of 16 (permalink) Old 05-26-2013, 05:23 PM Thread Starter
Junior Member
 
Join Date: Jul 2012
Location: Northeastern Ohio
Posts: 27
iTrader: (0)
 
Quote:
Originally Posted by blazblu82 View Post
Engines do struggle to maintain power when they get hot. Might check the water thermostat and see if it is opening at the proper temp. IF not, it may not be cycling the water, thus, leading to a too hot condition resulting in power loss. Also check the fan switch and associated wires.

Does the power return when the temp drops to normal range?
I replaced the thermostat a couple of weeks ago, although maybe I got a faulty one, I think I'm going to pull it and test, also when I pulled the sensor from the radiator it has some crud build up, so maybe ill flush the radiator while I'm at it. Is there any suggestions on a good way to flush the whole system?
sdphill92 is offline  
post #6 of 16 (permalink) Old 05-26-2013, 05:25 PM
Prowling Tiger
 
blazblu82's Avatar
 
Join Date: Apr 2012
Posts: 2,048
iTrader: (4)
 
Quote:
Originally Posted by sdphill92 View Post
I replaced the thermostat a couple of weeks ago, although maybe I got a faulty one, I think I'm going to pull it and test, also when I pulled the sensor from the radiator it has some crud build up, so maybe ill flush the radiator while I'm at it. Is there any suggestions on a good way to flush the whole system?
I'm certain here is; however, I'm not familiar with working on that part of the bike. Sorry.

I only understand what I don't understand.
blazblu82 is offline  
post #7 of 16 (permalink) Old 05-26-2013, 05:31 PM Thread Starter
Junior Member
 
Join Date: Jul 2012
Location: Northeastern Ohio
Posts: 27
iTrader: (0)
 
No worries, I just found a couple threads on flushing
sdphill92 is offline  
post #8 of 16 (permalink) Old 05-26-2013, 05:33 PM
Jack of all trades
 
M_Angell's Avatar
 
Join Date: Jul 2009
Location: Westland, Michigan
Posts: 2,863
iTrader: (11)
 
I've flushed the whole system with a garden hose before. I opened the drain plug and flushed the radiator out off the bike. For the water jackets I hooked the radiator back up and ran water til it came out.clear. next I ran coolant and flushed 3 times. Seems overkill but I haven't had a cooling problem ever.

2003 vn750
1988 Pontiac Trans Am (project/driver)
M_Angell is offline  
post #9 of 16 (permalink) Old 05-26-2013, 05:34 PM
Prowling Tiger
 
blazblu82's Avatar
 
Join Date: Apr 2012
Posts: 2,048
iTrader: (4)
 
Quote:
Originally Posted by M_Angell View Post
I've flushed the whole system with a garden hose before. I opened the drain plug and flushed the radiator out off the bike. For the water jackets I hooked the radiator back up and ran water til it came out.clear. next I ran coolant and flushed 3 times. Seems overkill but I haven't had a cooling problem ever.
I wouldn't have an issue doing this; however, how does one dispose of the coolant? It's not exactly bio-friendly.

I only understand what I don't understand.
blazblu82 is offline  
post #10 of 16 (permalink) Old 05-27-2013, 08:42 PM Thread Starter
Junior Member
 
Join Date: Jul 2012
Location: Northeastern Ohio
Posts: 27
iTrader: (0)
 
Last night I flushed my cooling system real good. Also tested the thermostat and it is functioning good. So I rode to work today no problems. On the way home same thing, low power under load. Fine with no load. But I was quicker to observe the overheat this time. It didnt begin to overheat till it was experiencing the power problem. It is frustrating me
sdphill92 is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Tags
50-60 , power loss

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