In addition to the front driver pulley, the rear driver pulley can also be recalibrated with different clutch shoe springs to vary clutch engagement RPM, and also the main driven compression spring can be changed to a stiffer spring which also effectively boosts engine RPM under driving conditions. Weigh your stock weights using a precision scale and select new rollers weights either lighter or heavier - depending how you want to change your engine RPM range. Lighter scooters may want to have a little heavier roller weights. Somewhere around 10-12 grams would probably be a good starter experiment for heavier go karts. Roller weights can be found for the 150cc GY6 in the range of probably 8 - 15 grams or so. Heavier roller weights decrease engine RPM. Lighter roller weights will increase overall engine RPM. The front driver pulley (variator) can be recalibrated with different roller weights to vary to overall RPM of the engine under driving conditions. A properly calibrated CVT can significantly increase the overall performance.
CG ENGINE VS GY6 ENGINE MOD
Most mod kits for gas scooters will also come with new parts for the CVT. Recalibrating your CVT modification will not increase the actual power output, but it has a high performance-to-cost ratio. Recalibrate your CVT (Continuously Variable Transmission). With that idea in mind, let's look at some ways that the performance of scooter engines can be increased. More air flow along with the appropriate amount of fuel will result in more power producing potential. Increasing air flow through an engine is the goal. These compromises usually limit efficiency and performance potential of an engine. This is true of just about any mass produced engine which have compromises that are driven because of manufacturing restraints like time and cost.
The GY6 based engine found in these scooters and go karts is like most any other internal combustion engine - in that it can benefit from some well directed modifications. Of course, more power would always be nice, but considering the small displacement of this GY6 based 150cc engine, it really is impressive.Įven so, mod kits for gas scooters and go karts are available, and other modifications can be made to increase performance further. It is surprising how well of a job a small 150cc engine can do at moving an adult around on a scooter or even a heavy go kart.
The GY6 engine with CVT (continuously variable transmission) has decent performance for it's small 150cc engine displacement. There are different specific engine designs used on these go karts and scooters, but the principles on this page will also apply to many different engines.Ī lot of scooters and go karts are powered by a 150cc engine based on the Honda GY6 scooter engine design. This page will look at ways to modify and increase the performance of gas scooter engines, which are now being used in go-karts.
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