DOC HARLEY: WHY CHANGE SPARK PLUGS

Welcome to the Service Clinic at Low Country Harley-Davidson with Doc Harley! Here The Doc talks about why you should change spark plugs.

[@roryolson61]

I just changed plugs and wires yesterday. I went with stock plugs and Symax 8mm red wires. My 96 ci 07 FXSTC has a Stage 1 mod. I gapped the plugs to 38 as Doc recommended. Test ride was AWESOME. She definitely runs better and responded quicker. The plugs I pulled were about 43 so at the max gap. Thanks Doc for YOUR infinite wisdom!

[@darrenoliverio7259]

I own an aftermarket shop...this guy is just good, I have my customers go to youtube while we are working on their bike.Plus he is articulate.

[@bddawson9139]

Going to get spark plugs from the dealership right now thank you for sound advice and taking the time out to do these videos they greatly help us who aren't professional mechanics but can at least do minor repairs and upgrades

[@duanesifuentes4129]

Thank you Doc, I was getting tired of different dealerships telling that it's normal on a 2 month old bike. 2021 streetbob with 8200 miles on.

[@donwaltman4276]

Your dad sounds like a smart man, he taught you well. Now you get to teach us a thing or two about Harleys. Great video Doc, see you next time!

[@LowCountryHarleyDavidson]

Thanks 👍

[@fxrmike5145]

It amazes me how many people don't know how to do simple maintenance. Thanks for helping the world be a little bit more aware of proper care of their scooters

[@Wooley689]

Great info. Thanks. Don't forget about the crush washer, needs replaced when you dress the plug and adjust the gap if you reuse the same plug.

[@milosdad1]

Wow! Got me thinking, 35,000 miles and don’t remember ever having them changes. Thanks

[@russl4294]

When you change your front tire change your spark plugs too.Thanks for the information, it's right on.

[@buttheyreinvestmentsdear3132]

Russell Linthicum this is true. I just bought a 2005 Sportster, with 11,000 miles on the clock, on the original front tyre. I’ve just replaced the tyre and the plugs too. Not too sure whether 15 years is a very good service interval though. 🙂

[@paulstanier9736]

NGK spark plugs feature what is known as ‘trivalent plating’. This is a silver-or-chrome coloured finish on the threads that is designed to provide corrosion resistance against moisture, chemicals and weathering. The coating also acts as a release agent during spark plug removal. NGK spark plugs are installed at the factory dry, without the use of anti-seize. NGK tech support has received a number of tech calls from installers who have over-tightened spark plugs because of the use of anti-seize. Anti-seize compound can act as a lubricant altering torque values up to 20 percent, increasing the risk of spark plug thread breakage

[@LowCountryHarleyDavidson]

Thank you for sharing this important information. I am concerned about steal going into aluminum without lube🤷‍♂️…Doc

[@martinelectraglide8490]

It's not a bad idea to have some antiseize compound on the thread of the sparkplug, but you have to compensate for the torque-value. This is a good advice you gave. Thank you for sharing your experience and background story. 👍👍👍👍👍. Greetings from The Netherlands

[@robertspencer2917]

Thank you for sparkplug tips. My 103 has a stage one kit currently which has been tuned at Harley Davidson so I recently changed my sparkplugs on my 2015 Ultra Limited to Screaming Eagle sparkplugs and also upgraded my plug wires to the Screaming Eagle plug wires. Hoping for a little more performance until I go to the next stage 2 kit.

[@unclemikeb]

As always, Doc, you are awesome. You make it seem so clear and sensible when you explain issues.

[@LowCountryHarleyDavidson]

I appreciate that....Doc

[@Nonnodi9]

My Ultra Limited was getting hard to start at 14,000+ miles. Initially thought it was the battery as it is the original battery on a 2016. Decided to put in new plugs and what a difference. Bike fires right up and the power on the road is back. I didn’t realize the amount of power loss the old plugs were causing. I’m going to go with Doc’s advice and replace the every 10,000 miles from here on out.

[@joegreer8760]

Doc, thanks so much! My bike has had a hiccup every once in a while lately. I’m checking the spark plug when I get home

[@jimscycleandautotn8508]

and survey said ?

[@TheTaino320]

Doc, thank you for your video. They are an excellent source of sound advice. Keep them coming.

[@scrumthebum2451]

Going on a trip with my 2015 road king. While checking everything the stock 6r12 plugs have about 10,000 on looked good but I had another set of fancy iridium plugs in the toolbox. Tossed them in and bike started better & idled better. Wasn’t even gonna change them but glad I did

[@scottthornton9237]

Great tip, with common sense. The good old school tune up: Plugs, Oil and Filters. I suppose we have done away with points by now but, My old 1980 FXRS80 had points.

[@alanrainey8081]

Hi Doc I agree with you, especially for people changing their own. Better performance for less than the price of a value meal, why not? My only thing is my bike has NGK plugs and after talks to NGK they told me no anti-seize because their plugs already have a coating. So I would say check to see if your plugs have a coating before adding anti-seize, could cause you problems over torquing the plugs

[@anthonyraffaele1982]

Great advise... this video gives you great details on the basic spark plug install . .little steps in this video add up to the proper install . . . no more ' hick' ups'.... thank you

[@dextersuarez9948]

Got 15k on my 2020 and haven’t had a single issue starting it, however it’s been in storage for 6 months (I’m deployed) so I went ahead and bought a new battery, spark plugs and wires. Thank you for the explanation, I almost forgot about swapping them.

[@LowCountryHarleyDavidson]

Thanks for sharing and watching our videos...Doc

[@fredorman2429]

When I first looked at the title I said, “Yeah, why change them”. I learned something!

[@bangarang74]

My service manual says change at 20K - My dyna is at 10K right now. I suppose I should check/change my plugs based on this video. Thanks Doc.

[@Tonybfast]

Good information. I change my plugs every 10K miles whether they need it or not. I think my service manual for my 2016 HD Streetglide Special says every 35K miles which makes no since.

[@mannysalazar1124]

I know it’s a 2 year old video but just wanted to add according to the service interval per manufacture specifications on my 15 Road Glide 103HO it’s replace spark plugs every 2 years/30,000 miles which ever comes first. Yes I strongly agree with you keep it simple what you take out is what you put back in .... unless your doing major engine modifications such as altering the compression, etc than it starts to matter.

[@markbarnhill6300]

Correct flame kernel without straining secondary windings is key! Good one Doc! ✌🏻

[@bddawson9139]

I really don't understand what you're saying could you expand on that

[@MrJbrew69]

Thanks Doc! Perfect timing, I’m changing my plugs on my Iron 883 this week 👍👍

[@dalemorigeau1157]

Doc, I know that I am a bit late to everything. I have a 03 fat boy. So I am new . I love it as everyone else does. I want to thank you for your videos. You are giving me a ton of information. No way can I ever thank you enough Sir!!!

[@LowCountryHarleyDavidson]

Thank you for your support Dale....Doc

[@joewhite7252]

Thanks Doc I have a 2019 triglide the reverse stopped and I watched your video and reset the breaker it works fine thanks Joe in Valdosta Ga.

[@almilani4300]

Trikes are the way to go ! I swore I would never ride anything EXCEPT an Electra Glide. I just bought a 2019 Freewheeler and I've never looked back. Motorcycling is fun again and I feel much safer. Especially with my lady on the back !

[@donstewart368]

NGK, gapped at .040, change every 5000 miles. Cant go wrong.

[@TraceyAllen]

There is nothing better than the stock oem plugs. But if I can’t get them, then ngk.

[@getoffmygrass6974]

I change mine every 3-5 thousand and even then I notice a difference. Here in New England the weather changes drastically in a day, plus with a Mikuni you be could be lean today and rich tomorrow, add traffic and heat, it’s a recipe for abuse.

[@dilo777]

My bike has 9k miles on it. Just added a S&S cam and a Vance and Hines exhaust. Been having a very hard time getting it tuned. Pulled the plugs and the gaps were closed (under .020) not sure how that happened but she runs much better with the proper gap

[@gregburgess6884]

Doc your old man was a smart dude. Thanks again doc

[@eddiealvarez5493]

Excellent explanations Doc! That'll keep it runnin right. 👊

[@cyberjack]

grate advice .. spark plugs are so overlooked now days.

[@TheZigster1978]

such an informative video, I needed this info. thank you sir !

[@scottgorman7166]

Doc I could not have said it any more clearly. Perfect, plus check your wires for being dried out and the boots over the plug. I alsways change them out at 10K but i use NGK and changed out to Harley Fat Wires. Tech tip...carry a spare set in your bags...what $15.00 to save headaches. No brainer

[@InstrumentalHuman]

Doc....thank you for all your tutorial & how to video's. Spark plug question. 2012 Street Glide,stock 103, just turned 40k miles. I use the factory recommended plugs. On recent 40k service at dealership,tech showed me my 5k mileage plugs installed at 35k service) and very top of outer electrode (ground strap),had white deposit. Bike always ran and performed very well. Center electrode had normal wear,no build up. I changed fueling station,but kept using 93 octane. Tech said cylinders and piston tops look good. Any knowledge on why top of electrode had white deposit? Oil migration? (piston rings? valve stem seal /seats? head gasket?) Should I request a compression test on each cylinder? Is it too much to change plugs every 5k miles now that mileage on bike is climbing?

[@aldobautista7341]

Keep up the great work on all these videos Doc!!! Great feedback, we appreciate you boss 🫡

[@streetpunk99]

He's like the Alton Brown of Harleys

[@mrpink1216]

Spot on dude

[@johncavar2914]

Doc Holiday dude is cool 😎👍🏼🏍 Great tips !

[@murrelldooms7982]

Good info .Spark plugs can be cleaned and gap can adjusted. Riding for over 25 years. Plugs have never been a problem. I only had one ever fail completely. A little maintenance goes a long way . .

[@LowCountryHarleyDavidson]

Great point....Doc

[@harley62t]

One additional comment to spark plug changing is to not over-tighten. It's easy to do. Best is to check the service manual and use a torque wrench. CAUTION: if you use anti-seize as Doc recommended, the torque value in the service manual DOES NOT APPLY. The torque values in the manual are for clean, dry threads with only the oil from manufacture. Anti-seize will cause much higher thread loads by the time the torque value on the wrench is met.

[@clarktferrill]

And ..with the extreme heat the anti seize can get down into your cylinder heads not a good thing.. I base this on car racing if you want your plugs to foul extreme temperatures put some anti seize on them

[@robertgoslin4826]

Doc Harley, One thing you did not discuss was resistor spark plugs. They have a built-in gap also in the ceramic stem. You can’t see that but that gap also wears down and gets round. I usually change mine every oil change. They’re not that expensive and I ain’t doing anything while I’m waiting for the oil to drain.

[@CATmanATL22]

Yes sir great tip . I change mine every year at beginning of the riding season .... I live in the north ....lol

[@peacefulwarrior4078]

Yep do the spark plug replacement at every oil/filter change too 👍

[@yogi2.057]

And do not go to hotter range spark plug tips if your riding style is mostly average speed with the usual blasts for kicks. Like the man said, the lower end of the OEM gap is better.

[@JohnSmith-vb6jx]

Great presentation and advice.

[@radd6564]

Hey VN, when u take something (voltage) it's the same as receiving, Da. don't try to knock what this guy has to say. He takes the time, has the knowledge and his presentation is relaxed and positive. Thanks Doc.

[@thangknowa3288]

Check plug tops, make sure they are tight. Anti seize threads, and a little dielectric grease on plug top and a little in the boot for ease of slip on. Champion Spark Plug Chart shows you how "Spark plugs tell a story", you can find them online, or buy one and stick up in the garage.

[@LowCountryHarleyDavidson]

A good follow up Tech Tip….Doc

[@Mr.Ludwig1386]

I have a 2015 Limited Low. The owners manual says change every two years or 30k miles, whichever comes first.

[@davidfrank2824]

I normally change my spark plugs every 1500 miles or 2000 depending if I'm getting ready to head for bike week. I bought this little case that holds two spark plugs. I have three of them and when I change my plugs I put the old ones in this plastic case. That way if someone else riding with us has an issue I have spark plugs with us so we can get back to riding. The only stuff that I use on my bike is Harley-Davidson parts. I'm not going to name aftermarket brands that I try at the beginning when I purchased my first Harley. The parts that these aftermarket people sell just do not have the same quality that a Harley-Davidson part has. I use their spark plugs I use the oil when I change lights it's always Harley-Davidson. Great video a lot of people just do not think about their spark plugs. Even with the frequency of me changing my plugs I can feel a big difference the next time I ride my bike.

[@mikecianelli9144]

can you tell me where HD. makes their oil ? I don't think so.

[@BusterKitten]

Great tip Doc. plus spark plugs (not talking about the ones that are hyped to boost your HP rating by 50%, or they are so intense they would ignite space shuttle fuel) are so inexpensive, would only make sense to put in new plugs even at 6 to 8 thousand miles. Your Harley's worth it!!!

[@michiganborn8303]

I was wondering the same thing. My old Yamaha Star 950 recommend 8k on the plug replacement but then I got my 2014 Street Glide and the OM said 30k.. Why the big difference? It's still a V-twin design.

[@MONSTER-hl1rt]

They are $4-$10 bucks each depending on brand and where you buy them. Personally I buy the HD silver and change mine with every oil change. But I also ride my bike almost every day, year round. Take care of your ride and it will last longer.

[@balmori.hangarage]

Hey doc how are you? Regarding to your video witch as alway it’s very interesting and teachfully, I would like to ask you, what about the coils? I recently bought a KV tester and yes, I could test my spark plugs from 10 to 40 KV (understanding that any reading between 30-40 KV its a good indication of the coil condition) but I really would like to know your experience about this in case you use it! Once again, thank you very much for “taking me out the savage” and best regards from Mexico! Paco Balmori

[@movingforward6099]

I have a kawasaki concours 14 and still trying to figure out why the service tech said every 4 thousand miles kawasaki want spark plugs checked? Thanks for the info!

[@michaelsorenson9585]

You are very logical and dead on accurate

[@jimeckenrode1271]

may I add one thing to this. When you change your plugs use a torque wrench and set them to the proper torque.

[@alexpiccione610]

and Use anti seize on every spark plug

[@Richard5873]

Do you have a video on how to determine an abs light on my 2010 Limited FLHTK ? If I go thru odometer button it gives P55P66. Is there a scanner I can buy to check abs light ?

[@swiss9632]

Thank you. Makes sense! Will do.

[@anoldmaninthewoods2548]

When I was in auto shop on high school (1000 years ago) I was assigned to rebuild an old Maytag GAS POWERED washing machine engine. The spark plug was dated 1918 and it was a fat little guy. Here's the big thing; it had a little 8-bladed fan on the bottom, NOT the typical spark-gap thing (I'm sure there's a name for it but I don't know what it is) like today. Have you ever seen a spark plug like that? BTW, I had to use it and it still worked like it was brand new!

[@LowCountryHarleyDavidson]

Thanks for sharing. I have a few unique spark plugs but none with a fan…Doc

[@144Jericho]

I appreciate your videos Doc!

[@LowCountryHarleyDavidson]

I appreciate that..Doc

[@rooter_glide9181]

Great video! Learn something everyday

[@thollingsworth4910]

Good video, allot of great info.

[@edharbas4828]

Thanks Doc, any tips is good news. Have to go through your archival tips , if any, on the marvevllous V Rod. In particular the ' do I or don't I remove the air intake shroud ' dilemma. Cheers. Ed Queensland. Australia.

[@LowCountryHarleyDavidson]

I am lacking in the V-Rod videos. If you have any suggestions please send to my Email…..Doc

[@edharbas4828]

Thanks for the reply. I have read that through the removal of the V Rod air box it is possible to achieve a substantial horsepower increase. If so, my dilemma is how would one compensate for the loss of contaminent protection from dust particles that the current sealed system provides so adequately? The above insinuation seems to indicate that the current set-up restricts maximum air flow and hence a loss of power. Could you please throw some light on this theory.

[@alblume3374]

Good video. I notice many Harley riders spare little expense on their "babies". Most NEVER wait until the mileage specified in the maintenance chart, yet every other machine they own they won't replace a part until it breaks. The arguments that "plugs are cheap", "cheap insurance", "why not just replace them?" makes little sense. If a spark plug cannot last more than 2,000 miles, you bought a crap plug! In the video he refers to the fact that Harley has extended the mileage interval for spark plug replacement and that is for a good reason. "Doc Harley" states the plug is exactly the same. I cannot say with certainty that he is incorrect, but as an auto technician I know plugs have evolved immensely over the last few years. He is absolutely correct when he said the electrodes erode and the gap widens, but the metal which was used was steel or copper. THOSE plugs lasted 30,000 miles in a car. Today the mentality of plug design is to treat the 2 electrodes with platinum or iridium. These 2 precious metals are able to sustain much more abuse without wearing down. Sure, a 2 cylinder engine will fire the plug more often than my Dodge pick up V8, but come on, 2,000 miles!!!? I have much better things to do and remember than to change the Iridium plugs in my Dyna every 2,000 miles. If you're bored and want to "FIX" something on your scooter, check the tire pressure against factory recommended psi. I bet they need air.

[@trailerparkcryptoking5213]

He didn’t say change them every 2000 miles........he said 10,000 miles, big difference.

[@ssgill4414]

Thanks for the information

[@harley62t]

Here's why I disagree with a 10,000 mile spark plug replacement. 1. Engines run closer to the stoichiometric A/F ratio, so plugs stay cleaner. 2. Modern engines have higher ignition voltage, making for a hotter spark and easier to jump the gap. 3. We no longer use lead in the fuel, and fuels are better than those of years past. 4. Engines are better built and have lower blow-by minimizing oil burn and resultant plug contamination. I change mine at 50,000 miles...never a hiccup.

[@cptdenny007]

I over looked changing my OEM spark plugs at just under 69K miles. I didn’t notice any performance issues on my then 110” 2015 CVO motor. I plan to change them at 20K miles from now on.

[@Tom-jw1pe]

Love your videos… 🔥🔥🔥changing mine this week jus hit 10k

[@kenbuttone8775]

Doc, I can't Find the gap. Spec for replacement plugs in my service manual. Where do I get that information? Thanks for your help sir.

[@leonidassolomou4051]

Excellent... Thank you sir 👍🏾

[@mountaindew8042]

Good monning Doc-Harley 👍. Have a blessday. 👀👂

[@LowCountryHarleyDavidson]

We appreciate the blessing....Doc

[@tiger.6509]

I watched a video on screaming eagle spark plugs and wires and coil what’s your opinion DOC ? on Change stock to the screaming eagle on a 1200 custom Harley Davidson 2006?

[@Wayz5145]

Thank you for the great videos. Can you do one on installing a charging port on the handle bars for a cell phone?

[@LowCountryHarleyDavidson]

Nice idea. What model were you thinking about?....Doc

[@Wayz5145]

@@LowCountryHarleyDavidson on a 2015 Road King Put a charging port up on the handlebars by my cell phone holder.

[@johnnyturbo8460]

Nice and to the point. 👍

[@carlbernas1220]

Question for you the wife has a 2001 sportster and we need to put the transmission back in the primary. We can get it started in but it’s not seating properly to put the bolts in to secure it. Is there anyway or email that I can get for more info. Been trying to get a video on KZbin but to no avail

[@jimmyp6443]

Agreed ,for all you young guys out there ,try starting a kick start 6 volt FL Panhead with bad plugs .

[@LowCountryHarleyDavidson]

Been there, got the T-shirt and larger right calf.....Doc

[@gregashbysmusic5741]

I have to say. Doc makes a lot of sense.

[@JCunningham21]

did the add a better ignition? How about the old injection system. befor o2. iv been told to only use regular stock HD plugs and wires. not to put the SE plugs and wires on.

[@kevinhaynes47]

Great advice.

[@luisangelpandemonium]

Just awesome ! congrats & thanks

[@colinmikesell1487]

i change plugs every fall when i put the bike away for winter (OHIO) along with all three hole of oil....put on about 6K a year....good insurance...

[@gremlyn1439]

Good info for many. Thanx

[@LowCountryHarleyDavidson]

Thank you Gremlyn….Doc

[@jrjohnson9932]

do you index your plugs?

[@swthomas1911]

Great video and advice. Plugs every 10k miles is cheap insurance. Use the OEM plugs.

[@samdunlap5365]

So I have a 2012 FLHX Street Glide,does it only have 2 plugs the manual I was looking at said it has 4,remove the tank to get the other two ???? Thanks for your answer Sam

[@LowCountryHarleyDavidson]

Your year has a Twin Cam motor with just 2 spark plugs. You have the wrong manual…..Doc

[@MyllekeBas]

Very interesting! Thanks!!!

[@altairmec]

Sir good night, excellent explanation, congratulations on this video I am Brazilian and I am watching your video here in Brazil, I am looking for a video on how to repair the LEDs on the Fat Boy panel, you could make a video about it.

[@LowCountryHarleyDavidson]

Thank you for your suggestion. ~ Doc

[@orestezao]

Doc Harley I am from Brasil we love your videos. On my next trip to usa ill visit your Store, and i would like to takea picture with you.

[@ozziejim8472]

He's a genuine HD tech............ so it's gonna cost ya!! ;)

[@ozziejim8472]

"Highlighted reply" HAHAHAHAH! crack me up!!

[@williams2652]

About $65.00 per half hour, NYC.

[@kenbuttone8775]

Doc, I pu a 2003dyns wide glide with 50+kmiles. I am changing the plugs. But, should I also change the plug wires ? If so, what kind would you recommend? Thanks for your experienced help.you help us hd bike riders so much.

[@LowCountryHarleyDavidson]

Yes, If your bike is carb go with Magnacore or Taylor if your bike is fuel injected go with HD factory...Doc

[@kenbuttone8775]

@@LowCountryHarleyDavidson thanks again doc.

[@josedaniel4725]

My bike isn't at 10000 miles yet but plugs are rusty, so should I clean them or replace them?

[@mikep.541]

Not sure you’re correct on the anti seize torque statement. I twisted a wrench for Cummins, and antiseized every thing that I might see again some day. I always went by torque specs and never pulled a thread.

[@barrysimmons4724]

I drop the torque value by 5 -10 with anti-sneeze.... done it for years on cars, truck & tractor engines and Never fouled a plug with anti-sneeze...

[@earlcowher5262]

On an older Cummings 855 if you torqued the head bolts with never seize you could crack the counter bore. That's one of the reasons they came out with water passage inserts. Torque values only apply with the specified lube

[@brucestark2458]

what advantage would the $20 Screaming Eagle plug, have over to stock, less expensive plug

[@Claytonkurtz]

Just wonder if I should go screaming eagle plugs or standard HD plugs. On a 2008 twin cam Went from a 96 ci to a 103 with Andrews cams high flow intake and pipes. Any advice would be great thanks.

[@LowCountryHarleyDavidson]

Stay with the H-D plugs until you increase the compression ratio with performance heads.

[@sboy1955]

Running 4 plugs on my 2018 Street Glide, so do you suggest the same interval for changes?

[@almilani4300]

Every 10,000 miles is safe and I used to go 15,000 on my Electras. As long as the fluids are clean and at proper levels you are good to go. Dont drink the Harley cool aid.

[@eddythomas5771]

great advice doc..question though.are thed V-fire electrode spark plugs or E3 electrode spark plugs make a difference.in your motors performance?thank you doc.

[@LowCountryHarleyDavidson]

I do not have enough experience using these products to recommend.....Doc

[@greglegend2899]

I have question about an 03 Harley Sportster 1200. How can i bypass the vacuum operated petcock for a manual petcock? Do I need to plug lines on the VOES or carb? Do I remove VOES or just leave it? Not sure if you would know how, but I appreciate any feedback.

[@LowCountryHarleyDavidson]

Please keep your VOES. Use on of the existing hoses to go from the carb to the VOES. Eliminating the "T" to the original fuel valve.

[@danield831]

Thanks for yet another helpful video!! I have a question I live in a cold weather climate and store my bike outdoors. I removed the battery from my Sportster 1200, so that the cold weather does not drain it. If I keep it indoors at room temp do you think I still need a trickle charger/battery tender? My gut tells me yes. What do you think?

[@LowCountryHarleyDavidson]

I agree with your gut. The modern battery tender monitors the battery and keeps it in peak condition without overcharging. It will be ready for riding season 👍 Thanks ~ Doc

[@danield831]

@@LowCountryHarleyDavidson I'm going with you and my gut then!! Thanks Doc!!

[@mikebarron5805]

Daniel D & Doc, Food For Thought. Batteries stor best at temps. between 38 & 48° F. Your battery tender won't work as hard either.(Not that it's straining at room temp. ☺) For lead acid batteries the key is in the UN-Diluted Electrolyte. If you've added water to your battery then everything changes. My "battery charger" has a 1.5 Amp float cycle and a 3.0 Amp charge cycle. I don't need it often & it takes most of the night to charge a dead battery but my batteries last a long time and I haven't cooked the life out of one since I quit using 10+ Amp chargers. 🤷‍♂️

[@quantumindicesfuturestrade6873]

Getting on it today

[@michaelsweeney6596]

Thanks for the tip. My gas mileage is down 10 % and I am near 10k ( 2019 sport glide) should I up grade my spark plugs from harley? Thanks again

[@LowCountryHarleyDavidson]

Don’t go for the gimmick 4 prong plugs! First install new H-D Spark plugs and gap them at .042. This could deliver a big fat spark if your Fueling is correct and add a few MPG. If you want to experiment, please do the research and choose wisely. A plug made of better material is my first requirement. Thanks ~ Doc

[@fwschnaar3179]

Thumbs Up....Late to this this Show Doc, but catching up on your Videos.... Thoughts on the Coil ? 🤔

[@LowCountryHarleyDavidson]

The "coil" is often forgotten till it fails. A coil works just as hard as spark plugs and wires. I suggest replacement between 30K-50K miles. ~ Doc