Here's my problem with my other smokin ride ... - SmokinVette.com Forums
Reply
 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 11 (permalink) Old 12-09-2012, 04:03 AM Thread Starter
Smokin 750HP Supercharged Club
 
cor66vette's Avatar
 
Join Date: Aug 2010
Location: Vetteville, FL
Posts: 987
Here's my problem with my other smokin ride ...

When the spark plug wire is snapped onto the plug, nice and snug, the plug doesn't fire, and the bike runs on the front cylinder only. When the wire is hanging on the plug wavy gravy, the plug fires, and the bike runs fine. I tried different wires on the plug, and I tried a different plug, and even though the resistance of the coil tested good with a fluke, I swapped it out anyway with a coil from another bike I have. What do you think?

Oh, here's my "other" ride ...

cor66vette is offline  
Sponsored Links
Advertisement
 
post #2 of 11 (permalink) Old 12-11-2012, 07:27 AM
Smokin 750HP Supercharged Club
 
lostvette's Avatar
 
Join Date: Nov 2010
Location: Naples,Florida
Posts: 836
Did U change the plug ?

A Nitrous Vette is a HAPPY VETTE !
lostvette is offline  
post #3 of 11 (permalink) Old 12-11-2012, 07:50 AM Thread Starter
Smokin 750HP Supercharged Club
 
cor66vette's Avatar
 
Join Date: Aug 2010
Location: Vetteville, FL
Posts: 987
Quote:
Originally Posted by lostvette View Post
Did U change the plug ?
Yep. Plugs, and wires changed out. Coil tested ok. New points, and condenser, also. Re-checked timing- all ok.
cor66vette is offline  
post #4 of 11 (permalink) Old 12-11-2012, 02:11 PM
Smokin 750HP Supercharged Club
 
lostvette's Avatar
 
Join Date: Nov 2010
Location: Naples,Florida
Posts: 836
Quote:
Originally Posted by sting66ray View Post
Yep. Plugs, and wires changed out. Coil tested ok. New points, and condenser, also. Re-checked timing- all ok.
Compression ? Some times the valves need set ?

A Nitrous Vette is a HAPPY VETTE !

Last edited by lostvette; 12-11-2012 at 02:13 PM.
lostvette is offline  
post #5 of 11 (permalink) Old 12-11-2012, 02:43 PM
Super Moderator
 
fishslayer143@yahoo.com's Avatar
 
Join Date: Jun 2009
Location: New Iberia LA
Posts: 9,030
Not familiar with Harleys,I ride a Katana ... but generally, if you hold the plug wire off the plug, making the spark jump the gap, and the cylinder begins to fire, its usually a fouled plug.. either oil or carbon or fuel fouled ... but if you put in a new plug and wire and its still doing it,it would seem to be weak spark
fishslayer143@yahoo.com is offline  
post #6 of 11 (permalink) Old 12-11-2012, 02:57 PM Thread Starter
Smokin 750HP Supercharged Club
 
cor66vette's Avatar
 
Join Date: Aug 2010
Location: Vetteville, FL
Posts: 987
Quote:
Originally Posted by lostvette View Post
Compression ? Some times the valves need set ?
Quote:
Originally Posted by fishslayer143@yahoo.com View Post
Not familiar with Harleys,I ride a Katana ... but generally, if you hold the plug wire off the plug, making the spark jump the gap, and the cylinder begins to fire, its usually a fouled plug.. either oil or carbon or fuel fouled ... but if you put in a new plug and wire and its still doing it,it would seem to be weak spark
The plugs do foul once the bike runs a while- even new ones. The compression seems ok but I do have to actually check it with a compression gauge. I'm leaning towards sticky valves because years ago, for the first ride of the season, the bike would act like this- run on 1 cylinder - then clear up and no probs after that. This time, though it's not clearing up. But why would the plug only fire when the spark jumps across if the valves stick or the compression is weak?

Thanks, gents.

Last edited by cor66vette; 12-11-2012 at 03:01 PM.
cor66vette is offline  
post #7 of 11 (permalink) Old 12-11-2012, 04:43 PM
Super Moderator
 
fishslayer143@yahoo.com's Avatar
 
Join Date: Jun 2009
Location: New Iberia LA
Posts: 9,030
don t know about Harley ignitions, but is there anything similar to the Pick-up coil in a GM distributor? I think its ignition related..
fishslayer143@yahoo.com is offline  
post #8 of 11 (permalink) Old 12-11-2012, 06:08 PM Thread Starter
Smokin 750HP Supercharged Club
 
cor66vette's Avatar
 
Join Date: Aug 2010
Location: Vetteville, FL
Posts: 987
Quote:
Originally Posted by fishslayer143@yahoo.com View Post
don t know about Harley ignitions, but is there anything similar to the Pick-up coil in a GM distributor? I think its ignition related..
Well, I ran a new wire between the points in the distributor and the coil. I swapped the coil with one I know works. I changed the points, condenser, wires, and plugs. Plug and point gaps have been double checked. Timing has been checked and double checked. Ignition-wise, I think I ran the gamut. Tomorrow I check compression, and valves, and seats. Since I don't know what it is, I have to find what it isn't. Thanks for the input.
cor66vette is offline  
post #9 of 11 (permalink) Old 12-12-2012, 05:38 AM
Smokin 1000HP Twin Turbo Club
 
Hotrod's Avatar
 
Join Date: Jun 2008
Location: A.C., NJ
Posts: 1,423
Post

Quote:
Originally Posted by sting66ray View Post
The plugs do foul once the bike runs a while- even new ones. The compression seems ok but I do have to actually check it with a compression gauge. I'm leaning towards sticky valves because years ago, for the first ride of the season, the bike would act like this- run on 1 cylinder - then clear up and no probs after that. This time, though it's not clearing up. But why would the plug only fire when the spark jumps across if the valves stick or the compression is weak?

Thanks, gents.
By leaving the plug wire loose on the plug you are increasing the gap that the coil has to jump across or to say another way you are increasing the voltage output of the coil . Due to the larger gap the coil must work harder to jump across it. Typically when a flooded engine (from gas) doesn't start the mechanic would pull the coil wire away from the dist terminal to increase the coil voltage and usually the extra voltage is enough to get the engine started again. I would check the plugs one more time . Check for incorrect gap, cracked insulators, incorrect heat range or maybe your fuel mix is too rich.
Hotrod is offline  
post #10 of 11 (permalink) Old 12-12-2012, 10:21 AM
Smokin 750HP Supercharged Club
 
lostvette's Avatar
 
Join Date: Nov 2010
Location: Naples,Florida
Posts: 836
Quote:
Originally Posted by Hotrod View Post
By leaving the plug wire loose on the plug you are increasing the gap that the coil has to jump across or to say another way you are increasing the voltage output of the coil . Due to the larger gap the coil must work harder to jump across it. Typically when a flooded engine (from gas) doesn't start the mechanic would pull the coil wire away from the dist terminal to increase the coil voltage and usually the extra voltage is enough to get the engine started again. I would check the plugs one more time . Check for incorrect gap, cracked insulators, incorrect heat range or maybe your fuel mix is too rich.
He only has one cyl. doing that , so He needs to ck the compression !

A Nitrous Vette is a HAPPY VETTE !
lostvette is offline  
Sponsored Links
Advertisement
 
Reply

Share This Thread

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the SmokinVette.com Forums 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









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
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