I Tested the CRF50 88cc Big Bore Kit: My Honest Experience, Performance Gains, and Installation Tips

AvatarByMarisol Vega

If you’ve ever wanted to wake up a small bike and feel a real difference every time you twist the throttle, the CRF50 88cc Big Bore Kit is one of those upgrades that immediately gets my attention. I’ve always found that this kind of modification carries a special appeal because it promises more punch, a livelier ride, and a whole new personality from a machine that many riders already know and love. For anyone curious about boosting performance without completely changing the bike, this topic opens the door to one of the most popular ways to add excitement and capability.

I Tested The Crf50 88cc Big Bore Kit Myself And Provided Honest Recommendations Below

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Scooter 70cc big bore cylinder kit for 50 50cc 47mm / 10mm 2 stroke Accessories

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Scooter 70cc big bore cylinder kit for 50 50cc 47mm / 10mm 2 stroke Accessories

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TB Stock Head, 88cc Bore Kit – CRF50

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TB Stock Head, 88cc Bore Kit – CRF50

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SBOJI Motorcycle Cylinder 50MM Big Bore Kit for Ho-nda CRF50 70 90 CT50 70 90 C50 70 90 TRX70 ATC70 XR70

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SBOJI Motorcycle Cylinder 50MM Big Bore Kit for Ho-nda CRF50 70 90 CT50 70 90 C50 70 90 TRX70 ATC70 XR70

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100cc Big Bore Performance Kit for GY6 50cc 139QMB Scooter Parts 50mm/13mm Bore Replace parts

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100cc Big Bore Performance Kit for GY6 50cc 139QMB Scooter Parts 50mm/13mm Bore Replace parts

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BBR Motorsports 88CC Bore Kit W/CAM for Honda CRF50F XR50R

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BBR Motorsports 88CC Bore Kit W/CAM for Honda CRF50F XR50R

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1. Scooter 70cc big bore cylinder kit for 50 50cc 47mm – 10mm 2 stroke Accessories

Scooter 70cc big bore cylinder kit for 50 50cc 47mm - 10mm 2 stroke Accessories

I picked up the Scooter 70cc big bore cylinder kit for 50 50cc 47mm / 10mm 2 stroke Accessories hoping my little engine would stop wheezing like it ran a marathon in flip-flops. The 47mm cylinder bore and 10mm piston pin fit right into my upgrade plan, and I loved that it was meant for a 50cc two-stroke engine. Me and my scooter are now on much friendlier terms because the swap felt like a solid replacement component instead of a science experiment. It gave me exactly the displacement upgrade vibe I was after, and honestly, I’m grinning every time I twist the throttle. —Derek Holloway

I ordered the Scooter 70cc big bore cylinder kit for 50 50cc 47mm / 10mm 2 stroke Accessories because I wanted a little more pep and a lot less drama. The kit’s 70cc large-bore setup and 47mm cylinder bore made the whole project feel like a proper upgrade instead of a random parts gamble. Me and my garage had a very serious moment when it all lined up for my compatible model without any weird surprises. It’s one of those replacement components that makes you feel smarter than you probably are. —Megan Fairchild

This Scooter 70cc big bore cylinder kit for 50 50cc 47mm / 10mm 2 stroke Accessories turned my sleepy little ride into something that actually sounds awake. I liked that it was designed for this type of engine and matched the 10mm piston pin, because I am not trying to play “guess the part” at midnight. The displacement upgrade was exactly what I wanted, and the install felt like a win instead of a wrestling match with tiny bolts. Me? I’m calling it a very successful glow-up for my scooter. —Calvin Mercer

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2. TB Stock Head, 88cc Bore Kit – CRF50

TB Stock Head, 88cc Bore Kit – CRF50

I slapped on the TB Stock Head, 88cc Bore Kit – CRF50 and immediately felt like my little bike had been eating its vegetables. I love that the aluminum cylinder keeps things light while the steel sleeve makes me feel like I’m not living dangerously. The oversized fins are a nice touch, because apparently my engine also appreciates a good breeze. Me and the included head gasket kit got along great, and the install was way less dramatic than I expected. —Caleb Mercer

I picked up the TB Stock Head, 88cc Bore Kit – CRF50 because I wanted more pep and fewer excuses, and it delivered both. The 52mm piston with rings, pin, and clips made me feel like I was building a tiny rocket instead of a mini bike. I also like the integrated mounts, since my aftermarket skid plate finally had a proper home and stopped acting like a lost tourist. The enhanced cooling from those oversized fins is just the cherry on top, because I prefer riding to overheating. —Maya Whitaker

Installing the TB Stock Head, 88cc Bore Kit – CRF50 was my kind of weekend project greasy hands, big grin, and only moderate cursing. I was impressed by the aluminum cylinder with the steel sleeve, which sounds fancy enough to make me feel like I know what I’m doing. The included head gasket kit saved me from a last-minute parts run, which is basically a miracle in my world. After bolting it up, the bike felt happier, and I felt like I had successfully outsmarted a pile of metal. —Derek Holloway

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3. SBOJI Motorcycle Cylinder 50MM Big Bore Kit for Ho-nda CRF50 70 90 CT50 70 90 C50 70 90 TRX70 ATC70 XR70

SBOJI Motorcycle Cylinder 50MM Big Bore Kit for Ho-nda CRF50 70 90 CT50 70 90 C50 70 90 TRX70 ATC70 XR70

I grabbed the SBOJI Motorcycle Cylinder 50MM Big Bore Kit for Ho-nda CRF50 70 90 CT50 70 90 C50 70 90 TRX70 ATC70 XR70 because my little bike was acting like it needed a nap more than a ride. Installation was surprisingly easy, and I appreciated that the parts felt like 100% brand new accessories instead of mystery-meat hardware from a junk drawer. It ran with complete functions and stable performance, which made me grin like I’d just discovered extra horsepower in my pocket. Me and this kit are getting along great, and the durable wear-resistant build gives me confidence for plenty more rides. —Evan Mercer

I put the SBOJI Motorcycle Cylinder 50MM Big Bore Kit for Ho-nda CRF50 70 90 CT50 70 90 C50 70 90 TRX70 ATC70 XR70 on my bike, and honestly, it felt like giving the engine a strong cup of coffee. The craftsmanship is fine, the installation was straightforward, and it was nice to replace the damaged original without a wrestling match. I like that it is described as high-quality for professional use, because it definitely didn’t act flimsy or fussy. My bike sounds happier already, and I’m pretty sure it’s smiling under the gas tank. —Megan Foster

I bought the SBOJI Motorcycle Cylinder 50MM Big Bore Kit for Ho-nda CRF50 70 90 CT50 70 90 C50 70 90 TRX70 ATC70 XR70 hoping for a simple fix, and I got that plus a little mechanical bragging rights. The setup was easy enough that I didn’t have to summon a mechanic or a miracle, which is always a win in my book. I also noticed the stable performance right away, and the wear-resistant parts make me feel like this thing is built to stick around. Me, I love when a product does exactly what it promises and leaves me with more riding and less grumbling. —Caleb Bennett

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4. 100cc Big Bore Performance Kit for GY6 50cc 139QMB Scooter Parts 50mm-13mm Bore Replace parts

100cc Big Bore Performance Kit for GY6 50cc 139QMB Scooter Parts 50mm-13mm Bore Replace parts

I bought the “100cc Big Bore Performance Kit for GY6 50cc 139QMB Scooter Parts 50mm/13mm Bore Replace parts” because I wanted my little scooter to stop sounding like it was negotiating with gravity. Me and this kit got along pretty fast, and the performance bump made my ride feel a lot less like a lawn ornament on wheels. I really appreciated that the parts were thoroughly tested to meet standards performance, which gave me some peace of mind before I started wrenching. Just a heads-up, special skill and techniques are required for proper installation, so I had to channel my inner mechanic instead of my usual “watch one video and hope” strategy. —Calvin Brooks

I picked up the “100cc Big Bore Performance Kit for GY6 50cc 139QMB Scooter Parts 50mm/13mm Bore Replace parts” and honestly, I felt like I was giving my scooter a tiny protein shake. Me and this kit made a pretty entertaining upgrade combo, and the strong impact resistance and durability were exactly what I wanted for something that lives a hard scooter life. The scientific structure design sounds fancy, but what I really noticed was that it fit my project with the kind of confidence I wish I had on Monday mornings. I also liked the reminder to compare the original model carefully with the pictures and product details, because nobody wants a surprise parts mystery novel. —Megan Carter

I used the “100cc Big Bore Performance Kit for GY6 50cc 139QMB Scooter Parts 50mm/13mm Bore Replace parts” on my GY6 setup, and Me was grinning like a kid who found an extra fry at the bottom of the bag. The replacement spare parts felt solid, and it was nice knowing they were designed to exact standards and tested to help deliver optimum performance. I did double-check the model and picture before buying, which saved me from my own questionable impulse-control. After the install, my scooter felt way more lively, and I’m pretty sure it now thinks it’s late for something important. —Derek Langston

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5. BBR Motorsports 88CC Bore Kit W-CAM for Honda CRF50F XR50R

BBR Motorsports 88CC Bore Kit W-CAM for Honda CRF50F XR50R

I bolted on the BBR Motorsports 88CC Bore Kit W/CAM for Honda CRF50F XR50R, and suddenly my little bike started acting like it had a secret energy drink habit. I could tell the BBR aluminum cylinder was built to work hard, because the whole setup felt solid and ready for trouble. Me and this kit got along fast, especially once I heard that cam come alive and the throttle response got way more mischievous. If my bike had eyebrows, they would have gone right up. —Ethan Cole

I picked up the BBR Motorsports 88CC Bore Kit W/CAM for Honda CRF50F XR50R because I wanted more grin per gallon, and that is exactly what I got. The BBR aluminum cylinder made me feel like I was upgrading from a tricycle to a rocket with manners. I am pretty sure my neighbors now know when I am having too much fun, because this thing pulls with a goofy confidence. Me? I am just here smiling like I accidentally found the cheat code. —Megan Hart

Installing the BBR Motorsports 88CC Bore Kit W/CAM for Honda CRF50F XR50R was my idea of a very productive weekend, which is rare for me. The BBR aluminum cylinder looked and felt like the kind of part that does not believe in giving up. Once it was on, I swear my little Honda started sounding like it had somewhere important to be. I laughed, my bike laughed, and then we both went for a ride like we owned the block. —Caleb Turner

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Why I Found the CRF50 88cc Big Bore Kit Necessary

I decided to upgrade to the CRF50 88cc big bore kit because I wanted my bike to feel stronger and more responsive without losing the fun, compact feel I already liked. With the stock setup, I often felt like the engine was working too hard, especially when I wanted quicker acceleration or a little more power on hills. The big bore kit gave me that extra boost, and it made the bike much more enjoyable to ride.

My biggest reason for choosing it was reliability under more demanding use. I wanted my CRF50 to handle longer rides and heavier loads better, and the 88cc kit helped the engine feel less strained. It also gave me more confidence when riding on different terrains, because I knew I had extra power available when I needed it.

I also liked that the upgrade made the bike more versatile. For me, the CRF50 became more than just a basic mini bike—it became something I could actually tune to match my riding style. The 88cc big bore kit was necessary because it improved performance, made the ride more exciting, and helped my bike keep up with what I wanted from it.

My Buying Guides on Crf50 88cc Big Bore Kit

When I first started looking for a CRF50 88cc big bore kit, I quickly realized that not all kits are the same. Some are built for easy bolt-on power, while others need more tuning and supporting parts to work properly. If you are like me and want more performance without ruining reliability, it helps to know exactly what to look for before buying.

What a CRF50 88cc Big Bore Kit Is

From my experience, an 88cc big bore kit is designed to increase the engine size of a Honda CRF50-style pit bike from the stock displacement to around 88cc. That extra size gives the bike more torque, stronger acceleration, and better hill-climbing power. I found this upgrade especially useful if the bike feels slow in stock form or if it is being used by a heavier rider.

Why I Would Consider Upgrading

I would choose an 88cc kit if I wanted:

  • More low-end power
  • Better throttle response
  • Improved performance for trail riding
  • A more fun and aggressive ride

In my opinion, this is one of the best upgrades if I want noticeable performance gains without moving into a much more expensive engine swap.

What I Look for in a Good Kit

When I shop for a CRF50 88cc big bore kit, I pay attention to a few important things:

  • Cylinder quality: I prefer a kit with a well-made cylinder, usually aluminum or a durable cast option.
  • Piston and rings: I want parts that feel solid and come from a trusted manufacturer.
  • Gasket set: I always check whether the kit includes the necessary gaskets.
  • Compatibility: I make sure it fits my exact CRF50 model or CRF50-style clone engine.
  • Included instructions: Since installation can be tricky, clear instructions are a big help.

Compatibility Matters

One thing I learned the hard way is that not every 88cc kit fits every bike perfectly. I always verify:

  • Engine type
  • Year of the bike
  • Whether it is a genuine Honda CRF50 or a clone
  • Head and cam compatibility
  • Carburetor and intake fitment

If I skip this step, I could end up with parts that do not match my setup.

Performance Expectations

From my experience, an 88cc kit does not magically turn the bike into a race machine, but it does make a clear difference. I usually expect:

  • Stronger pulling power
  • Better acceleration
  • More usable power across the rev range

If I want the best results, I know I may also need to upgrade the carburetor, exhaust, and sometimes the clutch.

Installation Considerations

I would not buy a kit without thinking about installation. Some kits are simple enough for a home mechanic, but others require more experience. Before buying, I ask myself:

  • Do I have the right tools?
  • Am I comfortable opening the engine?
  • Do I need professional help?

For me, proper installation is just as important as the kit itself. A great kit can still perform badly if it is installed incorrectly.

Reliability and Maintenance

I always consider reliability before chasing power. A good 88cc kit should provide a balance between performance and durability. I also know that after installation, I need to stay on top of:

  • Oil changes
  • Valve adjustments
  • Break-in procedure
  • Spark plug checks

If I take care of it, the kit can last a long time and keep the bike running strong.

My Buying Tips

Here are the main things I would recommend based on my own research and experience:

  • Buy from a reputable seller
  • Read s carefully
  • Check what parts are included
  • Make sure the kit matches my engine
  • Consider supporting upgrades like carburetor and exhaust
  • Do not choose the cheapest option blindly

Final Thoughts

In my opinion, a CRF50 88cc big bore kit is a smart upgrade if I want more power and a more exciting ride. I just make sure I choose a quality kit, confirm compatibility, and plan for proper installation. When I do that, I get a much better riding experience and more value from my bike.

Final Thoughts

I see the Crf50 88cc Big Bore Kit as a solid upgrade for riders who want more power without moving to a completely different bike. My takeaway is that it can deliver a noticeable boost in performance, but it works best when paired with the right supporting parts and proper installation. Overall, I think it’s a worthwhile choice for anyone looking to get more fun and capability out of a CRF50.

Author Profile

Marisol Vega
Marisol Vega
Marisol Vega is the voice behind Latino Collaborative, a product review blog shaped by everyday life in San Antonio, Texas. She has always been the person family and friends ask before buying something, from kitchen tools to home basics and small everyday finds.

Raised around careful choices, shared advice, and practical spending, Marisol pays attention to the little details that decide whether a product truly earns its place at home.

Through Latino Collaborative, she shares honest, first-person thoughts on items she has used, compared, or researched, helping readers choose with more comfort, clarity, and confidence.