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4-Stroke Engine Kits

Customers love the longevity and durability of the Grubee 49cc 4G-TBelt Drive Complete Gas Powered Engine Kit! There is no need to mix oil and gas!

Don’t be led astray by inferior quality engine kits! Grubee products are produced to last and are one of the only EPA certified engine kits on the market today!

These engine kits come complete and ready to install on any 26” Men’s Bicycle that has a frame section that measures 8.5” wide x 9” tall.

The 4G-TBelt Drive Transmission offers a quiet ride with a belt that is easy to replace after hours of riding time.

Cruise around town at 35mph while maintaining 150mpg average. The new 49cc 4G T Belt Drive bicycle engine kit is perfect for a long urban commute or nice ride in the country. 4 Stroke engines are much easier to maintain and quieter than 2 Stroke engines.

Be sure to look at our upgrades and accessories to make the most out of your engine kit!

The website features various areas of expertise including a hints and solutions section as well as downloadable instruction manuals.

If you are unable to find the information that you need to get your Motorized Bicycle on the road then please feel free to call us here at Birddog Distributing, Inc. 406-586-5970 and we will do our best to help you out!

4-Stroke 49cc Bike Builds

4-stroke engine kit builds