Active 55 Gas Engines from SDScooters, Active 55 Parts, bigboy Scooter Tuning, bigboy Scooter Mods, Gas Engine Comparisons, Gas Engine Buyers Guide, bigboy Authorized Dealer
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Scooter Engines, goped engines, performance engines

The Active 2-Stroke Engine Is The Most Powerful Scooter Engine Currently Available


Racers This Is The Engine To Get!
Active 55 Gas Engines from SDScooters, Active 55 Parts, bigboy Scooter Tuning, bigboy Scooter Mods, Gas Engine Comparisons, Gas Engine Buyers Guide, bigboy Authorized Dealer
View Performance Chart

It Fits Beast, Bigboy, Bladez, Boxer, PhatBoy, and Viza* Scooters

*Viza - $30.00 Casing Modification Required

 

Stage One Port Job

Stage Two Porting

Stage 3 Port Job*
  Increase Compression
Modify Stock Muffler
Enlarge Exhaust Port
Change Port Timings

designed to greatly increase stock engine power without additional pipe and carb changes
 Stage One Plus
Enlarge Exhaust Port
Modify Transfer Port Timing

hp carb required
additional power achieved with mid to high rpm pipe
 Advanced Version Of Stages One And Two
Recommended As "Race Only" - Very High RPM Modification

requires high rpm tuned pipe
*will significantly affect engine life -increased ring and skirt wear, loss of low rpm power
Your Engine
New Engine w/