Author Topic: Tuning tip  (Read 737 times)

Online John A

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Tuning tip
« on: September 19, 2021, 12:50:50 PM »
Doc Harley Ďsplains why you should change your spark plugs at 10K miles. Good general information that applies to all  especially with the modern pump gas which he doesnít mention. In the old days it was considered good practice to use a file to restore sharp edges. With modern fuels once the engine has flooded  the plug porcelain gets contaminated, it takes special methods to clean it which is nearly impossible, according to a tech rep from AC and it causes more problems than it cures. Just replace them at 10K miles, something Iíve not been doing, especially if they are expensive  platinum unless Iím chasing a problem. https://youtu.be/Sk7oguB9ApU
John
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Online John A

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Re: Tuning tip
« Reply #1 on: September 19, 2021, 06:33:53 PM »
Unless the plugs are bad.
John
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Re: Tuning tip
« Reply #2 on: September 20, 2021, 07:26:43 AM »
Changing plugs at 10k is a total waste of time and money.
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Online John A

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Re: Tuning tip
« Reply #3 on: September 20, 2021, 09:22:05 AM »
Changing plugs at 10k is a total waste of time and money.
.






Agreed, i posted it because it seemed like there was a spate of posts on rough running and misfires. modern plugs work so well they are often overlooked and I have to convince myself to periodically replace them. 
John
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Re: Tuning tip
« Reply #3 on: September 20, 2021, 09:22:05 AM »

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Re: Tuning tip
« Reply #4 on: September 20, 2021, 01:33:10 PM »
I ran the originals in my gmc over 140k. It was still running as good as it did with the new replacements. Itís amazing how long things last nowadays. When I was in my teens 100k on a car was rare without major work having been done. If you got to that mileage you couldnít hardly give it away much less sell it.
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Online Chuck in Indiana

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Re: Tuning tip
« Reply #5 on: September 20, 2021, 02:43:37 PM »
I was in the pits with Jim Baron while The Kid was changing plugs in the race bike. He told me every time he removes a plug, he puts in a new one. "You can't believe the problems I've seen that were only fouled plugs."
I've gotta agree. They are two freakin dollars..
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Offline sib

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Re: Tuning tip
« Reply #6 on: September 20, 2021, 02:44:59 PM »
My 2021 V7 E5 (850) has iridium-tipped plugs and yet the maintenance schedule requires changing them every 10,000 km (~6200 mi).  This doesn't make sense to me.  If you're going to change them that often, then why use iridium tips?  Any insight will be appreciated.
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Offline Vagrant

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Re: Tuning tip
« Reply #7 on: September 20, 2021, 02:53:31 PM »
Same plug in the V85 is at 18,600 miles. That was probobly intended to have standard plugs.
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Online Chuck in Indiana

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Re: Tuning tip
« Reply #8 on: September 20, 2021, 03:07:27 PM »
My 2021 V7 E5 (850) has iridium-tipped plugs and yet the maintenance schedule requires changing them every 10,000 km (~6200 mi).  This doesn't make sense to me. If you're going to change them that often, then why use iridium tips?  Any insight will be appreciated.

Absolutely. The only real value of iridium is extended life.
Chuck in (Elwood) Indiana/sometimes SoCal

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Re: Tuning tip
« Reply #9 on: September 20, 2021, 04:15:09 PM »
If I was racing I might do things differently but Iím not. Iridium and platinum plugs should last between 60 and 150k. On my bike I look at them when Iím doing a valve adjustment. As long as they look good and Iím having no problems I run them.
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Online pete mcgee

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Re: Tuning tip
« Reply #10 on: September 20, 2021, 06:46:38 PM »
I can understand the 5000mile change spark plugs of yesteryears. Plain sparkplugs, leaded fuel, poor airfiltration ( yes that means you K & N), weakish coil output etc.
Todays iriium plugs are brilliant and rarely wear or fail.
Using these also greatly reduces wear on the threads that hold the plug in, just remember the anti seize. A mk 3 lemans in heavy rush hour traffic in 34 deg heat spitting a live spark plug agaist your leg IS a learning experience and an unwanted distraction.
I recently removed the iridiums from my sons car at 80, 000 km as the manual called for change, all were a good colour all had the standard gap, no they didnt have antiseize OEM fit from new. They could have gone back in with no issues.
So if you run them maybe pull them every 40,000 km and have a look, change if gap is expanding or theres damage.
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Offline malik

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Re: Tuning tip
« Reply #11 on: September 21, 2021, 01:20:10 AM »
My 2021 V7 E5 (850) has iridium-tipped plugs and yet the maintenance schedule requires changing them every 10,000 km (~6200 mi).  This doesn't make sense to me.  If you're going to change them that often, then why use iridium tips?  Any insight will be appreciated.

Do note that it often takes some time for Guzzi to update its manuals. I wouldn't be surprised if some of the info & diagrams in the service manual have not been updated either. Situation normal, commonsense recommended.
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Online SIR REAL ED

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Re: Tuning tip
« Reply #12 on: September 21, 2021, 05:53:52 AM »
I'm putting on my Carnac hat and predicting that spark plug threads are the new oil threads......

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« Last Edit: September 21, 2021, 06:32:56 AM by SIR REAL ED »
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Online blu guzz

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Re: Tuning tip
« Reply #13 on: September 21, 2021, 05:59:27 AM »
my 2020 v85, bought in July 2019 has nearly 18,000 miles.  when i did the 12,000 mile service at about 13,000 the plugs looked fine so they went back in.  they also did not look like iridium or platinum or any other special thing, just like regular plugs.  over the past few thousand miles, it has started to be the slightest bit bulky from a cold start as in you push the button and it runs a little rough for about 20 seconds, or advancing the throttle for a few seconds clears it right up so i may try some fresh ones at the 18,000 service.
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Re: Tuning tip
« Reply #14 on: September 21, 2021, 07:28:54 AM »
I can understand the 5000mile change spark plugs of yesteryears. Plain sparkplugs, leaded fuel, poor airfiltration ( yes that means you K & N), weakish coil output etc.
Todays iriium plugs are brilliant and rarely wear or fail.
Using these also greatly reduces wear on the threads that hold the plug in, just remember the anti seize. A mk 3 lemans in heavy rush hour traffic in 34 deg heat spitting a live spark plug agaist your leg IS a learning experience and an unwanted distraction.
I recently removed the iridiums from my sons car at 80, 000 km as the manual called for change, all were a good colour all had the standard gap, no they didnt have antiseize OEM fit from new. They could have gone back in with no issues.
So if you run them maybe pull them every 40,000 km and have a look, change if gap is expanding or theres damage.
       +1. Well said.
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Offline sib

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Re: Tuning tip
« Reply #15 on: September 21, 2021, 07:52:30 AM »
So, if I'm going to keep running the iridium plugs for a long time, but still remove the plugs to adjust the valves every 6200 miles, then the spark plug washers will eventually flatten and not do their job.  Are there such things as replacement spark plug washers?  Alternatively, is there a way to adjust valve lash without removing the spark plugs?  Again, any advice will be appreciated.
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Offline Murray

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Re: Tuning tip
« Reply #16 on: September 21, 2021, 07:59:25 AM »
The thing that used to kill plugs is no longer a thing, lead bromide in fuel.

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Re: Tuning tip
« Reply #17 on: September 21, 2021, 08:00:12 AM »

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Re: Tuning tip
« Reply #18 on: September 21, 2021, 07:44:37 PM »
FWIW....

https://www.ngk.com/can-old-spark-plugs-be-cleaned
.                                                                          More bs. The give away is the part where they say to let the brake cleaner sit for 10 minutes. Thatís about 8.5 to 9 minutes of doing nothing
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Online SmithSwede

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Re: Tuning tip
« Reply #19 on: September 21, 2021, 08:45:47 PM »
On my V7 Stone, the plugs look pretty grotty after 10 to 12K miles.  Gap noticeably widened, ground wire rounded, all kinds of brown crap on insulator.  Iím not going to file the ground square, or try to re-gap it.  I change them.  They are cheap.  And sure enough, it runs better with fresh plugs. 

In my opinion, you can save money not changing the oil filter so often.  Once every second or third oil change (12 to 18K miles) is fine. 

Same for air filter.  Unless you live 20 miles down a dirt road, Iíd run the air filter for 30 to 40K miles. 

In contrast, I like good spark. 
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Online Chuck in Indiana

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Re: Tuning tip
« Reply #20 on: September 22, 2021, 03:39:23 PM »
On my V7 Stone, the plugs look pretty grotty after 10 to 12K miles.  Gap noticeably widened, ground wire rounded, all kinds of brown crap on insulator.  Iím not going to file the ground square, or try to re-gap it.  I change them.  They are cheap.  And sure enough, it runs better with fresh plugs. 

In my opinion, you can save money not changing the oil filter so often.  Once every second or third oil change (12 to 18K miles) is fine. 

Same for air filter.  Unless you live 20 miles down a dirt road, Iíd run the air filter for 30 to 40K miles. 

In contrast, I like good spark.
Spoken like a high miler..  :thumb: and although I don't do your kind of miles any more, I agree.
Chuck in (Elwood) Indiana/sometimes SoCal

02 Scura RC
87 AeroLario
95 Skorpion tour
 
I think senility is going to be a fairly smooth transition for me..

Offline Mr Revhead

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Re: Tuning tip
« Reply #21 on: September 24, 2021, 03:48:05 AM »
Something to note, you can't tell how good a plug is just by looking at it. You have no idea I'd the resistance has climbed.
Higher resistance means the coils have a harder life. The number one cause of dead coils in modern ignition is plugs and leads not being changed enough and making them work harder


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