videos

Go Back   VMaxForum.net > Main Category > VBoost Room

VBoost Room General Bike Discussions

Reply
 
Thread Tools Display Modes

No spark from one coil
  #1  
Old 01-29-2018, 03:40 AM
JpRngr JpRngr is offline
Junior Member
 
Join Date: Jan 2018
Location: Littleton, Co
Posts: 8
My VMax: 1988 Burgundy
Default No spark from one coil

Hey there!
Just picked up an '88 Vmax that was inop. No back history, got it cheap from an auction for a project. Anyway, put a new battery in and am trying to get it running. Found really old, nasty gas and have drained the tank and cleaned it out. Will be pulling the carbs and cleaning them also. In the process of figuring things out, I determined I wasn't getting spark from the left rear coil. If I swap the connectors between the rear two coils, it will spark and the right one won't. So, don't believe it to be a coil issue.

What should I look at next? Saw something on here about checking resistance at a six pin connector and one of them was lower than the others, but don't have the results here right now. Any thoughts or suggestions as to where to look next?


Corey
Reply With Quote
 

Re: No spark from one coil
  #2  
Old 01-29-2018, 06:40 AM
MaxMidnight's Avatar
MaxMidnight MaxMidnight is offline
Senior Member
 
Join Date: Dec 2007
Location: Cumbria, England.
Posts: 1,575
My VMax: 1999, Custom Carbon Fibre
My other bikes: XS650
Awards Showcase
Award of Posting Excellence (APE) Mod Monkey 
Total Awards: 2
Default Re: No spark from one coil

Can we assume you have a wiring diagram?

As three of the coils work then that would rule out the pick-up cpils

I would start by checking that I have power to the coil and if OK check that you have continuity back to the ignition unit.

If that checks out OK then I would suspect an issue with the ignition unit
__________________
Regards

Steve L

"I finally got my head together...now my body is falling apart!"

Mr Max is:
A 1999, 1300cc with Mikuni 40mm TDMR Carbs, gassflowed head, Holeshot headers with custom silencers.
It is kept off the ground by Dymags coupled with Racetech springs and emulators at the front and White Power shocks at the back.
It is slowed down with an ISR radial master cylinder and six pot callipers grabbing onto Braking wave discs.
Reply With Quote
 

Re: No spark from one coil
  #3  
Old 01-29-2018, 06:35 PM
JpRngr JpRngr is offline
Junior Member
 
Join Date: Jan 2018
Location: Littleton, Co
Posts: 8
My VMax: 1988 Burgundy
Default Re: No spark from one coil

No, no wiring diagram. Just got this less than a week ago. Google is my friend! LOL.

Anyway, I'll see about checking resistance in the wiring between the ignition unit and coils. If that checks out and I need a new ignition unit, is a stock replacement recommended or is there a better aftermarket unit I should look at?
Reply With Quote
 

Re: No spark from one coil
  #4  
Old 01-30-2018, 12:19 AM
Fire-medic's Avatar
Fire-medic Fire-medic is offline
Senior Member
 
Join Date: Mar 2011
Location: Miami Florida
Posts: 8,395
My VMax: 1992 Red-E Sparkle
My other bikes: FZR 1000, '67 Superhawk
Awards Showcase
Nice guy award Award of Posting Excellence (APE) 
Total Awards: 2
Default Re: No spark from one coil

Coil over plugs makes an easy job of switching out coils if one goes bad. One of our members sells a kit to replace yours. I believe at this time Sean Morley is acting as a dealer for him. [email protected]

Wire diagrams:

http://www.vmaxforum.net/attachment....7&d=1337010945 for 1990+ USA

http://www.vmaxforum.net/attachment....6&d=1337010945 for '85-'89 USA

Look in the tech section for the service manual.
__________________
"This old thing? Totally-stock! And not runnin' so-well, either!"
Reply With Quote
 

Re: No spark from one coil
  #5  
Old 01-30-2018, 02:59 AM
JpRngr JpRngr is offline
Junior Member
 
Join Date: Jan 2018
Location: Littleton, Co
Posts: 8
My VMax: 1988 Burgundy
Default Re: No spark from one coil

Quote:
Originally Posted by Fire-medic View Post
Wire diagrams:

http://www.vmaxforum.net/attachment....7&d=1337010945 for 1990+ USA

http://www.vmaxforum.net/attachment....6&d=1337010945 for '85-'89 USA

Look in the tech section for the service manual.
Thanks for the help!
Reply With Quote
 

Re: No spark from one coil
  #6  
Old 01-30-2018, 06:14 AM
MaxMidnight's Avatar
MaxMidnight MaxMidnight is offline
Senior Member
 
Join Date: Dec 2007
Location: Cumbria, England.
Posts: 1,575
My VMax: 1999, Custom Carbon Fibre
My other bikes: XS650
Awards Showcase
Award of Posting Excellence (APE) Mod Monkey 
Total Awards: 2
Default Re: No spark from one coil

Quote:
Originally Posted by JpRngr View Post
No, no wiring diagram. Just got this less than a week ago. Google is my friend! LOL.

Anyway, I'll see about checking resistance in the wiring between the ignition unit and coils. If that checks out and I need a new ignition unit, is a stock replacement recommended or is there a better aftermarket unit I should look at?
You can get the service manual here

If the unit is faulty then your choices are OE, Dyna or Ignitech.
However it is most likely to be a wiring or connection fault and if possible I would check the ignition unit by substitution if possible.

As Mr Medic suggests, CoP's are an alternative if you need to replace a coil but that does not seem to be the case here.
__________________
Regards

Steve L

"I finally got my head together...now my body is falling apart!"

Mr Max is:
A 1999, 1300cc with Mikuni 40mm TDMR Carbs, gassflowed head, Holeshot headers with custom silencers.
It is kept off the ground by Dymags coupled with Racetech springs and emulators at the front and White Power shocks at the back.
It is slowed down with an ISR radial master cylinder and six pot callipers grabbing onto Braking wave discs.
Reply With Quote
 

Re: No spark from one coil
  #7  
Old 01-30-2018, 12:26 PM
effingidiot's Avatar
effingidiot effingidiot is offline
Senior Member
 
Join Date: Jan 2016
Location: U.K. A soldier of life,just soldiering throu.
Posts: 313
My VMax: 1994,in a 2001 frame
My other bikes: yamaha tdm 850 3vd
Default Re: No spark from one coil

Any chance of a photo of your project,pretty please.
__________________
Now is the utmost ebb of night,
when mind and body sink.
When lonelyness and gathering fright,
overwhelm us if we think.
Reply With Quote
 

Re: No spark from one coil
  #8  
Old 02-11-2018, 08:30 PM
JpRngr JpRngr is offline
Junior Member
 
Join Date: Jan 2018
Location: Littleton, Co
Posts: 8
My VMax: 1988 Burgundy
Default Re: No spark from one coil

So, got back to fiddling with the bike today. Had decided to take a break from it due to the newly cleaned tank deciding to leak from the sending unit seal after getting it installed. So, that's now leak free and back in. Now, I'm not getting fuel out of the pump. Tried using a water bottle filled with gas fitted directly to the pump, in case it just needed to be primed. Finally got some fuel down to the carbs and got the bike to fire. Reconnected fuel line to tank. Would only idle, anytime I tried hitting the throttle, it would die. Checked spark again and now all coils are firing. Looks like the fuel pump just isn't sucking any fuel. Don't know if pump had pumped anything or if I just squeezed fuel to the carbs from the water bottle. Anyone know for sure how well these pumps suck? Do I need to prime the pump, or should I look at getting a new pump?
Reply With Quote
 

Re: No spark from one coil
  #9  
Old 02-11-2018, 08:31 PM
JpRngr JpRngr is offline
Junior Member
 
Join Date: Jan 2018
Location: Littleton, Co
Posts: 8
My VMax: 1988 Burgundy
Default Re: No spark from one coil

Oh yeah, and no pics yet, as it's all torn apart trying to get it running. LOL.
Reply With Quote
 

Re: No spark from one coil
  #10  
Old 02-11-2018, 11:07 PM
MaxMidnight's Avatar
MaxMidnight MaxMidnight is offline
Senior Member
 
Join Date: Dec 2007
Location: Cumbria, England.
Posts: 1,575
My VMax: 1999, Custom Carbon Fibre
My other bikes: XS650
Awards Showcase
Award of Posting Excellence (APE) Mod Monkey 
Total Awards: 2
Default Re: No spark from one coil

Does it run if switched to reserve?
__________________
Regards

Steve L

"I finally got my head together...now my body is falling apart!"

Mr Max is:
A 1999, 1300cc with Mikuni 40mm TDMR Carbs, gassflowed head, Holeshot headers with custom silencers.
It is kept off the ground by Dymags coupled with Racetech springs and emulators at the front and White Power shocks at the back.
It is slowed down with an ISR radial master cylinder and six pot callipers grabbing onto Braking wave discs.
Reply With Quote
 
Reply

Bookmarks

Tags
coil, spark

Thread Tools
Display Modes

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

Forum Jump



All times are GMT -4. The time now is 07:44 PM.

Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.

MorleyMuscle.com Exactrep
top of page