Pick up Mod question - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
Includes Electrical mods, Lights, Stator,
Rectifier, Diagrams, etc

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 11 (permalink) Old 04-03-2020, 11:11 AM Thread Starter
Senior Member
 
mmart's Avatar
 
Join Date: Jan 2019
Location: Philadelphia
Posts: 441
iTrader: (1)
 
Pick up Mod question

What’s up all, so like the rest of the country (and most of the world) I don’t have anywhere to go right now so I figured it’s probably a good time to try and tackle some mods. The first I’d like to do is the pick up coil mod because hot starts are a b-tch. I have a new(less than a year) AGM battery which has improved it, but I still have problems when stopping for gas or at store etc..
I ordered a feeler gauge and a set of diamond burr bits for my dremmel but I still have a question.
I found this thread

https://www.vn750.com/forum/19-elect...ance-pics.html

It’s a really great write up, very detailed, but the only thing I’m unsure of is how to judge the gap measurement. I haven’t popped off the cover plate yet so I haven’t seen this stuff first hand before. Do you just slide the gauge in between the center of the coil (between the screws)and the rotor? Or is there a trick I’m missing. And is it possible to make it too close?
mmart is online now  
Sponsored Links
Advertisement
 
post #2 of 11 (permalink) Old 04-03-2020, 12:38 PM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 7,368
iTrader: (5)
   
Need to measure the gap between the face of the pickup coil and one of the magnets on the rotor.

Line one of the magnets up with the pickup coil, then measure and adjust to the gap you want. The magnet will make using the feeler gauge a little tough, but you can get it.

I don't have the P/U coil or ign. relay mods, but the Two Wire mod improved hot starts on mine.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
Spockster is offline  
post #3 of 11 (permalink) Old 04-03-2020, 01:35 PM Thread Starter
Senior Member
 
mmart's Avatar
 
Join Date: Jan 2019
Location: Philadelphia
Posts: 441
iTrader: (1)
 
Ok, when you say it’ll make it hard, is that simply because we’re dealing with steel and magnets? I was thinking about taking the feeler gauge apart in hopes that the magnet might just hold it in place while I adjusted the coil distance.
mmart is online now  
 
post #4 of 11 (permalink) Old 04-03-2020, 02:52 PM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 7,368
iTrader: (5)
   
Quote:
Originally Posted by mmart View Post
Ok, when you say itíll make it hard, is that simply because weíre dealing with steel and magnets? I was thinking about taking the feeler gauge apart in hopes that the magnet might just hold it in place while I adjusted the coil distance.
Yes, the magnet will put a lot of drag on the gauge.

It might work the way you're thinking, just re-check it after you tighten the screws. I've seen gaps get smaller after the gauge is removed, when setting it tight as you described.

Taking the blades of the gauge apart does help sometimes.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
Spockster is offline  
post #5 of 11 (permalink) Old 04-03-2020, 04:29 PM Thread Starter
Senior Member
 
mmart's Avatar
 
Join Date: Jan 2019
Location: Philadelphia
Posts: 441
iTrader: (1)
 
That’s good to know. I’ll pay attention to that. That “pull” is the same reason I figured it would be better to not break off the nub and burr down the coil itself. With the nub I know it can only go move so far after I put the cover back on.
mmart is online now  
post #6 of 11 (permalink) Old 04-03-2020, 05:17 PM
Super Moderator
 
Join Date: Feb 2013
Location: SW Florida
Posts: 2,531
iTrader: (5)
 
on mine, it took opening the top hole on the pickup, as well as removing the nub to get it down to 0.020 inch.. I didnt grind the nub, I had a pair of diagonal cutters that cut it off right flush. I did use a file on the holes

2005 VN750

Sold 11-27-17
michiganteddybear is online now  
post #7 of 11 (permalink) Old 04-04-2020, 09:19 AM Thread Starter
Senior Member
 
mmart's Avatar
 
Join Date: Jan 2019
Location: Philadelphia
Posts: 441
iTrader: (1)
 
How did the mod improve the performance for you?
mmart is online now  
post #8 of 11 (permalink) Old 04-04-2020, 10:00 AM
Super Moderator
 
Join Date: Feb 2013
Location: SW Florida
Posts: 2,531
iTrader: (5)
 
the 'butt dyno' said it gave me a little more umph, but the real reason was to solve the hot restart problem. it solved it totally (and the AGM battery)

2005 VN750

Sold 11-27-17
michiganteddybear is online now  
post #9 of 11 (permalink) Old 04-04-2020, 11:08 AM Thread Starter
Senior Member
 
mmart's Avatar
 
Join Date: Jan 2019
Location: Philadelphia
Posts: 441
iTrader: (1)
 
Ok good that sounds promising. So the last question( for now at least) that I put in the first post is can it be “too close” and what adverse effects can happen if any.
mmart is online now  
post #10 of 11 (permalink) Old 04-04-2020, 02:22 PM
Super Moderator
 
Join Date: Feb 2013
Location: SW Florida
Posts: 2,531
iTrader: (5)
 
as with any magnetic pickup in any use, gap can be critical. from the factory, the gap on the pickup coils is probably 40-50 thou.. dropping it to 20 seems to be the sweet spot.

I imagine it could change the timing a small amount (degree or 2 max), and possibly the spark duration (if the CDI does multiple sparks per ignition cycle, which I dont think it does). since the insides of the CDI are kinda mystical, we dont really know when the spark is generated during the pulse received from the pickup. it could be leading edge, 'centered/peak' or on trailing edge. the closer the coil is to the magnet, the longer in duration the pulse, and stronger. I believe its the stronger pulse that cures the hot start problems that are not cured by AGM batteries.

when I set mine, I used a metal feeler gauge, of course it stuck to the magnet, but I put the feeler gauge between the pickup and the magnet and set the coil down to the feeler gauge. then I removed the feeler gauge and verified the coil didnt move once I pulled the gauge.

if your off a couple thou I doubt it will make a difference.

2005 VN750

Sold 11-27-17
michiganteddybear is online now  
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