SP/DR 400 intake port

Suzuki DR 400 discussion forum:


SP/DR 400 intake port

SP/DR 400 intake port 
Phil Guzman said 2008-02-07 03:09 
 
I am in the process of putting together a playbike using a couple of SP/DR 400 engines. I notice that these engines have a ridge running across the bottom of the intake port, at the carburetor end of the port. Does anyone know what it was intended to do?? Any comments will be appreciated!
Regards, Phil 
 
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