waxhead
wannabe backflipper
- Location
- gold coast
It is widely recognized that the stock flame arrestor from Yamaha is the most effective for surf conditions. This is primarily because it draws air from the center of the engine bay. When the jet ski experiences rolling or twisting, centrifugal force pushes the water towards the outer edges of the hull.
In 2004, I was involved in the development of a plate designed to be mounted on top of the carburetors, allowing the use of flame arrestor adapters. This setup proved effective with 38mm and 44mm carburetors; however, it caused the engine to run rich when 46mm carburetors were used.
This discrepancy might seem puzzling given that the area of two 46mm diameter carburetors (3322mm²) should be sufficient compared to the front of the OEM flame arrestor, which measures 80mm (5026mm²). The issue arises because the plate positions the adapter higher within the airbox, which impedes airflow.
To address this, we developed a new bottom plate that draws air from the bottom of the OEM airbox as originally designed. However, adapting this solution to larger carburetors presented additional challenges. We explored various clamp devices, but the wide variability in adapter diameters made it difficult to achieve a secure fit. After considerable thought, we designed a separate clamp that applies pressure directly to the adapter without flexing the components.
Additionally, our adapter features a support mechanism that utilizes the fuel pump for added stability. Please refer to the accompanying images for details.
This is the initial version of our solution, and we are open to feedback on any additional features you would like to see.
In 2004, I was involved in the development of a plate designed to be mounted on top of the carburetors, allowing the use of flame arrestor adapters. This setup proved effective with 38mm and 44mm carburetors; however, it caused the engine to run rich when 46mm carburetors were used.
This discrepancy might seem puzzling given that the area of two 46mm diameter carburetors (3322mm²) should be sufficient compared to the front of the OEM flame arrestor, which measures 80mm (5026mm²). The issue arises because the plate positions the adapter higher within the airbox, which impedes airflow.
To address this, we developed a new bottom plate that draws air from the bottom of the OEM airbox as originally designed. However, adapting this solution to larger carburetors presented additional challenges. We explored various clamp devices, but the wide variability in adapter diameters made it difficult to achieve a secure fit. After considerable thought, we designed a separate clamp that applies pressure directly to the adapter without flexing the components.
Additionally, our adapter features a support mechanism that utilizes the fuel pump for added stability. Please refer to the accompanying images for details.
This is the initial version of our solution, and we are open to feedback on any additional features you would like to see.
