It is important to have the best xr600r big bore kit. We are here to help you choose the best one for your needs from all the best available products in market today.

Our review process: Show/Hide

Our Top Picks:

Best Overall: Buy: Rutu Xr600R Big Bore Kit READ REVIEW

Best For Great Price: Buy: Bbr Motorsports Xr600R Big Bore Kit READ REVIEW

Best With Thread Lock: Buy: Top Notch Parts Xr600R Big Bore Kit READ REVIEW

Best For Spark Plug: Buy: Weiyingsi Xr600R Big Bore Kit READ REVIEW

Best For Head Cover Gasket: Buy: Niche Xr600R Big Bore Kit READ REVIEW

Best For Air Filter: Buy: 50 Caliber Racing Xr600R Big Bore Kit READ REVIEW

Best For These Engines: Buy: Goofit Xr600R Big Bore Kit READ REVIEW

Best For Direct Replacement: Buy: Gpa Motors Xr600R Big Bore Kit READ REVIEW

Best For Big Bore Cylinder: Buy: Waverspeed Xr600R Big Bore Kit READ REVIEW

Best Overall: Rutu Xr600R Big Bore Kit

Buy on Amazon

Rutu is known for creating practical and outstanding kit for people on the go, and its line of Rutu Xr600R Big Bore Kit definitely falls in line with that reputation. The rutu xr600r big bore kit works great and there is much more. This is one of the best upgrades you can make to your 50cc scooter. Also, it is great for intake manifold and it comes with an oil pump.

Most importantly, the rutu xr600r big bore kit is used for air filter, is built for high performance and it is easy to install.

Most customers found that the kit is a 139qmb engine code, Look for the code below the crankcase cover with the kickstart lever. And, a few strongly agree that the kit will work for your bike.

• This is a gy6 50cc. Yes, it will for sure fit and work great.
• This is good for cylinder heads and it comes with a wrist pin.
• We have 2 versions, 64mm and 69mm valve length version.s Please confirm before ordering.
• This comes in 64mm n 69mm for 50cc, digital caliper is also available on Amazon.

Best For Great Price: Bbr Motorsports Xr600R Big Bore Kit

Buy on Amazon

Not everyone likes to purchase kit for their regular use, but the Bbr Motorsports Xr600R Big Bore Kit would be an anomoly. The bbr motorsports xr600r big bore kit is great for a great price and it is easy to install. Bbr aluminum cylinder, piston, rings, piston pin, clips, performance camshaft, heavy-duty valve springs, rockers with tappet adjusters and gasket kit. In addition, it is great with basic mechanics and it provides you with great instructions.

Finally, the bbr motorsports xr600r big bore kit is made for air filter, comes with piston rings and it is used for torque specs.

Most customers found that the kit is an easy upgrade and can be done in a day if all goes well. In addition, they say that the kit has awesome customer service and also it is obviously not going to work for you. In addition, they also found that this is the kit to get for easy bolt on power. In conclusion, many customers have used the kit for more than a few months without any issues, and it shows no sign of giving up.

• These make no mention of setting the ring end gap for the kit.
• This will only work on the xr100 and crf100 bikes.
• This fits the following applications. Additionally, it is reliable and it is ready to ship.

Best With Thread Lock: Top Notch Parts Xr600R Big Bore Kit

Buy on Amazon

We would, of course, be remiss if we didn't mention Top Notch Parts Xr600R Big Bore Kit for daily use. The top notch parts xr600r big bore kit works well for head cover gasket, comes with a thread lock and it comes with a gasket maker. Make sure this fits by entering your model number. Also, the kit has a ceramic coating providing superior heat resistance which will extend the life span of the piston. Above all, the top notch parts xr600r big bore kit looks good, is used for oil filtering and it is ideal for best quality.

Almost all buyers opine that the kit is easy to rebuild and parts are available everywhere. And, they also found that the kit is perfectly and fast delivered. And, they strongly agree that the kit is cheaper than anywhere else. Without any doubt, this product passed the test and had very satisfied buyers eager to share their experience.

• Parts fit: 1999 - 2008 honda trx 400ex.
• Replaces oem number 12100-kcy-670 12191-kcy-672 13011-kcy-670 13101-kcy-670 90601-ka5-000 13111-kcy-670 12251-hn1-003 12391-kcy-671 14560-kcw-851.
• One of the newcomers and featured product.

Best For Spark Plug: Weiyingsi Xr600R Big Bore Kit

Buy on Amazon

The Weiyingsi Xr600R Big Bore Kit's material feels more premium than its price would suggest. The weiyingsi xr600rbig borekit is used for engine oil and it is safe. Manufacturer says: For fast intake and exhaust we use a high 2-groove hp performance cylinder block and twin-window piston, excellent light-weight brings fast power transfer. Further, it is used for air filter, It works great and it can be bought for good value.

The kit comes with an easy-start-style recoil puller. In addition, the kit is great with pocket rocket and it works with great power. Lastly, the weiyingsi xr600r bigbore kit looks good, fired right up and it is black.

Almost all buyers opine that the kit is, it matters who makes it work. Moreover, they also found that the kit will fit in anything you want if you know how to fabricate and weld.

• This can check for new updates and it is great with great service.
• This is perfect for pocket bike.
• Oil gas mixture: 1:25 max power:2.6hp/7000rpm max torque: 2.8 n.m./5500rpm.
• It is easy to start running great.

Best For Head Cover Gasket: Niche Xr600R Big Bore Kit

Buy on Amazon

The Niche Xr600R Big Bore Kit is satisfactory and appropriate and fits well with your daily purpose. Also, it includes a brand new 89mm cylinder, big bore piston kit, head gasket and base gasket with 2 o-rings. Make sure this fits by entering your model number. Above all, the niche xr600r big bore kit is great for head cover gasket and it comes with a wrist pin.

"If your gonna race of try to drag race this every weekend, you should probably go with a higher quality kit. " - says, one customer. To sum up, many have used the kit for more than a few months without any issues, and it shows no sign of giving up.

• Replaces part numbers: honda 12100-hn1-a70, 12191-kcy-672,13011-kcy-670, 90601-ka5-000,13101-kcy-670, 13111-kcy-670,91301-428-003, 12251-hn1-003,12100-kcy-670, 12100-kcy-670, 12191-kcy-672.
• Includes cylinder (89mm), piston, piston rings, o-rings (2), wristpin and circlips (2).
• Compatible with Honda 1996-2004 xr400r, 1999-2008 sportrax trx400ex, 2009, 2012-2014 trx400x.
• Includes base gasket and head gasket.

Best For Air Filter: 50 Caliber Racing Xr600R Big Bore Kit

Buy on Amazon

If you often find yourself scrambling for convenient and suitable kit, 50 Caliber Racing Xr600R Big Bore Kit should be your first option for buying. In addition, the kit fits many different honda 50/70 pit bikes. Make sure this fits by entering your model number. Lastly, the 50 caliber racing xr600r big bore kit is to be installed by a certified technician* no warranty.

"Unfortunately, this kit will not fit a 1986 honda z50. " - says, one customer. In short, at the price, they believe that they got a steal of a deal with it.

• Cast in mounts on cylinder for aftermarket skid plates.
• Lightweight aluminum cylinder with steel sleeve.
• Oversized cooling fins on cylinder for efficient heat dissipation.
• Main jet kit included.

Best For These Engines: Goofit Xr600R Big Bore Kit

Buy on Amazon

Compared with other kit in this category, the Goofit Xr600R Big Bore Kit has a convenient design. And, the kit makes for super fast shipping and it is made with fast shipping. Make sure this fits by entering your model number. Most importantly, the goofit xr600rbig borekit is fitment and it is great for high quality.

Most buyers agree that the kit is an engine swap with a performance upgrade, replacing a 41.5 cc eton powered "big wheel thunder cobra scooter project. Also, they say that the kit is for any cag style pocketbike. In addition, they say that the kit is best top end for these engines.

• Arrival within 7-15 days (ships from and sold by goofit).
• Fit for 2 stroke 43cc 47cc 49cc 50cc engine(read description for more fitment infos).
• Good investment for the long term.

Best For Direct Replacement: Gpa Motors Xr600R Big Bore Kit

Buy on Amazon

The Gpa Motors Xr600R Big Bore Kit's superior materials make sure that it ages well with use. Moreover, it is always compatible for easy installation. Make sure this fits by entering your model number. Most importantly, the gpa motors xr600r bigbore kit is good for direct replacement and it comes with piston rings.

Most buyers found that the kit fits a yamaha big bear 350.

• The products are direct replacement parts for hassle-free installation.
• The cylinder displacement is 348cc, the compression is 9.2:1.
• Delivers what they promise.

Best For Big Bore Cylinder: Waverspeed Xr600R Big Bore Kit

Buy on Amazon

Not everyone likes to purchase kit for their regular use, but the Waverspeed Xr600R Big Bore Kit would be an anomoly. The waverspeed xr600r big bore kit is pre-honed and ready to drop in, no modifications required * high-compression hardened aluminum piston kit. Make sure this fits by entering your model number. Moreover, it is easy to use, it is good for premium quality and has an excellent design. Lastly, the waverspeed xr600r big bore kit is made of high-strength material, can withstand high temperature,sssss high pressure and corrosion for a longer life. $MERGE_SPACE.

"Considering it ’s about 400 dollars cheaper than the name brand. " - says, one customer. Consequently, buyers were eager to recommend it to friends and families.

• Complete 434cc big bore cylinder piston and gasket kit.
• [Package contents] - cylinder block,piston,piston pin,piston rings,o-ring,head gasket,base gasket,circlips,washers.
• [Part number] - 11191-13e00, 1241-29f00, 12140-29f00, 11210-29f20-0f0, 12111-29f00-0f0, 09160-10082, 11141-29f01, 12151-24f10, 09381-20004.