Sparks plugs extremely clean. Running lean? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 12 (permalink) Old 07-06-2013, 09:21 AM Thread Starter
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Sparks plugs extremely clean. Running lean?

After attempting and failing the Pick Up Coil mod, due to those stubborn 3 screws, I decided I would not be defeated so easily and I would at least check the plugs.

The front two plugs look normal, all is good. Then I checked the back two plugs. They were EXTREMELY clean. They looked brand spankin' new. I'm unsure what to think of this, so I started up the bike, and while it was running pulled the boot off one of the rear plugs. Absolutely no change. The bike continued to run the same. I shut off the bike, pulled out a plug, put it in the boot, grounded it, and cranked the bike over again looking for spark. Viola! Spark!

So, the plugs are receiving spark, but what would cause them to look so freaking new? The bike has been ridden for a bit while I've had it, only about 30 or so miles. But the plugs should have some show of wear even if they were new upon purchase... Right?

My next thought is that one of the carbs is running too lean, or maybe completely gunked up... Any ideas?
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post #2 of 12 (permalink) Old 07-06-2013, 09:25 AM
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The bike does not need 2 plugs per cylinder at idle, probably small or no difference.

If in your shoes and by just your description, I would sync the carbs. Then go from there.
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post #3 of 12 (permalink) Old 07-06-2013, 09:30 AM
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Quote:
Originally Posted by AlienBacon View Post
After attempting and failing the Pick Up Coil mod, due to those stubborn 3 screws, I decided I would not be defeated so easily and I would at least check the plugs.

The front two plugs look normal, all is good. Then I checked the back two plugs. They were EXTREMELY clean. They looked brand spankin' new. I'm unsure what to think of this, so I started up the bike, and while it was running pulled the boot off one of the rear plugs. Absolutely no change. The bike continued to run the same. I shut off the bike, pulled out a plug, put it in the boot, grounded it, and cranked the bike over again looking for spark. Viola! Spark!

So, the plugs are receiving spark, but what would cause them to look so freaking new? The bike has been ridden for a bit while I've had it, only about 30 or so miles. But the plugs should have some show of wear even if they were new upon purchase... Right?

My next thought is that one of the carbs is running too lean, or maybe completely gunked up... Any ideas?
three screws...what 3 screws ? You only need to remove the seat & Left Side cover to perform & add the "Coil Mod".

Yeah, Lean is very possibly the problem...(unsure). Have you run some Seafoam thru the carb's ? How well is your bike running...any issues ?


'86 VN750 13,700 mi -Stock
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After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
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post #4 of 12 (permalink) Old 07-06-2013, 09:42 AM Thread Starter
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Yes I have put SeaFoam through the gas.

It's hard for me to say whether it runs well or not. This is my first bike, and I've only had it for a couple of weeks. I can say that it has a very hard time climbing hills with a passenger on. Does not feel like it has quite the power a 750cc engine should have.

Syncing my carbs is something I will do, once I get the sync tool. I'm planning on doing an Ear Shave very soon. (just waiting for all the goodies in the mail). And I will sync the carbs then, but I would consider taking the carb apart now, and cleaning/syncing if it is the most probable suspect.

The three screws I'm talking about are on the Left side of the bike above the Oil Drain plug. Following this procedure:

http://www.scribd.com/doc/34298778/P...oil-Adjustment
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post #5 of 12 (permalink) Old 07-06-2013, 09:48 AM
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Pickup coil's probably.

If you are going to remove the carb's, you really don't need a sync tool. Sync throttle opening.

edit-Pick up coils is in answer the Wm's post.

Last edited by wmsonta; 07-06-2013 at 10:57 AM.
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post #6 of 12 (permalink) Old 07-06-2013, 10:49 AM
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Possibly a plugged jet. Check your air screws too.

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post #7 of 12 (permalink) Old 07-06-2013, 10:53 AM
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also could be that the vacuum tube for the rear carb is off

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post #8 of 12 (permalink) Old 07-06-2013, 12:12 PM
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Just a thought, do you know for certain that it is firing on the rear cylinder? I would start it from cold and feel the two exhaust pipes, up close to the head. If the rear is cold it is not firing. You have verified that you have spark so the next check I would do would be to do a compression check, if that is OK then remove the carbs and strip and clean them.

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post #9 of 12 (permalink) Old 07-06-2013, 12:15 PM
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Quote:
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Just a thought, do you know for certain that it is firing on the rear cylinder? I would start it from cold and feel the two exhaust pipes, up close to the head. If the rear is cold it is not firing. You have verified that you have spark so the next check I would do would be to do a compression check, if that is OK then remove the carbs and strip and clean them.
I would think that if it wasn't firing, the plugs would be fouled?

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Mods
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HD Electra Glide Fairing
Earshave/Coastered/CA emissions - gone...
R/R relocated
Nightster seat
Tombstone taillight
Drag specialties turn signals relocated
Sportster progressive shocks... Dropped rear 1 1/2"
Progressive Fork Springs dropped front 1"
NGK plug wires and iridium plugs
Coil Relay Mod
Paint
ACCT to MCCT
Honda Rebel luggage rack
VN800 Handlebars & controls
Screamin Eagle mufflers
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post #10 of 12 (permalink) Old 07-06-2013, 01:31 PM
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if the plugs are firing but there is no fuel to ignite then they cant foul

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i got my helmet but it sure makes licking the windows a chore

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