It is currently Thu Jul 10, 2025 3:08 pm




Reply to topic  [ 25 posts ] 
 Inconsistant Spark plug 
Author Message
MMT Member
User avatar

Joined: Sat Dec 25, 2010 12:33 pm
Posts: 40
Post Inconsistant Spark plug
Apparently my spark plug wire likes to fire when ever it likes to. I discovered this by pulling off the other one and the damn engine died.

After taking it apart and messing around with both spark plug wires it is the one on the starter side. It does have rust on it unlike the other side, but if i pull the boot off it seems to arc pretty consistent. so after putting the boot back on and firing the engine i went ahead revved the engine up and started to try diagnosing it when it goes out. Seems like it has to be in a perfect spot to keep a steady enough fire to run the engine if i pull the other spark plug. And i can defiantly hear a difference when its firing right.

I looked for spots where it could be grounding out but with no luck i even made sure the whole wire was suspended no where near a grounding spot and still acted up. So what im thinking is maybe the rust is causes it, but apparently i cant just change the plug because it molds into that control box that grounds it when the kill switch gets activated.

So the question would be do i just order the whole new assembly or can i take the metal clip at the end off clean the wire up real good and re crimp it? Sorry such a long post just trying to knock out some questions. Thanks for any help.


Wed Oct 19, 2011 5:52 pm
Profile
MMT Elite Member

Joined: Wed Mar 03, 2010 7:00 pm
Posts: 6060
Location: Choudrant, La
Post Re: Inconsistant Spark plug
Us knowing what the motor is may help you.

_________________
CSM Custom 18x42 Battleship with a 36 PD beating you to the hole
My Rig (Old Motor) viewtopic.php?f=5&t=45193

(New Motor) viewtopic.php?f=5&t=54733

Stumps Fear Me


Wed Oct 19, 2011 5:58 pm
Profile
MMT 1000 Club

Joined: Tue Nov 02, 2010 7:11 pm
Posts: 1435
Location: Bayou vista, Louisiana
Post Re: Inconsistant Spark plug
Try setting the gap on your coils. Mine runs on one cylinder at idle am then rev it up and they both fire set the gap and everything was fine

_________________
stage 3 GTR screaming behind the 1848 Garrett Pearce special. GET YOU SOME!


Wed Oct 19, 2011 5:59 pm
Profile
MMT Member
User avatar

Joined: Sat Dec 25, 2010 12:33 pm
Posts: 40
Post Re: Inconsistant Spark plug
sorry, 35 vanguard gator tail, and by coil your meaning spark plug right


Wed Oct 19, 2011 6:20 pm
Profile
MMT Elite Member

Joined: Wed Mar 03, 2010 7:00 pm
Posts: 6060
Location: Choudrant, La
Post Re: Inconsistant Spark plug
The thing the sparkplug wire leads to, right by the flywheel.

I'm not sure on the exact gap for a 35 vanguard, maybe somebody will chime in.


You do not have the required permissions to view the files attached to this post.

_________________
CSM Custom 18x42 Battleship with a 36 PD beating you to the hole
My Rig (Old Motor) viewtopic.php?f=5&t=45193

(New Motor) viewtopic.php?f=5&t=54733

Stumps Fear Me


Wed Oct 19, 2011 6:23 pm
Profile
MMT 1000 Club

Joined: Tue Nov 02, 2010 7:11 pm
Posts: 1435
Location: Bayou vista, Louisiana
Post Re: Inconsistant Spark plug
5 thousandths

_________________
stage 3 GTR screaming behind the 1848 Garrett Pearce special. GET YOU SOME!


Wed Oct 19, 2011 6:25 pm
Profile
MMT Member
User avatar

Joined: Sat Dec 25, 2010 12:33 pm
Posts: 40
Post Re: Inconsistant Spark plug
yes that is the box im talking about, are these known for creating a loose connection? and do we know the exact name or part number? Thanks on the gap on check on that tonight. thanks for the replies so far


Wed Oct 19, 2011 6:40 pm
Profile
MMT Pro Member

Joined: Mon Nov 29, 2010 1:51 pm
Posts: 385
Post Inconsistant Spark plug
I have the same issue with my but it's a 35 vanguard mud buddy and It was on the starter side too I have figured it out yet either.

_________________
35 GTR on Uncle J 18/54


Wed Oct 19, 2011 8:03 pm
Profile
MMT Super Elite Member

Joined: Mon Oct 19, 2009 6:38 pm
Posts: 10201
Location: SETX
Post Re: Inconsistant Spark plug
^^^^^Motors are the same for all manufacturers whether it be mudbuddy, gator-tail, go-devil, and prodrive etc., gap can be set the same!


Wed Oct 19, 2011 8:18 pm
Profile
MMT Elite Member

Joined: Wed Mar 03, 2010 7:00 pm
Posts: 6060
Location: Choudrant, La
Post Re: Inconsistant Spark plug

_________________
CSM Custom 18x42 Battleship with a 36 PD beating you to the hole
My Rig (Old Motor) viewtopic.php?f=5&t=45193

(New Motor) viewtopic.php?f=5&t=54733

Stumps Fear Me


Wed Oct 19, 2011 8:20 pm
Profile
MMT 1000 Club

Joined: Thu Nov 19, 2009 1:46 pm
Posts: 1210
Post Re: Inconsistant Spark plug


Wed Oct 19, 2011 8:22 pm
Profile
MMT Super Elite Member

Joined: Mon Oct 19, 2009 6:38 pm
Posts: 10201
Location: SETX
Post Re: Inconsistant Spark plug
^^LOL i new it, forgot about that, what was i thinking


Wed Oct 19, 2011 8:22 pm
Profile
MMT Member
User avatar

Joined: Sat Dec 25, 2010 12:33 pm
Posts: 40
Post Re: Inconsistant Spark plug
damn go-devils seem to be the topic of every post now-a-days, truly are the devil i suppose now.

But back to the topic, has anyone actually replaced that box before?


Wed Oct 19, 2011 9:06 pm
Profile
MMT Pro Member

Joined: Thu Oct 13, 2011 6:53 pm
Posts: 59
Post Re: Inconsistant Spark plug
set de gap wit a business card! make sure u set it on de magnet, not just de Fwheel.
u'r #1 cylinder will carry de engine, u'r #2 won't... runs fine wit NO load, but won't do chit in de water!
might wanna check u'r flywheel key also


Wed Oct 19, 2011 9:16 pm
Profile
MMT Elite Member

Joined: Wed Mar 03, 2010 7:00 pm
Posts: 6060
Location: Choudrant, La
Post Re: Inconsistant Spark plug
Ive never heard of a buisness card, I'll have to try that.

The fastest way to set it is to loosen the bolts, set the card under the "box" and turn the motor over by hand until the magnet gets to it, it will pull the coil onto it. Tighten the bolts then pull the card or whatever you set it with out and there you have it.

_________________
CSM Custom 18x42 Battleship with a 36 PD beating you to the hole
My Rig (Old Motor) viewtopic.php?f=5&t=45193

(New Motor) viewtopic.php?f=5&t=54733

Stumps Fear Me


Wed Oct 19, 2011 9:22 pm
Profile
MMT Pro Member

Joined: Thu Oct 13, 2011 6:53 pm
Posts: 59
Post Re: Inconsistant Spark plug


Wed Oct 19, 2011 9:25 pm
Profile
MMT Elite Member

Joined: Wed Mar 03, 2010 7:00 pm
Posts: 6060
Location: Choudrant, La
Post Re: Inconsistant Spark plug
dik of coon :lol:
He called it a box so I put it in words he understood hence the " " :lol:



Can we let it slide this time? :(

_________________
CSM Custom 18x42 Battleship with a 36 PD beating you to the hole
My Rig (Old Motor) viewtopic.php?f=5&t=45193

(New Motor) viewtopic.php?f=5&t=54733

Stumps Fear Me


Wed Oct 19, 2011 9:26 pm
Profile
MMT Pro Member

Joined: Thu Oct 13, 2011 6:53 pm
Posts: 59
Post Re: Inconsistant Spark plug
i see y'all still over thinkin; deez 2 bangers!


Wed Oct 19, 2011 9:31 pm
Profile
MMT Elite Member
User avatar

Joined: Wed Jan 14, 2009 7:23 am
Posts: 6233
Location: Tarkington, TX
Post Re: Inconsistant Spark plug
Like Coon said, the business card over the magnet is a Good way to set the air gap from the coil/flywheel. Is the contacts are rusty, clean them with a touch of emery cloth on the coil and the flywheel magnet to see if that helps.

_________________
Bayou Surface Drive
337-351-0362
Tarkington, TX 77327


Thu Oct 20, 2011 6:01 am
Profile
MMT 1000 Club

Joined: Thu Nov 19, 2009 1:46 pm
Posts: 1210
Post Re: Inconsistant Spark plug
This is a timely thread....I am just marking it...carry on...


Thu Oct 20, 2011 7:24 am
Profile
MMT Member
User avatar

Joined: Sat Dec 25, 2010 12:33 pm
Posts: 40
Post Re: Inconsistant Spark plug
Thanks for the input.

New to these motors, so excuse the terminology and retardeness.

Gonna work on it some more today.

If you use oem plugs you shouldn't need to gap them right?


Thu Oct 20, 2011 7:31 am
Profile
MMT Super Elite Member

Joined: Fri Dec 18, 2009 8:10 pm
Posts: 16915
Location: Rowlett, TX
Post Re: Inconsistant Spark plug
Always check the gap. They get banged around pretty good in shipping and are rarely correct.


Thu Oct 20, 2011 7:33 am
Profile
MMT 1000 Club

Joined: Thu Nov 19, 2009 1:46 pm
Posts: 1210
Post Re: Inconsistant Spark plug


Thu Oct 20, 2011 7:53 am
Profile
MMT 1000 Club
User avatar

Joined: Wed Feb 04, 2009 7:50 pm
Posts: 3833
Location: Old East Dallas, Texas
Post Re: Inconsistant Spark plug
Gap range on the coils for a 35 is 0.005-0.007. If you set the gap on the flywheel @ 0.005, when you turn it to the magnet gap will be 0.006 or 0.007. Watch the torque on the coil bolts, you can twist off the heads easily.

_________________
Excel 1851F4 w/ MB35HD+R CDI with a little bit of this and little bit of that


Thu Oct 20, 2011 6:45 pm
Profile
MMT Member
User avatar

Joined: Sat Dec 25, 2010 12:33 pm
Posts: 40
Post Re: Inconsistant Spark plug
check gap on both the coils and spark plugs: at idle i cant pull the port side plug (assuming thats cylinder 2 being it wont run at idle) now if i rev it up and pull the starboard side ( number 2?) it bogs down heavy heavy but will still run, obviously like shit though.

Both sides are firing strong and the same if i arc them over to a ground btw

Back to idle with both plugs, ill pull #2 and you cant hear hint of noise or see an rpm drop, put that one back in pull #1 motor will die.

To me its weird because i have my tach meter hooked up on the #2 spark plug wire (starter side, port side etc) and seems to be reporting the way any others do.

another note to maybe help diagnose things, the #1 cylinder exhaust outlet gets way hotter than the #2 exhaust outlet.

i still run the same mph, with a load and with out, just really aggravating me because this cant be right

any further help greatly appreciated


Sun Oct 23, 2011 5:46 pm
Profile
Display posts from previous:  Sort by  
Reply to topic   [ 25 posts ] 

Who is online

Users browsing this forum: No registered users and 96 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to: