Re: 929 Fireblade Standard Exhaust Question
The flapper is part of the blades intake/exhaust system. The other part the HTEV between the headers and midpipe
both are controlled by cable from a servo motor in the left side of the bike under the tank.
The gears inside are plastic and frequently strip causing code 35.
The servo moves at 3k rpm and 8k rpm. The first motion of 90 degrees of the servo at 3k only moves the HTEV to the 'midrange' position to allow a slightly less restrictive exhaust to boost backpressure and thereby midrange power.
At 8k rpm, the HTEV moves 180 degrees to fully open and the flapper is opened to allow increased air flow through the intake.
If the servo isnt working, it is not a big deal to simply safety wire the HTEV open to one of its three positions, however the flapper must be removed in order to prevent 'air starvation' above 8k rpm.
It has been stated that the flapper mod increases low/midrange, however it had already been done on my bike when I bought it so I cant support it.