1984 honda shadow vt700c universal solenoid - Page 2 - Honda Shadow Forums : Shadow Motorcycle Forum
Reply
 
LinkBack Thread Tools
post #11 of 20 (permalink) Old 06-11-2019, 04:58 PM
Senior Member
 
swifty2014's Avatar
 
Join Date: Oct 2014
Model: Vt750
Year: 1983
Location: Washington State
Posts: 10,650
Garage
Here is the start circuit on our older bikes.


A starter solenoid is just a big heavy duty electric switch. It handles the big current while being activated by a small current. Any solenoid will do the same thing if it fits where you need it.

Attached Thumbnails
Click image for larger version

Name:	start solenoid.PNG
Views:	15
Size:	76.1 KB
ID:	263284  

Only a biker knows why a dog sticks his head out of a car window.
1983 750 Shadow
From the past=
1951 Cushman scooter
1962 Honda 305 Dream
1965 Honda 305 Dream
1971 Honda 175 scrambler
swifty2014 is offline  
Sponsored Links
Advertisement
 
post #12 of 20 (permalink) Old 06-11-2019, 05:08 PM
Senior Member
 
swifty2014's Avatar
 
Join Date: Oct 2014
Model: Vt750
Year: 1983
Location: Washington State
Posts: 10,650
Garage
Here is the start circuit on our older bikes.

Attached Thumbnails
Click image for larger version

Name:	start solenoid.PNG
Views:	7
Size:	76.1 KB
ID:	263286  

Only a biker knows why a dog sticks his head out of a car window.
1983 750 Shadow
From the past=
1951 Cushman scooter
1962 Honda 305 Dream
1965 Honda 305 Dream
1971 Honda 175 scrambler
swifty2014 is offline  
post #13 of 20 (permalink) Old 06-12-2019, 07:51 AM
Member
 
ShadowGeezer's Avatar
 
Join Date: Sep 2018
Model: VT700
Year: 1985
Location: West Coast Florida
Posts: 176
Garage
I think you guys have it figured out from the solenoid wiring standpoint. I just came up with a bright idea on the possible function of the 2nd spark unit (that due to the tight-lipped and likely deceased Japanese engineers, probably can't be proved/disproved)...Bikes have a separate switch that actuates the starter. In other words, there is no unitized switch that both controls the ignition and accessories. That said, there is no ignition switch position that kills the accessories while cranking, so whatever is "on", is "on" during cranking the bike. My theory is that since the second spark unit is in parallel with the first unit, you guys are right on with the similar function to the bypass circuit on the old coil resistors. My guess is that the second spark unit is a second set of capacitors that gets brought in as a boosting capacitor discharge unit to boost voltage to the plugs during the load on the battery during cranking. It may even be a "shower of sparks" CDI to aid in cold starts. My guess is that in later models, they eliminated the 2nd unit by increasing the capacitance in the primary units, running a " hotter" ignition full-time. Just my $.02..

If it jams, force it. If it breaks it needed replacing anyway.
ShadowGeezer is offline  
 
post #14 of 20 (permalink) Old 06-12-2019, 11:53 AM
Senior Member
 
swifty2014's Avatar
 
Join Date: Oct 2014
Model: Vt750
Year: 1983
Location: Washington State
Posts: 10,650
Garage
So many possibilities. But these older ignitions are called Transistor Ignition systems that replaced the old basic point systems. They used a power transistor to ground the coil negative as the old points used to do.

Then later years came out with an actual CDI system and the service manuals for those show a voltage to the coils over 100 + volts. That was new to me too.

Only a biker knows why a dog sticks his head out of a car window.
1983 750 Shadow
From the past=
1951 Cushman scooter
1962 Honda 305 Dream
1965 Honda 305 Dream
1971 Honda 175 scrambler
swifty2014 is offline  
post #15 of 20 (permalink) Old 06-12-2019, 01:08 PM
Senior Member
 
Join Date: Aug 2017
Model: Shadow Spirit VT1100C A
Year: 2000
Location: Milford, Michigan
Posts: 2,308
Garage
Quote:
Originally Posted by swifty2014 View Post
So many possibilities. But these older ignitions are called Transistor Ignition systems that replaced the old basic point systems. They used a power transistor to ground the coil negative as the old points used to do.

Then later years came out with an actual CDI system and the service manuals for those show a voltage to the coils over 100 + volts. That was new to me too.

Remember back in the old days when on any given day in any given parking lot or side street you could watch some car with a dead battery getting push started by their friend in another car?

Then along came alternators and ruined everything.
Chuck_Michigan is online now  
post #16 of 20 (permalink) Old 06-12-2019, 07:19 PM
Senior Member
 
swifty2014's Avatar
 
Join Date: Oct 2014
Model: Vt750
Year: 1983
Location: Washington State
Posts: 10,650
Garage
Yes those were the good old days. Automatic transmissions had a rear pump so you could get it up to about 35 MPH and it would turn the engine to start.

And the good old steel bumpers that when you rear ended someone your front bumper got hooked under their rear bumper , so you would see guys jumping up and down on the bumper to free them. Fun Times !


I saw this picture of a bumper mounted trailer hitch and had a good laugh. Built like a tank.
Attached Thumbnails
Click image for larger version

Name:	1950 Dodge Meadowbrook.jpg
Views:	13
Size:	133.2 KB
ID:	263332  

Only a biker knows why a dog sticks his head out of a car window.
1983 750 Shadow
From the past=
1951 Cushman scooter
1962 Honda 305 Dream
1965 Honda 305 Dream
1971 Honda 175 scrambler
swifty2014 is offline  
post #17 of 20 (permalink) Old 06-12-2019, 11:27 PM
Member
 
ShadowGeezer's Avatar
 
Join Date: Sep 2018
Model: VT700
Year: 1985
Location: West Coast Florida
Posts: 176
Garage
Quote:
Originally Posted by swifty2014 View Post
Yes those were the good old days. Automatic transmissions had a rear pump so you could get it up to about 35 MPH and it would turn the engine to start.

And the good old steel bumpers that when you rear ended someone your front bumper got hooked under their rear bumper , so you would see guys jumping up and down on the bumper to free them. Fun Times !


I saw this picture of a bumper mounted trailer hitch and had a good laugh. Built like a tank.
And the body work was 8ga. and 10ga. "sheet metal" that did a wonderful job of transferring collision energy directly to the passengers.. And "souped up" ignitions were dual-point dual-coil setups to keep up with the demands of balanced and blueprinted engines that would turn (Wow!) 7,000 rpm to move those lead sleds...

If it jams, force it. If it breaks it needed replacing anyway.
ShadowGeezer is offline  
post #18 of 20 (permalink) Old 06-15-2019, 03:17 AM
Member
 
shado#9's Avatar
 
Join Date: Jun 2013
Location: Mpls MN
Posts: 64
ok perhaps late or off track a bit But you can disassemble the new solenoid /relay and re use your old harness ...I did ... I have 86 vt1100 and the start relay was not an exact match wire wise ...
so after purchase from ebay I disassembled the top of mine and new and did the swap ...
worked like a charm....good luck
shado#9 is offline  
post #19 of 20 (permalink) Old 06-15-2019, 09:13 AM
Member
 
Big Shrek's Avatar
 
Join Date: Jul 2018
Model: VT500C
Year: 1983
Location: Pensacola, Florida
Posts: 300
Garage
Quote:
Originally Posted by shado#9 View Post
ok perhaps late or off track a bit But you can disassemble the new solenoid /relay and re use your old harness ...I did ... I have 86 vt1100 and the start relay was not an exact match wire wise ...
so after purchase from ebay I disassembled the top of mine and new and did the swap ...
worked like a charm....good luck
now THAT is something you should have taken pics of!! A few helpful photos to assist those of us who've never seen one dissassembled!!

Ride paranoid. Don't let anything distract you.
Keep the paint side up, wear the lid & leathers.
Big Shrek is offline  
post #20 of 20 (permalink) Old 06-15-2019, 10:51 AM Thread Starter
Member
 
Join Date: May 2019
Model: VT 700
Year: 1984
Location: Rockford, IL
Posts: 67
I found a NOS solenoid. Should be here next week. Having some other odd electrical problems. Going to create a new thread for that.

jmsanch is online now  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



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

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



Posting Rules  
You may not post new threads
You may not 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