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How The Air Box Works |
From time to time the question is asked "Can I just drill some holes in my air box to increase the air flow?"
The answer, in short, is no. Here's why.
Click on a thumbnail to enlarge.
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The key to this answer is understanding the path of air flow with the stock box. This picture above the rear of the air box where the air intake snorkel is located. Air enters the snorkel and passes into the inner surface of the air filter inside the air box. |
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This picture shows the inside of the air box. The air that has entered the snorkel and entered the inner surface of the filter, exits the filter through it's outer surface and into the air box. It then is sucked up the carb air intake opening to be mixed with fuel and passed into the cylinders. |
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Based upon this air flow design, any holes drilled into the air box, or the cover, would allow unfiltered air to be passed directly into the carb air intake and into the cylinders. Unfiltered air can contain many small particles of material that can scratch, or score, the cylinder walls. Such damage to the cylinder walls can cause loss of compression as air can escape from the compression chamber. Oil can also leak past the piston and into the compression chamber. Neither of these is a good thing! The only thing that can be done with the stock air box is to remove the air intake snorkel from the rear of the air box. However, even rejetted with 106 and 110 Dynojet jets, so much air is passed into the intake that the bike will not accept throttle. This amount of airflow would require rejetting with larger main jets. So far, no one I am aware of has removed the snorkel and rejetted to accommodate the high airflow. Until now! Forum member BEAN210 went from this previously discussed concept, pulled the snorkel, installed the newly available K&N filter for the stock box, and rejetted with 124 & 128 main jets, available from Dynojet for a few bucks each. Here is the thread in which he talks about the result, and the first thread in which he considered doing this. snorkel mod-Thank you Blacktop! just finished the mixture screw adj. And his report on final results: final snorkel mod results are in And finally, his Stock Air Box Mod Page, complete with written instructions and pictures!
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