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Spark Plug Boots?

S

sohcfour

Tuned and Synch'ed
Joined
Jan 18, 2011
Messages
41
Location
Milwaukee, WI
I posted this in the thread "Intermittent Firing on Single Cylinder"... I apologize for the duplicate...

I have two of the problems mentioned in this thread. #1, I have poor combustion and hesitation at low loads, and #2, terrible fuel econ in the low 30mpg range.

My 09 8V should have the latest map (068) as well as TB balance and cam recall as I left it at Rosefarm this spring for just that.

I tested the plug caps with the squirt bottle method and unfortunately that was inconclusive. I do have a set of the recommended NGK plug caps coming today, anyway.

A couple questions, then. Should I install the NGK caps anyway, out of precaution? If so, I think I need to clip an inch off the plug wire, right? Anything else I should be looking for as the culprit?

Matt
 
Update: I was letting the bike warm up while I put my gear on tonight, and I could hear an occasional cracking noise. Turns out, when I looked in the plug hole, I could see the spark jumping from the boot to the head. Strangely, I can't see any damage on the boot that would cause this.

At any rate, it seems I should replace my boots. Can anyone confirm that I need to cut a short portion off of the plug wire due to the screw-type construction of the NGK boot?

- Matt
 
sohcfour said:
Can anyone confirm that I need to cut a short portion off of the plug wire due to the screw-type construction of the NGK boot?
Click to expand...
Yes, cut a small portion off, and thread the new ones on. I have a few left for anyone in need of them. $5/per.
 
I can't quite close the loop on this yet because our weather has been to lousy to ride, however...

I cut off the end 1/2in of the plug wires and installed the SB05E NGK plug caps described elsewhere on the board. The bike fired right up and settled in to a good steady idle. I certainly didn't hear/see the zapping which I saw with the OE parts installed.

Strangely, I took a better look at the OE parts and can't see anything that would have indicated there was a problem. Oh well. I can't wait to have a chance to take a ride.
 
I got a chance to ride to work today. Short ride but a lot of low speed and low load. The bike seemed much happier. Good consistent performance compared to the stumbling and popping before. I am still puzzled at why the spark was jumping from undamaged stock boots but for $10 I can't complain too badly.

More riding will determine if it improves my 30mpg average!
 
They use resistor plugs and resistor caps. The electrons will have apretty good incentive to try and find an alternative route to earth. I too have seen sparks arcing to th head from seemingly undamaged caps. At the end of the day the boots are a fragile pain in the arse. The NGK items are a much better bet.

Pete
 
I believe the NGK SB05E are also marked as 5k-ohm aren't they? Are they just made from a more stout material? Is there an inherent need for a combined 10k-ohm resistance in the ignition system... radio interference, basic system performance, etc?
 
Only got about 1800 now after buying it at 1100mi. Kind of a blah summer for riding. I did head over for the Crud Run. A couple weeks ago a friend, my wife and I rode all 3 bikes from my signature up to RA for the AHRMA races. And in july im taking the Griso on the ferry to ride to Vintage Days at Mid O. But my commute is 3mi and I spread my riding over 3 bikes so the miles are slow to rack up!
 
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