The 11 Best Fourtrax 300 Big Bore Kits (2022 reviews)

The Rutu Fourtrax 300 Big Bore Kit is long-lasting, rigid and fits well with your daily purpose like a dream. The rutu fourtrax 300 big bore kit is good for cylinder head and it is perfect for high quality. This is one of the best upgrades you can make to your 50cc scooter. In addition, this is great for intake manifold and it comes with an oil pump.

Above all, the rutu fourtrax 300 big bore kit works great and there is much more.

Most customers found that the kit comes in 64mm n 69mm for 50cc, digital caliper is also available on amazon. Further, they also found that the kit fits a 49cc w/gy6 style engine.

Top Customer Quotes:

We have 2 versions, 64mm and 69mm valve length version.s Please confirm before ordering.
This will work for your bike.
This is the perfect first install.
This is one of the best upgrades you can make to your 50cc scooter.

Best For Great Price: Bbr Motorsports Fourtrax 300 Big Bore Kit

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The Bbr Motorsports Fourtrax 300 Big Bore Kit's superior materials makes sure that it ages well with use. The bbr motorsports fourtrax 300 big bore kit is ready to ship and it is built with great instructions. 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 made for air filter, is great with basic mechanics and it is easy to install.

The kit is fitment and it is used for torque specs. Finally, the bbr motorsports fourtrax 300 big bore kit is reliable, is great for a great price and it is designed for easy install.

Almost all buyers found that the kit has awesome customer service and also it is obviously not going to work for you. In addition, a few also found that the kit would only work on the xr100 and crf100 bikes. In addition, they also found that this is the kit to get for easy bolt on power. In short, buyers found this to be one of the best kits for daily purposes.

Top Customer Quotes:

One of the newcomers and featured product.
Good investment for the long term.

RELATED: Best 170 Cc Big Bore Kits

Best With Thread Lock: Top Notch Parts Fourtrax 300 Big Bore Kit

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The Top Notch Parts Fourtrax 300 Big Bore Kit's high-end materials make sure that it ages well with use. The top notch parts fourtrax 300 big bore kit has a ceramic coating providing superior heat resistance which will extend the life span of the piston. The manufacturer says: We ship directly from the USA, not like some sellers who say they do but don't. Further, this is used for fuel filtering and it fits with a thread lock. Lastly, the top - notch parts fourtrax 300 big bore kit looks good, is used for best quality and it comes with a gasket maker.

Almost all customers opine that the kit is easy to rebuild and parts are available everywhere. Moreover, a few also found that the kit is perfectly and fast delivered. Further, they also found that the kit is cheaper than anywhere else. In short, buyers found this to be one of the best kits for daily purposes.

Why We Like This:

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.
Parts fit: 1999 - 2008 honda trx 400ex.
New and hot releases.

RELATED: Best Big Bore Gasket Kits

Best With Part Number: Usonline911 Fourtrax 300 Big Bore Kit

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If you are currently in the market looking for a suitable kit for your daily use, the Usonline911 Fourtrax 300 Big Bore Kit is the natural choice. The usonline911 fourtrax 300 big bore kit is fitment and it has improved engine displacement. Make sure this fits by entering your model number. Also, this is expanded from 74mm to 80mm, and the displacement is increased from 282cc to 330cc. Above all, the usonline911 fourtrax 300 big bore kit is a brand new cylinder gasket rings kit for your honda sportrax trx300ex 1993.

Why We Like This:

Improve engine displacement and performance!! Increase 12-15% horsepower and torque!! !.
Lot of satisfied buyers.

Best For Direct Replacement: Niche Fourtrax 300 Big Bore Kit

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The Niche Fourtrax 300 Big Bore Kit's superior materials make sure that it ages well with use. The niche fourtrax 300big bore kit includes cylinder, piston, rings, wristpin, circlips, head gasket, base gasket, o-ring. Make sure this fits by entering your model number. Moreover, it is a direct replacement for your own components. Lastly, the niche fourtrax 300 big bore kit includes a chain tensioner gasket and spark plug.

One customer says - "Getting the right parts when you order. ". Almost all buyers quickly discovered that the kit would fit the trx250x machine. Overall, many buyers have used the niche fourtrax300 bigbore kit for more than a few months without any issues, and it shows no sign of giving up.

Why We Like This:

Compatible with the 1993-2008 honda sportrax 300 trx300ex, 2009 honda trx300x.
Replaces part numbers: honda 12100-hm3-l00, 12100-hm3-670,13101-hm3-670, 13011-hm3-671,13111-hc0-000, 94601-17000,12251-hc0-013, 12251-hc0-003,12191-hm3-670, 12191-hc0-000,12191-hc0-306.
74mm x 65.50mm bore and stroke, 8.9:1 compression ratio.

Best For Fast Delivery: Sinocmp Fourtrax 300 Big Bore Kit

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The Sinocmp Fourtrax 300 Big Bore Kit gives the top-tier kit a run for their money by offering flagship specs at a much more affordable price. Further, this is used for o-rings and it comes with a gasket maker. Sinocmp will try to assist you with your needs. Lastly, the sinocmp fourtrax 300 big borekit is great for cylinder head and it has replaced part number.

Why We Like This:

Replace part number: 12000-hc4-000, 12100-hc4-000; bore size: std 74.00mm.
Engine number: honda 1988-2000 trx 300 fourtrax fw 4x4 2x4 aftermarket parts.
One of the newcomers and featured product.

Best For Customer Service: Pangolin Fourtrax 300 Big Bore Kit

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The Pangolin Fourtrax 300 Big Bore Kit's superior materials make sure that it ages well with use. The pangolin fourtrax 300 big bore kit is best for o-rings and it is great with great customer service. Your order (us ca au) will be shipped by dhl, fedex, ups, tnt or ems within hours. These charges are the buyer's responsibility. Finally, the pangolin fourtrax 300 big bore kit is good for cylinder head and it comes with a gasket maker.

Why We Like This:

Manufacturer says: we offer return or exchange service in the warranty.
Replacepart number: 12000-hc4-000, 12100-hc4-000; bore size: std 74.00mm.
Part name: trx300 trx 300 top end rebuild kit.
Before you bid, please confirm your model number and part number.

Best For Head Cover Gasket: Mallofusa Fourtrax 300 Big Bore Kit

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If you want nothing but a kit that is suitable, this Mallofusa Fourtrax 300 Big Bore Kit is certainly a wise investment. The mallofusa fourtrax 300 big bore kit is for the utility model with the rack on the front and the back, not the race model atvs. This kit includes everything you need to swap out your old cylinder and piston to get your machine running like new again. This cylinder piston top end kit has been honed, and comes ready to assemble. Finally, the mallofusa fourtrax 300big bore kit is easy to assemble and it is fitment.

Almost all customers found that the kit was not for a 1987 honda trx250x.

Why We Like This:

Complete standard - sized cylinder and piston kit with gaskets, cylinder 8650mm bore, 99.
Delivers what they promise.

Best For Big Bore Cylinder: Waverspeed Fourtrax 300 Big Bore Kit

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Compared with other kit in this category, the Waverspeed Fourtrax 300 Big Bore Kit has a convenient design. The waverspeed fourtrax300 big borekit is pre-honed and ready to drop in, no modifications required * high-compression hardened aluminum piston kit. Please compare your parts against pictures to ensure this part fits your vehicle. * Please confirm your old part number matches up with one of the part numbers listed above * no instruction included and professional installation recommended. Further, it is made of high-strength material, can withstand high temperature,sssss high pressure and corrosion for a longer life. Finally, the waverspeed fourtrax 300 bigbore kit is good for premium quality and has an excellent design.

"Considering it ’s about 400 dollars cheaper than the name brand. " - says, one customer. To sum up, most buyers found the kit suited best, and no one questions it.

Why We Like This:

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.

Best For High Quality Materials: N\A Fourtrax 300 Big Bore Kit

$N\A Fourtrax 300 Big Bore Kit$

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If you often find yourself confused about convenient and suitable kit, N\A Fourtrax 300 Big Bore Kit should be your first option for buying. The n\a fourtrax 300 big bore kit includes a new piston, piston rings, wrist pin and two circlips a new full top end gasket kit, a new spark plug and a filter fit following vehicles. Make sure this fits by entering your model number. And, the kit is perfect for high quality materials and it is perfect for surface finish.

Above all, the n\a fourtrax 300 big bore kit can get a new quality honed cylinder with a new shindy brand stock size (74.00mm) piston kit.

Why We Like This:

This works for item description and it is great for high quality.
Delivers what they promise.

Best For Spark Plug: Labwork Fourtrax 300 Big Bore Kit

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If you often find yourself confused about convenient and suitable kit, Labwork Fourtrax 300 Big Bore Kit is your end point. The labwork fourtrax 300 big bore kit is coated with a thread lock and it comes with a gasket maker. Make sure this fits by entering your model number. Moreover, it has a ceramic coating providing superior heat resistance which will extend the life span of the piston. Most importantly, the labwork fourtrax 300 big bore kit is ideal for fuel filtering and it works well for oil filter.

Why We Like This:

1X head gasket. 1X base gasket. 1X head cover gasket. 1X chain tensioner gasket.
New and hot releases.