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BBR Tuning Racing Series Stage 4 66/80cc 2-Stroke Engine Kit Item# BBR-STAGE4-KIT

SALE Price: $239.95
List Price: $349.95

66/80cc BBR Tuning Racing Series: Stage 4 Engine Kit Package

When you’re in need of an engine with some serious power, the BBR Tuning Stage 4 Performance Engine Kit is the engine kit for you. With this performance package you’ll get everything you need to get tons of power, from top end speed to bottom end torque. Outfitted with an Expansion Chamber for a smooth ride, an NGK spark plug and Stage 1 CDI for a much better spark, a high performance head for major compression, and a high performance carburetor for optimum speed, you’ve got a motor that’s ready to perform and more importantly, a motor that’ll last.

Compression of a Performance Motor with the Carburetor to Back it Up

With the BBR Tuning High Performance head leading the way, this engine will give you more compression than ever. More compression means an increase in speed and pulling power, so not only will you go faster but those hills and inclines won’t give you a problem anymore. And if that wasn’t good enough, its tall heat syncs let your engine cool faster, letting your ride longer than ever.

Add to that the High Performance Carburetor, and you’ve got yourself a speed machine. Its bigger jets will give your engine more fuel, and its air filter will let your carburetor breathe better than ever. You’ll definitely need a performance carburetor if you’re looking to run a high performance head, and we made sure that this BBR Tuning package had that standard.

The Smoothest Running Engine You’ve Ever Felt

With an Expansion Chamber on this motor you can count on a smooth ride. Ever wonder why it feels so rough when you ride? That’s partially because the stock muffler restricts airflow coming out of your engine, and if you’re using performance parts you’ll need something that won’t limit your motor from expelling all that exhaust it creates.

Enter the Expansion Chamber. With no baffle in the chamber there’s nothing limiting air flow except at the exhaust port. However, the banana shape of this muffler helps circulate air around the chamber so that instead of a large amount of smoke trying to go through a small hole, there’s a smooth flow of air coming from the chamber itself. Not only will you get a little bit of torque of this muffler, you’ll get a smoother ride, too.

The Spark Plug Dream Team Included

What would a performance engine be without a high quality CDI? If you’re giving your engine more fuel it needs a better spark than your stock CDI will give it. The Stage 1 CDI included with this package was made for performance, with its high performance wire that offers you better connectivity than ever and a high quality Japanese NGK spark plug cap.

Standard spark plugs can’t handle all that performance quite well, so we paired this CDI with an NGK B5HS spark plug that’ll give you the best, most consistent spark you’ve gotten out for your engine in quite some time.


Product Details


The BBR Tuning 66/80cc bike engine kit is about 8.5" height 7" length 5" width. The bike engine kit fits on standard, male frames with tubing of 25mm to 29mm in diameter. Larger frame sizes require drilling into bike frame with a stationary bolt and use the universal face plate to mount the front of the engine.


2.75+ HP (horse power)


25 to 40 mph depending on the gear ratio and weight


Fuel Economy: 100-125 miles per gallon


Product Requirements


Installation is a breeze! The rider only needs some basic hardware skills, tools, and around 2-3 hours for installation and fine tuning adjustments (Note: Seller is not responsible for misuse or this kit or any warranty after installation).


Fits Most 26" Wheeled Bikes (Mountain, Cruiser, Chopper, Road) with V-frame. The frame should have 9-11” of clearance between the bottom bracket and top bar, and the diameter of the frame tubes should be 25-29mm (around an 1”).


Package Includes:


  1. Silver BBR Tuning 66/80cc 2-Stroke Engine
  2. Bonus- BBR Tuning Billet Aluminum High Performance Cylinder Head 66/80cc
  3. Bonus - 66/80cc High Performance Carburetor
  4. Bonus – Expansion Chamber
  5. Bonus - Stage I Performance CDI Electron Ignition Coil (w/ NGK Spark Plug Cap and upgraded CDI cable)
  6. Bonus - NGK B5HS Spark Plug
  7. Complete Clutch Cable Assembly with Clutch Wire Clip
  8. Drive Chain Idler Pulley
  9. Top Quality Japanese 202 Main Bearings
  10. 415 Bike Engine Drive Chain
  11. Drive Chain Guard
  12. 2-Stroke Spark Plug
  13. Locking Alloy Clutch Lever
  14. Upgraded Twist Throttle and Cable With Grip
  15. Updated 1.5L Black Teardrop Gas Tank (approx. ⅖ of a gallon)
  16. Fuel Line
  17. Throttle Cable
  18. Gasoline Tank Switch
  19. Sprocket Clamp Assembly
  20. 44 Tooth Chrome Drive Sprocket with 9 Holes
  21. Large Spring (Heat Shield Spring)
  22. Extension Spring (Recoil Spring)
  23. High Quality Japanese Bearings on Both Ends of Crank
  24. Required Hardware and Gaskets
  25. Magneto
  26. Kill Switch
  27. Spark Plug Removal Tool (While Supplies Last)!
  28. Standard Universal Mounting Bracket

On top of our strict quality assurance measures, we also back our engines with an industry leading 6 month warranty

Disclaimer: Operating a motorized bicycle and/or bicycle engine kit carries a risk of serious bodily injury. The rider accepts responsibility for any and all vehicle operation that may lead to personal injury, economic loss, social distress, other losses, costs and damages. BikeBerry.com is not responsible for injuries and/or damages resulting from operating this motorized bicycle or bicycle engine kit.

 ** Please note: Sprocket Clamp Assemblies included with BBR Tuning 2-Stroke 48cc and 66/80cc, and 4-Stroke 49cc bike engine kits come with only 1x set of metal plates. Older production of these assemblies included 2x sets, but from testing and redesigning, existing engine kits and engine kits in the future will only require 1x set. This redesigned assembly helps secure your rear wheel sprocket better than in previous production.

Disclosure of accurate engine size: While we have chosen to use the long standing factory branding engine size of "80cc", the true displacement of the bicycle engine is 66cc. Down through the years China bicycle engine manufactures have advertised their biggest engine as 80cc, therefore we have listed them in the same way on our website. However, the bore and stroke of an 80cc being 47x38mm equals 66cc. Therefore the true displacement of the 80cc bike motor is 66cc. In the west, the volume of a cylinder is calculated by using the formula Volume = Pi x Radius Squared x Stroke. However, in the east the displacement of an engine includes the area of the cylinder head's combustion chamber as well as the volume of the cylinder. Therein lies a discrepancy between measuring standards by the manufactures in China with those in the United States. However, all "80cc" engine kits on the market today are actually 66cc in displacement size if measuring by US standards.

Best Price Guarantee

BikeBerry.com is committed to providing our customers with the best price available online! At BikeBerry.com we work hard to offer the most competitive pricing available, but if you find a lower price online, let us know and we'll match it! In fact, if you find a lower price within 30 days of your original purchase date, we'll refund you the difference.

Complete the Best Price Guarantee form below to request a quote or price difference refund.

Best Price Guarantee Terms and Conditions:

Item must be the identical model from an authorized U.S. dealer. Specifically, the product must have the same U.S. manufacturer's warranty, model number, and contain the same components. BikeBerry.com will price match only in-stock products.

BikeBerry.com reserves the right to verify another online company's product availability and price before issuing a price match.

BikeBerry.com does not match auction websites or refurbished products.

The Best Price Guarantee does not apply to obvious pricing errors or clearance/close-out items.

Best Price Guarantee applies to the total purchase price of the item. Total purchase price includes shipping, taxes, or other discounts.

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