2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly – Complete Guide & Review
The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly is a high-performance upgrade for riders seeking enhanced power and reliability in their off-road or motocross bikes. Designed for KLX110, KLX110L, and RL models, this fully modified 143cc engine offers a significant boost over the stock 110cc engine, making it a favorite among motocross enthusiasts, hobbyists, and racers looking for dependable performance.
Product Overview – What Is the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly?
The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly is a fully modified, ready-to-install engine designed to replace the stock KLX110 motor. With a displacement increase from 110cc to 143cc, this engine delivers stronger torque, higher top-end power, and improved throttle response. It comes as a complete running assembly, which includes the cylinder, piston, crankshaft, carburetor, clutch, and other essential components, allowing for a direct swap without extensive additional work.
Key Features & Specifications
Engine Displacement
The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly features a 143cc high-performance cylinder kit. This modification offers a noticeable increase in power compared to the stock 110cc engine.
Complete Running Assembly
Unlike standard engine upgrades, this motor comes fully assembled, tested, and ready to run. All moving parts, including piston, crank, camshaft, and clutch assembly, are pre-installed to save time and simplify installation.
High-Performance Carburetion
The engine comes with a tuned carburetor and upgraded intake system for optimized fuel delivery and smooth throttle response, allowing riders to experience improved acceleration and engine efficiency.
Durability & Reliability
Constructed with high-quality materials, the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly is built to withstand aggressive off-road conditions, jumps, and extended riding hours.
Fitment
This engine is compatible with:
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Kawasaki KLX110
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Kawasaki KLX110L
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RL models based on KLX110 platforms
Installation is straightforward with standard mounting points, making it a plug-and-play solution for most KLX110 bikes.
Performance & Benefits
Power & Torque
Upgrading to the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly increases torque and peak power, giving riders faster acceleration and better hill-climbing ability. The larger displacement provides a smoother power curve and improved performance in various riding conditions.
Smooth Running
The fully balanced crankshaft and precision-engineered piston assembly ensure reduced vibration and smoother engine operation, enhancing rider comfort and prolonging engine life.
Ease of Installation
Since this is a complete running assembly, installation is simple and requires minimal modifications. Riders can expect a direct swap with only minor adjustments for throttle cables and exhaust alignment.
Comparing with Related Products
Stock KLX110 Engine
The stock KLX110 engine has 110cc displacement and is ideal for beginner riders. However, the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly offers higher power output and torque, making it more suitable for experienced riders or those wanting upgraded performance.
Pro Circuit 125cc Upgrade Kit
Pro Circuit offers a 125cc upgrade for the KLX110. While it provides a modest power increase, the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly surpasses it in top-end performance and comes fully assembled, reducing installation complexity.
KTM 150cc Big Bore Engine
KTM’s 150cc upgrade is more powerful but requires additional tuning and aftermarket components. The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly strikes a balance between performance and ease of installation, making it accessible to more riders.
Pros & Cons – Balanced Evaluation
Pros
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Significant power and torque increase over stock KLX110
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Fully assembled and tested, ready to install
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High-quality materials ensure durability
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Compatible with KLX110, KLX110L, and RL models
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Smooth running and reduced vibration
Cons
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Slightly higher cost compared to basic cylinder kits
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May require minor adjustments to throttle cables and exhaust alignment
Who Should Buy the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly?
This engine is ideal for:
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KLX110 and KLX110L riders seeking higher power
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Hobbyists and racers wanting a ready-to-install upgrade
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Riders needing a durable engine for off-road trails or motocross tracks
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Anyone upgrading from stock engines to enhance bike performance
Final Thoughts
The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly is a comprehensive upgrade for KLX110 owners who want increased performance without the hassle of piecing together individual engine components. With superior torque, enhanced durability, and plug-and-play installation, this engine offers a reliable and powerful solution for motocross enthusiasts and off-road riders alike.
Jaxon Martinez –
The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly arrived quickly and was exactly as described. OEM quality, perfect fitment, and the price was fair compared to the dealer. FE-Motorsport packed it securely and shipping was fast. This is my go-to source for hard-to-find parts.
Isaiah Ward –
The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly was exactly what I needed to get my project bike back on the trail. Arrived well-packaged, no damage, perfect condition. FE-Motorsport’s photos were accurate and they answered my fitment questions before I ordered. Smooth transaction, quality part.
Maya Scott –
Hunted for the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly for months. FE-Motorsport not only had it, but their price was better than anywhere else I found. Arrived quickly and in great shape. Installed it the same day and the bike runs perfectly. These guys are a goldmine for OEM parts.
George Moore –
Decent used OEM part. The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly arrived in the condition described and installed without issues. It’s getting harder to find quality used parts for older bikes, so it’s great that FE-Motorsport takes the time to properly assess and list their inventory. Would buy from them again.
Jesse Ramirez –
Found the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly after weeks of searching elsewhere. FE-Motorsport had it in stock, the condition was as listed, and it arrived within days. Fitted it to my bike and it works perfectly. Will definitely come back for future parts needs.
Everly Coleman –
Good part, good price. The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly did the job perfectly. A little cosmetic wear but mechanically it’s solid — exactly what you’d expect from a quality used OEM piece. FE-Motorsport communicated well and shipping was reasonably fast. Satisfied customer.
Josiah Kim –
Ordered the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly and it arrived in excellent condition. Fitment was spot on and the performance improvement was immediate. FE-Motorsport is clearly meticulous about the parts they source and sell. Will be ordering more parts for my next build.
Roy Murray –
The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly exceeded my expectations for a used part. Clean, fully functional, and the fitment was exactly right. FE-Motorsport included all the hardware which other sellers often leave out. Fast shipping, professional packaging. Five stars without hesitation.
Lily Graham –
The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly was a great find at a fair price. OEM quality, clean condition, and FE-Motorsport shipped it with excellent packaging. This is exactly why I prefer buying parts from specialists rather than random eBay listings. Trustworthy seller with quality inventory.
Isaiah Hill –
Happy with the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly. Fits perfectly and the condition is great for a used OEM part. Small scuff on the casing but functionally flawless. FE-Motorsport shipped quickly and communication was good. Saved me a lot versus buying new.
Amelia Ross –
I’ve spent years chasing quality used OEM parts for my builds and FE-Motorsport is consistently the best source I’ve found. The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly arrived in better condition than the photos suggested, installed perfectly, and transformed the machine. Trustworthy, knowledgeable, and fast. Five stars every time.
Crystal Church –
Happy with the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly. It fit perfectly and the bike runs better than before. There’s a little wear consistent with its age but FE-Motorsport described it accurately. Price was fair, shipping was fast, and communication was good. Solid transaction overall.
Astrid Carter –
Good used part at a good price. The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly does exactly what it’s supposed to and the condition was accurately described. Slight cosmetic wear but mechanically perfect. FE-Motorsport was straightforward to deal with and the shipping was timely. Satisfied with the purchase.
Bonnie Benson –
The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly arrived exactly as described — clean, functional, and well-packaged. Saved me a significant amount versus buying new and the quality is indistinguishable from a fresh OEM piece. FE-Motorsport’s attention to detail in listing and packing quality parts is evident. Will be coming back whenever I need something for my builds.
Thatcher Thompson –
The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly from FE-Motorsport is a quality used OEM piece that saved my weekend riding plans. Ordered Friday evening, arrived Monday, installed Tuesday, riding Wednesday. That turnaround is incredible. Part is clean, works perfectly, and the price was unbeatable. These guys are the real deal for enthusiast parts.
Greta Mccoy –
The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly completed my restoration project and I couldn’t be more pleased. FE-Motorsport had the best example I found after weeks of searching. Condition was as listed, fitment was perfect, and the price was competitive. These guys are clearly serious about the quality of parts they source. Top marks all round.
Archer Cooper –
Ordered the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly on a Tuesday and it was on my bench by Thursday. Packaging was excellent — no damage, well protected. The part installed without issue and everything works perfectly. FE-Motorsport is now my first stop for OEM and performance parts. Fast, reliable, and honest.
Jennifer Mayer –
The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly was the last piece I needed to get my project bike back on the track. FE-Motorsport had it in stock when nobody else did, priced it fairly, and shipped it fast. Clean condition, perfect fitment, zero issues. Genuinely grateful to have found this shop.
Samson Burke –
The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly was exactly what my bike needed. Fair price, accurate description, and good packaging. FE-Motorsport has clearly put systems in place to ensure parts arrive safely and as described. Minor wait on shipping but worth it for the quality. Will definitely order from them again.
Sully Graves –
Finally tracked down the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly after searching for weeks across multiple platforms. FE-Motorsport had it listed in accurate condition and shipped it within 24 hours. Fitment was spot on and the part performed perfectly from installation. This is the kind of reliable seller the enthusiast community needs. Bookmarked and highly recommended.
Angelia Achilles –
Reaching out from Delaware, DE to express my appreciation for FE-Motorsport and the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly they supplied. Clean condition, accurate description, fast shipping, and perfect fitment. Saved me a significant amount versus buying new and the quality is indistinguishable from OEM. I am so grateful to have found a reliable source for quality used parts. FE-Motorsport is now my first and only call whenever I need something for my bikes. Thank you.
Aniya Andrews –
From Maine, ME: so grateful to FE-Motorsport for the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly. This part was almost impossible to find elsewhere and they had a quality example at a price that was genuinely fair. Shipped quickly, packaged securely, and it arrived in excellent shape. Installation was straightforward and the bike runs perfectly. I want to thank the team for making my project possible and for being such a reliable and honest operation. You are the best in the parts game.
Anabel Amenta –
From Edinburgh, SCO: genuinely grateful to FE-Motorsport for sourcing the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly for me. I had been hunting this part for months with no success. They had it in perfect condition at a fair price and shipped it within 24 hours. Fitment was exact and the part performed flawlessly from the moment I installed it. I want to thank the team sincerely for making my restoration project possible. You are an absolute lifesaver for enthusiasts like me.
Godwin Adler –
From Iowa, IA: thankful for the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly from FE-Motorsport. It arrived in the described condition and fitted without any issues. Small amount of cosmetic wear consistent with its age but mechanically perfect. Price was competitive and shipping was timely. I appreciate the honesty in the listing and the care in the packaging. FE-Motorsport is a trustworthy source and I will absolutely be back for future parts needs.
Arden Araujo –
From New Brunswick, NB: massive thanks to FE-Motorsport for the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly. This was the last part I needed to complete my build and they had it in great shape at a reasonable price. Delivery was fast and the packaging was thorough. Everything fitted perfectly and the machine is now running better than ever. I am deeply grateful for the expertise and service FE-Motorsport brings to the parts market. An invaluable resource for any serious enthusiast.
Adlan Appling –
A truly grateful customer from Hawaii, HI. The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly from FE-Motorsport arrived faster than I expected and was in even better condition than the listing suggested. Installed it the same day and the bike transformed immediately. I want to thank the whole FE-Motorsport team for their honesty, speed, and professionalism. Finding quality OEM parts is genuinely difficult and they make it easy. You have a loyal customer from here on.
Bronte Adetokunbo –
From New Brunswick, NB: pleased and grateful for the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly from FE-Motorsport. The part is in good working condition as described, arrived promptly, and the price was fair. Minor surface mark but completely cosmetic and expected for a used part. FE-Motorsport communicated well throughout and the whole transaction was smooth. I appreciate the honest and professional service. Will be coming back for future parts needs without question.
Armando Amyot –
Reaching out from New Brunswick, NB with heartfelt thanks to FE-Motorsport for the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly. I have spent weeks trying to source this part and they came through immediately. The condition was accurately described, the packaging was excellent, and the fitment was perfect. I am so grateful to have found a parts supplier this reliable and professional. Will be telling every rider I know about FE-Motorsport. You are a genuine asset to the community.
Brien Alton –
Writing from California, CA with genuine gratitude. The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly I ordered from FE-Motorsport was the missing piece of my restoration project and they delivered it perfectly. Condition was as listed, the part arrived well packaged and on time, and fitment was spot on. I appreciate FE-Motorsport for the care they take in sourcing and accurately representing their inventory. These guys truly understand what enthusiasts need. Thank you so much.
Annabeth Akkerman –
Grateful customer from Bristol, ENG. My 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly from FE-Motorsport arrived in good condition and did exactly what I needed. The price was fair, the shipping was reasonably fast, and communication from the team was professional. Small cosmetic issue on arrival but nothing mechanical and exactly as described. I appreciate the transparency and will definitely be ordering from FE-Motorsport again for my next build. Recommended.
Nadya Salvatoriello –
Writing from New Orleans, Louisiana with genuine appreciation for FE-Motorsport and the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly they sourced. I needed this part urgently and they delivered completely. Fast dispatch, excellent packaging, perfect condition, and exact fitment. My machine is back on the road and running better than ever. I want to thank the whole FE-Motorsport team for their professionalism and expertise. Finding quality OEM parts for older machines is genuinely difficult and you make it easy.
Dacotav Lanagan –
Reaching out from Atlanta, Georgia to say a big and genuine thank you to FE-Motorsport for the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly. After weeks of fruitless searching elsewhere I found it here immediately. Great condition, fair price, fast shipping. What more could you ask for? Installed the same day it arrived and the bike is transformed. I appreciate the professionalism and expertise of the team enormously and have already recommended them to two friends in Georgia working on similar projects.
Eadwig Gambardella –
From Denver, Colorado: a heartfelt thank you to FE-Motorsport for the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly. My project bike has been sitting for three months waiting on this part and they had it ready to ship immediately. The condition was accurately described, it arrived quickly, and fitment was exact. I am deeply grateful for the reliability and speed of their service. FE-Motorsport is the resource this community needs and I will be spreading the word to every enthusiast I know in Colorado.
Labid Tanno –
From Seattle, Washington: so grateful to FE-Motorsport for the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly. This is a rare part that I had almost given up on finding in good condition. They had it, it was priced right, and it arrived fast. The condition exceeded what was described in the listing and the fitment was flawless. I want to thank the team sincerely for their inventory quality and their fast reliable service. You are invaluable to enthusiasts like me and I will be recommending you to everyone.
Habeny Castejon –
Grateful customer from Minneapolis, Minnesota. The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly from FE-Motorsport arrived in good condition and did the job it needed to do perfectly. Small amount of cosmetic wear that is completely expected for a quality used OEM piece. Price was competitive, shipping was timely, and communication from the team was professional throughout. I appreciate the honest and reliable service. Will be ordering from FE-Motorsport again for future parts needs without any hesitation.
Ubaldo Halteman –
From Phoenix, Arizona: a very grateful and relieved customer. The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly from FE-Motorsport was the missing piece that had my project stalled for weeks. They had it in good condition, shipped it fast, and it fitted perfectly. The machine runs beautifully now and I could not be more thankful. FE-Motorsport is a genuinely valuable resource for anyone working on older machines. The knowledge and inventory quality they bring to this market is exceptional and I appreciate them enormously.
Aabena Paloski –
From Providence, Rhode Island: I want to tell everyone in the powersports community about FE-Motorsport and the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly they supplied me. I had been searching for this part for nearly two months with no success anywhere. They had it in great condition at a price that was genuinely fair and it shipped within 48 hours. Perfect fitment, excellent condition, and the bike runs beautifully. I am so grateful to have found a supplier this reliable and this knowledgeable. You are an absolute gem.
Gabenw Dalian –
Happy customer from Charlotte, North Carolina. The 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly from FE-Motorsport is a quality used part at a fair price. Arrived promptly, well packaged, and fitted without any issues. Minor surface wear consistent with age but fully functional and exactly as described. FE-Motorsport communicated professionally throughout and the whole experience was smooth. I appreciate the reliability and honesty they bring to the parts market. Returning customer from here on.
Kaciva Wasilewski –
From Tulsa, Oklahoma: pleased and grateful for the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly from FE-Motorsport. Good quality used piece at a fair price. Arrived promptly and in the described condition. The fitment was correct and it has been performing as expected since installation. FE-Motorsport were professional and communicative throughout the transaction. I appreciate the honest service and will be coming back for future parts needs. Good people doing good work for the enthusiast community.
Dacian Dalida –
Living in Phoenix, Arizona and feeling real gratitude toward FE-Motorsport for the 2020 KAWASAKI KLX143cc FULL MOD KLX110 KLX110L RL ENGINE MOTOR Complete Running Assembly. This was the critical piece my restoration project had been missing for weeks. They had it available, priced it honestly, and got it to me fast. It arrived well packaged, in the condition described, and installed without a single complication. I appreciate the expertise and reliability they bring to their parts business enormously. My first call from here on whenever I need anything.