Firing on one cylinder only : V-Twin Forum: Harley Davidson Forums
» Sponsors

» Insurance
Go Back   V-Twin Forum : Harley-Davidson Motorcycle Forums > Technical Discussion Forums > Evolution Engine Technical Discussion
New User? Register Forgot Password

Reply
 
LinkBack Thread Tools Display Modes
Old 09-26-2009, 12:48 AM   #1 (permalink)
IronButt
 
gsxrboy96's Avatar
 
Join Date: Aug 2008
Location: Backwoods Illinois.
Posts: 578
gsxrboy96 wants to know where he is and how he got here
Firing on one cylinder only

Finished the motor in my buddys bike tonite, fired it up, its only hitting on one cylinder, no fire to the front cylinder, checked plugs, plug wires and volatage to coil.....everything checks out ok, can a coil go bad to where it only fires one cylinder? also bike has a crane hi4 box on it, so i dont know if it could be bad, bike ran fine before tear down? any suggestions would be helfpul. thanks chad.
gsxrboy96 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 09-26-2009, 01:41 AM   #2 (permalink)
Premium octane member
 
TXCHOP's Avatar
 
Join Date: May 2004
Location: Downstate NY
Posts: 7,380
TXCHOP wants to know Dino or Syn?
Without knowing more about the bike, check compression in both cyls first, than work from there. Check all connections and plug gaps,etc...
__________________
S&S T124
TXCHOP is offline   Reply With Quote
Old 09-26-2009, 08:24 AM   #3 (permalink)
Lifetime Premium
 
Black Magic's Avatar
 
Join Date: Apr 2006
Location: Arizona
Posts: 519
Black Magic wants to know Dino or Syn?
Wiring most likely.
__________________
Black Magic is offline   Reply With Quote
Old 09-26-2009, 08:38 AM   #4 (permalink)
IronButt
 
gsxrboy96's Avatar
 
Join Date: Aug 2008
Location: Backwoods Illinois.
Posts: 578
gsxrboy96 wants to know where he is and how he got here
Have checked continuty in all the wires, and the motor is fresh, its a clearly visible that there is no spark to the front cylinder.
gsxrboy96 is offline   Reply With Quote
Old 09-26-2009, 07:11 PM   #5 (permalink)
Premium Member
 
Join Date: Aug 2008
Location: Iowa
Posts: 357
rcsoftail wants to know Dino or Syn?
Are you running single fire or dual fire. The crane hi4 will do both. You can tell if your coil has 2(dual) or 3(single) terminals for the ignition wires.
rcsoftail is offline   Reply With Quote
Old 09-27-2009, 09:11 AM   #6 (permalink)
IronButt
 
98 FLHX's Avatar
 
Join Date: Nov 2008
Location: St. Louis, Missouri
Posts: 365
98 FLHX wants to know Dino or Syn?
A buddy of mine just had his ignition module go out on him on a
ride to the Lake of the Ozarks. Only hitting on one cyl.
I believe it was a Crane system.
Replaced the ignition, and it's all good...used the same coil he had.
__________________

"Si Vis Pacem, Para Bellum"
______________________

10:1 JE Pistons
Heads by GMR Performance
Ness Big Sucker
Mikuni HSR 42
V-Thunder 3040 Cam
Dyna 2000 Ignition
Thunderheader

_______________________
98 FLHX is offline   Reply With Quote
Old 09-27-2009, 03:36 PM   #7 (permalink)
Premium Member
 
Join Date: Aug 2008
Location: Iowa
Posts: 357
rcsoftail wants to know Dino or Syn?
You can check you coil using an ohm meter. Check between the neg and pos terminal and it should be 3 ohms. If it is single fire, the center terminal is the positive and you will have to check both negative terminal with each being 3 ohms.

You can also check the ohms between the spark plug terminal and the negative terminal. Can't remember the exact ohms, but it is in the thousands. If dual fire, check both spark plug terminals separately against the same neg terminal. If single fire, check each spark plug terminal against the appropriate neg terminal. The readings should be similar.

If you are running single fire, you can run a jumper wire from the front cylinder neg terminal to the rear cylinder neg terminal, remove the rear cylinder wire that goes to the ignition module and then switch the ingnition module to dual fire. If you saved your factory ignition module, plug it in and give it a try.

Also try switching the rear spark plug with the front spark plug to make sure you don't have a bad spark plug.

You can also check your plug wires with an ohm meter to make sure they have continuity and are similar in reading.
rcsoftail is offline   Reply With Quote
Old 09-27-2009, 03:38 PM   #8 (permalink)
Premium Member
 
Join Date: Aug 2008
Location: Iowa
Posts: 357
rcsoftail wants to know Dino or Syn?
Found a link for checking a coil. It's for an automotive coil, but principal is the same.
http://www.classictruckshop.com/club...e/ignition.htm
rcsoftail is offline   Reply With Quote
Old 09-28-2009, 07:18 AM   #9 (permalink)
IronButt
 
gsxrboy96's Avatar
 
Join Date: Aug 2008
Location: Backwoods Illinois.
Posts: 578
gsxrboy96 wants to know where he is and how he got here
Changed out the coil and all is well, turns out that crane sold out to s and s. and almost everything is made overseas now...went with a dyna tec ignition coil... thanks for the help.
gsxrboy96 is offline   Reply With Quote
Old 09-28-2009, 03:08 PM   #10 (permalink)
IronButt
 
Join Date: Jul 2008
Location: NW AR
Posts: 377
Dr.Hess wants to know Dino or Syn?
Another ignition problem tracked down to Crane. They didn't sell out to S&S, S&S bought what they wanted after Crane went bankrupt. Why did they go bankrupt? Well, selling stuff that broke all the time sure didn't help, but mostly, from what I've seen, because a bunch of bean counters played games with it, bought the company, sold the assets off, leased them back, blew the dough and bankrupted whatever was left over of a 50 year old company. Welcome to America in the 0's.

Glad your buddy got his system fixed. A lot of people like the Dyna systems these days.
__________________
Dr.Hess
1986 FLHT: S&S carb, Andrews EV1
1987 XLH Hugger (Wife's): MegaSquirt Fuel Injection
"71"


Dr.Hess is offline   Reply With Quote
Old 05-26-2013, 11:36 AM   #11 (permalink)
FNG :)
 
Join Date: May 2013
Location: Southern New Mexico
Posts: 2
joust124 wants to know Dino or Syn?
just wanna put my 2 cents in, I had the same problem, intermitent fire on front cylinder at first and then none at all. I checked all wiring etc as advised and everything checked fine. I even measured the 3 ohms on my coil as rcsoftail suggested and it was also there. But when So I started my process of elimation. I first replaced my coil and I had my fire back. With the bike now running I checked my regulator from the battery and it was fluxurateing with the RPMs. So I replaced it. Maybe thats what caused my coil to go out!
joust124 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

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
Trackbacks are Off
Pingbacks are Off
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 03:42 AM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
(C)2001-2012 V-twinForum.com All Rights Reserved (C)2001- V-twinForum.com All Rights Reserved
Motorcycle News, Videos and Reviews
Honda Grom Forum Harley Davidson Forum Honda 600RR Kawasaki Forum Yamaha R6 Forum Yamaha FZ-09 Forum
1199 Panigale Forum Roadglide Forum Honda CBR1000 Forum Vulcan Forum Yamaha R1 Forum Yamaha R3 Forum
Ducati Monster Forum Harley Forums Honda CBR250R Forum ZX10R Forum Star Raider Forum Yamaha Viking Forum
Suzuki GSXR Forum V-Rod Forums Honda Shadow Forum Kawasaki Motorcycle Forum Star Warrior Forum KTM Duke 390 Forum
SV650 Forum BMW S1000RR Forum Honda Fury Forum Kawasaki Versys Forum Drag Racing Forum Ducati 899 Panigale Forum
Suzuki V-Strom BMW K1600 Triumph Forum Victory Forums Sportbikes BMW NineT Forum
Volusia Forum BMW F800 Forum Triumph 675 Forum MV Agusta Forum HD Street Forum Suzuki GW250 Forum
Yamaha Motorcycles Victory Gunner Forum Honda Vultus Forum HD LiveWire Forum