Motorcycles from different parts of the world, including Harley Davidson, Japanese brands, and European manufacturers, often encounter issues with spark plug threads. Founded in 1903 in Milwaukee, Wisconsin, Harley Davidson is one of the oldest motorcycle manufacturers globally, known for its iconic V-twin engine design and loyal community of enthusiasts. Japanese motorcycle manufacturers like Honda, Yamaha, Kawasaki, and Suzuki have made significant contributions to the industry, with Honda becoming the largest motorcycle manufacturer by 1964. Japanese bikes are recognized for their reliability, fuel efficiency, and technological advancements. European brands such as BMW, Ducati, Triumph, and KTM have a rich heritage, renowned for their craftsmanship and performance. BMW Motorrad, Ducati, Triumph, and KTM are well-known European manufacturers, each with unique characteristics and specialties.

When it comes to repairing spark plug threads, DenLors Tools provides top-quality kits that ensure reliable and long-lasting solutions for Harley Davidson motorcycles and other brands. In this article, we cover the process of repairing Harley Davidson spark plug threads, addressing common questions along the way. If you need assistance in selecting the appropriate kit, feel free to reach out to us at 800-734-8665.

We understand the frustration of customers who have previously used ineffective parts store kits for spark plug thread repair. Many of these kits fail to withstand the demanding conditions of heat, compression, and vibration, often resulting in spark plug blowouts. It is crucial to avoid common mistakes like using Helicoil, which relies on a wedge tool for insert security. This method is weak and unreliable, especially considering the expansion and contraction the repair insert needs to endure.

At DenLors Tools, we exclusively offer Time Sert kits that utilize superior inserts and installation techniques. These inserts are securely held in place by an installation driver that cold rolls the bottom threads. This unique process expands and spreads the bottom of the insert, providing a robust and durable repair solution. Additionally, we use permanent red high-temperature Loctite to enhance the insert’s stability further. With our approach, you can expect a reliable repair that can withstand extreme conditions.

Choosing the right kit for your Harley Davidson is crucial, starting with identifying the size of the factory spark plug hole. For many Harley Davidson motorcycles, the common size is metric M12x1.25 millimeters. In such cases, the Time Sert 4212 kit is the perfect choice. However, if you are performing a second-time repair after using an inferior parts store thread kit that caused the hole to become bigger, we recommend the Big Sert kit. Although Time Sert does not offer a specific “Big Sert” kit for M12x1.25mm spark plugs, you can utilize the 5212 kit along with the 52121 insert, considering the available material in the head and the fact that Harley plugs are washer seat, which improves the chances of success.

Now, let’s address some frequently asked questions about repairing Harley Davidson spark plug threads:

Question: I own a 1999 Harley Davidson with Champion 6R12 spark plugs. Will the 4212 spark plug thread repair kit work for my bike?

Answer: Yes, the 4212 kit is suitable for a first-time repair since the Champion 6R12 spark plug corresponds to M12x1.25mm, which matches the kit’s specifications. Don’t forget to purchase the 42123 washer seat insert separately. Other spark plugs sharing the same size as the 6R12 include NGK DCPR7E, DCPR7EIX, Champion RA8HC, DENSO IXU22, Autolite 4163, 4164, and Harley-Davidson 6R12.

Question: Will my motorcycle continue using the same size spark plug after using the Time Sert thread repair kit?

Answer: Yes, the repaired threads will still accept the same size spark plug as before. However, it is crucial to double-check the size before proceeding with the repair to ensure compatibility.

Question: The manufacturer, Time Fastener, mentions that Loctite is only necessary for taper seat plugs, not washer seat plugs. Can I skip using Loctite?

Answer: Technically, you can skip using thread locker if you are using a washer seat insert and plug. However, for added security and peace of mind, we recommend using Loctite as extra insurance. While not mandatory, using Loctite ensures a more secure and reliable repair.

Question: Why is your Time Sert 6020 thread locker more expensive? Can’t I use regular red Loctite that I already have?

Answer: Our 6020 is specifically designed for high-temperature applications. When repairing spark plug threads located in the combustion chamber, the insert threads can reach extremely high temperatures. Regular Loctite, such as 271 and 277, tends to burn away at around 200-300 degrees, rendering it ineffective in this scenario. Our Time Sert 6020, on the other hand, can withstand temperatures up to 500 degrees, ensuring its durability even under extreme conditions. It is worth investing in the right thread locker for long-lasting results.

Question: How does the bottom of the insert get expanded to secure it in place?

Answer: The Time Sert kit utilizes an installation driver that is crucial for expanding the bottom threads of the insert. Unlike other brands that require hammering a cone-shaped tool onto the insert, Time Sert’s installation driver cold rolls the bottom threads. This process not only finishes the threads but also spreads the bottom of the insert, effectively locking it into place. Combined with the application of Loctite 266, this method provides a far superior and secure attachment of the insert to the engine.

In conclusion, repairing spark plug threads in Harley Davidson motorcycles and other brands requires a reliable and effective solution. DenLors Tools offers Time Sert kits with superior inserts and installation techniques, ensuring durability and long-lasting repairs. By selecting the appropriate kit and following the instructions carefully, you can restore the integrity of your spark plug threads and ensure optimal performance for your motorcycle. If you have any doubts or need assistance, our team is always ready to help. Choose DenLors Tools for successful spark plug thread repair without the need to remove the cylinder head.

DOs:

1. DO choose the appropriate thread locker for spark plug thread repair insert. Consider the specific requirements of your application.
2. DO use red high temp thread lockers, such as Time-Sert 6020 and Seal Tite 266, for spark plug inserts. These provide a strong and secure bond that can withstand high levels of vibration and heat.
3. DO apply a modest quantity of thread locker. These anaerobic thread lockers are designed to fill small gaps, so using too much can result in spreading beyond the required surfaces.
4. DO thoroughly clean the threads before applying the thread locker. Removing any contaminants, grease, dirt, or oil will ensure proper adhesion.
5. DO allow the thread locker to fully cure. It is best to wait for 24 hours after application for optimal performance.

DON’Ts:

1. DON’T use blue thread lockers for spark plug inserts. Blue thread lockers are typically low-strength and not suitable for applications that require a secure bond under high vibration and heat.
2. DON’T apply green thread lockers directly to the insert before installation. Green thread lockers are thin and can spread too thinly, leading to insufficient coverage and a weaker bond.
3. DON’T use super glue to hold spark plug inserts. Super glue lacks the vibration resistance required for engine applications and may weaken or fail over time.
4. DON’T apply any thread locker to the spark plug itself. Using thread locker on spark plug threads can make it difficult to remove the spark plug in the future and potentially damage the threads or cause breakage.
5. DON’T assume that thread locker affects grounding. Thread locker on the external threads of a spark plug insert does not prevent proper grounding because it only fills gaps and allows sufficient metal-to-metal contact.

Additional Tips:

1. Apply thread locker on taper seat spark plug inserts and washer seat inserts for additional security and strength.
2. Ensure the thread locker bottle is properly sealed after each use to prevent air from entering and affecting its performance over time.

Remember, it’s important to choose the right thread locker, apply it correctly, and follow the manufacturer’s instructions for the best results in spark plug thread repair insert applications.

We offer a wide range of head bolt thread repair kits that are designed to provide a lasting and effective repair for your vehicle. Our kits made by Time-Sert, are highly recommended by many automobile manufacturers like Toyota, GM, and Honda.

When it comes to repairing cylinder heads, it’s important to preserve the line-up dowels for precise alignment. Some line-up dowels are solid and are not in the head bolt hole. Others are hollow and fit in the head bolt hole. Sometimes guys call these line-up bushings. These hollow type line-up dowels like the ones seen in the image above, ensure that the cylinder head aligns properly with the engine block, which is crucial for the engine’s performance and functionality. That’s why using a kit like Time-Sert, which retains the use of the line-up dowels, is the way to go. Some other brand kits make the hole bigger and eliminate them which seems a bit risky.

Another key factor to consider is the type of inserts used. Time-Sert inserts have fine threads, which offer better strength, precision, and reliability compared to coarse threads. Coarse threads can be weaker, less precise, and more prone to cross-threading during installation. They may also lead to poor sealing and other issues with engine performance.

Now, let’s talk about the advantages of Time-Sert’s approach. Time-Sert uses a smaller outside diameter (OD) insert with finer threads, which has several benefits. First, it removes only as much material as necessary, unlike a one-size-fits-all approach that removes a large amount of the block regardless of the bolt size. This helps prevent cracks or intrusion into oil or water jackets.

The smaller OD insert also puts less stress on the block, reducing the risk of block cracking. It provides a more precise fitment, minimizing the chances of leaks or improper torque settings. Additionally, the finer threads create a larger contact area, distributing the load more evenly and increasing the strength of the repair. This approach also offers greater versatility, accommodating a wider range of thread sizes and types.

Time-Sert’s “timed” and synchronized threads are unique. These “Timed” insert feature ensures precise thread engagement, better load distribution, improved torque retention, and easier installation. The threads engage at the same time, creating a secure and stable connection. They distribute the load evenly, reducing stress on the threads and the surrounding material. This leads to better torque retention and a more reliable repair. The installation process is also smoother and less prone to cross-threading or other installation issues.

Lastly, let’s discuss the self-locking feature of Time-Sert. During installation, the bottom internal threads of the insert are cold rolled, which expands the mating external threads into the base material. This self-locking design ensures that the insert remains securely in place, even in high-stress applications like cylinder heads or engine blocks. It provides a more secure and reliable repair compared to inserts that only bottom out in the hole. Those inserts without self-locking mechanisms may be prone to backing out or coming loose over time, leading to leaks, loss of torque, or even engine failure.

So, to summarize the benefits of Time-Sert thread repair kits for cylinder head bolts: they retain line-up dowels for precise alignment, use inserts with fine threads for better strength and precision, feature a smaller OD insert with finer threads for a more secure and effective repair, offer timed and synchronized threads for improved engagement and torque retention, and provide a self-locking mechanism for a reliable and long-lasting repair.

When it comes to head bolt thread repair, don’t settle for just any kit. Removing cylinder heads is very time consuming. Using a sub-par thread repair kit just doesn’t make sense. That’s why after researching and weighing the differences, most guys choose Time Sert since it’s a trusted brand. If you have any questions or need assistance, our team is ready to help. Just give us a call at 800-524-9783 or use our Contact Form to get in touch. Remember, a wise repair is a lasting repair!

Hey everyone, Dennis Bandy here. Today we’re going to talk about something that every car owner dreads – damaged spark plug threads. If you’re like me, you know how frustrating it can be when you have to deal with this issue. Sometimes things happen and we just have to deal with them, today I’m going to tell you about the top 3 spark plug thread repair kits for Honda vehicles.

Now, you might be thinking, “Dennis, why should I trust your opinion on this?” Well, let me tell you – I’ve been working on cars for over 30 years, and I’ve seen it all. And when it comes to spark plug thread repair kits, there’s one brand that stands out above the rest – Time Sert. And lucky for us, Time Sert has three of their best kits available for this repair available here at DenLorsTools.com.

First up, we have the Time Sert 4490 Spark Plug Thread Repair Deluxe Kit. This is the big boy of the bunch, and shops love to have it on hand because it works on both foreign and domestic vehicles. It comes with assorted inserts, so you’re sure to find the one that fits your specific needs.

Next, we have the Time Sert 4412E-111 Standard Spark Plug Repair kit. This one has longer tooling for those hard-to-reach spark plugs, and it comes with washer seat inserts that are most commonly used in Honda vehicles. This kit is great for first-time repairs, and it comes with all the necessary tooling and assorted length inserts to make the repair process as smooth as possible.

But what if the hole has already been repaired and the repair has failed? That’s where the oversize spark plug thread repair kit comes in.

And out of all the kits available, the Time Sert “BIG SERT” 5141E is the one that gets the job done right for bigger holes. This is a big kit, with thick enough inserts to repair holes that have previously been fixed with less reliable inserts. For most Honda’s the 51407 inserts are purchased separately for this kit. The insert is much thicker than the wire coils or even solid inserts found in other kits, and it uses a locking pin and loctite to ensure a secure fit. It also features a self-locking design that expands the bottom of the insert to lock it into place, which is what makes it such a reliable repair option.

So, if you’re tired of dealing with temporary fixes that only lead to more headaches down the road, give Time Sert a try. These kits are the best of the best, and they’ll make sure that your Honda stays on the road for years to come. And if you need help choosing the right kit for your specific needs, don’t hesitate to reach out to DenLorsTools.com at 800-524-9783 or fill out the contact form. We’ve been providing quality tools and repair kits for years, and we’re always happy to help. Thanks for reading, and remember – Use Tools that Make Sense.

If you’re new to our blog, we sell spark plug thread repair kits for Fords. We’ve answered many questions over the years regarding these repairs in our blogs, videos and on the phone (800-524-9783 x-251). Here’s another question from one of our recent customers.

Question – I want to be equipped to fix Ford 3 valve spark plug threads. I see that there are kits for pre 2004 and 2004 up. Is there a master kit for all applications? I am very confused as this is not well documented.

Answer – There’s no master kit. Time Sert 5553 is for 2V engines. For a lower cost alternative see our Calvan 38900 listing. Our Calvan listing also has a more detailed application list.  You’ll see that the 2004 cutoff (switching to 3V from 2V) does not apply to ALL models. The Time Sert 3221 is for 3V Ford engines up to around 2008. The lower cost alternative is the Calvan 39300 which is for 3V engines with M16x1.5 spark plugs. Also, Ford made a change in some models in late 2008’s using M12x1.25. Ford like’s to switch things up! See the M12x1.25 Time Sert 4212H spark plug thread repair kit for that application.

Researching spark plug blowouts? You’re not alone. For more information on our spark plug thread repair kits; like which kit is best for your application see the following article. Ford Spark Plug Blowouts – How to Repair.

Since you’ve found this page, chances are you’re either a Ford owner with a spark plug blowout problem or a mechanic (possibly a shop owner) looking for the best fix for his customer that has a Ford spark plug blowout issue. As you’re finding out, there are many choices and… many prices! Parts stores have the quick temporary fixes. We’ve been helping to make sense of spark plug thread repair options since 2005. We get calls frequently on Ford spark plug thread repairs questions. First time repairs, second time repairs and yes even 3rd or 4th time repairs! Ninety nine percent of the time our kits can fix spark plug threads when others have failed. And when parts store quick fixes fail, they end up making the hole even BIGGER. Read on for more information on permanent spark plug thread repairs or call us for personal assistance in choosing the correct kit for your situation and particular vehicle at 800-524-9783. Read the rest…

DennisB DenLorsTools.com © Summary: This is another question regarding how to drill out a tool like a drill bit which has a hard metal compound. While the Rescue Bit can also break in some cases, it has saved a lot of jobs. The success rate is good if recommendations are followed and common sense prevails.

Question – I broke a 3/16″ drill bit trying to drill out a broke bolt. Should I use your 1/8″ bit? The broken bit is about 1/4″ inside the hole with jagged edges showing, will the rescue bit be able to get the bit out, then the remnants of the bolt? Should I just use an extractor to get the bolt after the rescue bit removes the broken drill bit?

Answer – Usually you go a little smaller than what you’re trying to drill out so you can use a rounding motion, so I’d try the 1/8″. The rounding motion makes the hole a little bigger to reduce binding which could break the Rescue Bit. I’d also start with the reamer end of the Rescue Bit, because it would have less chance of snagging and breaking on the jagged part of the broken drill bit. An extractor could work but as always be careful not to break it! Too much force will break an extractor every-time if the bolt won’t budge. If the extractor idea doesn’t work keep in mind we sell Time Sert thread repair kits that can be used if needed to install a solid inert that allows the use of the same size bolt. Just need to know what size bolt to recommend a kit. In most cases we have over-size kits available, if needed that still uses the original size bolt.

The 1/8″ Rescue Bit can be used in a drill or in a die grinder. We have the 1/8″ Rescue Bit listed with a collet which is the adapter that fits 1/4″ straight and 90 degree air die grinders. It adapts the die grinder so it can use 1/8 accessories, in this case the 1/8″ Rescue Bit. See our Rescue Bits for sale on our main website.

DennisB DenLorsTools.com © Summary: Here’s a common question we get when it comes to Ford spark plug blowouts and which kit to use on 2001 and up Ford RF-1L2E Romeo style heads. Because of the extra step material the spark plug may sit up a little higher if a counterbore is not used. Then there’s the issue with parts store kit like the Helocoil Save-A-Thread kit that commonly fail making the hole bigger, which requires an oversize repair kit. We deal with this all the time. The heads can be saved in most cases if done properly with a good quality kit like the ones we sell.

Read the rest…

DennisB DenLorsTools.com © Summary: We’ve compiled some of the Calvan 38900 spark plug thread repair videos here. Some are from WiseAutoTools.com which is our second website. We’ve been selling spark plug thread repairs since 2005. Calvan 38900 is the 2V kit which is used on many 4.6, 5.4 and 6.8 Liter engines made by Ford. The common spark plug blowout issue has been around quite awhile and surprisingly the issue still persists. Ford starting using the 3V engines in 2004 on some models. The 3V engine uses an M16x1.5 spark plug that doesn’t have the same blowout issue as the previous M14x1.25 spark plugs used in the 2V engines. The 3V spark plugs have a breaking issue when removing. The threads can be damaged though which could indirectly cause a blowout issue if the threads are damaged when changing the plugs. What people don’t realize is that Ford still used the 2V engines that have the common spark plug blowout problem after 2004 in some models. One surprising fact is that the 2V engine was used in the E150 with a 4.6 from 1997 all the way through 2014! See our Calvan 38900 product listing for a full list of vehicles that uses the 2V engine.

Read the rest…

DennisB DenLorsTools.com © Summary: Toyota Camry Toyota Rav4 and Highlanders with the 2.4 four cylinder engine has a very common problem with blown head gaskets due to the aluminum threads in the block failing for the head bolts. The middle three in the back of the head are usually the weak point. However, we recommend installing all 10 inserts to strengthen the threads so that it will be less likely to have a repeat problem. Most of the work is getting the head off, so why not spend a little more time to upgrade all the threads? Below are some of our most common questions when it comes to doing this type of repair. Read on for more information or continue to the TIME-SERT 2200 product listing. Read the rest…