Originally Posted by HeadTrauma
There are ways to scab together adapters, but it's all likely to perform worse than either OEM setup.
If the Adapter is well made then its most of the Time the new Engine or the Carbs are not correct ajust that make the power worse .
Air flow over two seperate Intake Ports is different to the Airflow over 1 Split type Port .
Carbs need to ajust for that .
Honda XL 600 R(S) 84 , Honda XR 600 Dual Carb. 87
Honda XR 280 R Sumo 04 , Honda XR 250 Baja 98
Yamaha Speed MX ( 2 Stroke ) 01 ,CRF250L 13